the motion does not change the greater the mass, the greater the force necessary
TRANSCRIPT
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FORCE AND MOTION REVIEW
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WHAT HAPPENS TO THE MOTION
OF AN OBJECT WHEN THE
FORCES ARE BALANCED?
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WHAT HAPPENS TO THE MOTION
OF AN OBJECT WHEN THE
FORCES ARE BALANCED?
The motion does not change
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HOW IS AN OBJECT’S MASS
RELATED TO THE FORCE NEEDED TO
ACCELERATE THE OBJECT?
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HOW IS AN OBJECT’S MASS
RELATED TO THE FORCE NEEDED TO
ACCELERATE THE OBJECT?
The greater the mass, the greater the force necessary
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A PERSON PRODUCES THE LEAST FRICTION
ON WHICH SURFACE?
A. CARPET B. ICE C. SAND D. WOOD
FLOOR
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A PERSON PRODUCES THE LEAST FRICTION
ON WHICH SURFACE?
A. CARPET B. ICE C. SAND D. WOOD
FLOOR
Ice
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AIR RESISTANCE IS AN EXAMPLE
OF WHAT?
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AIR RESISTANCE IS AN EXAMPLE
OF WHAT?Friction
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WHAT HAPPENS TO YOUR
GRAVITATIONAL FORCE AS YOU
GROW?
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WHAT HAPPENS TO YOUR
GRAVITATIONAL FORCE AS YOU
GROW?The force increases with the
increased mass.
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WHAT TWO FACTORS AFFECT
THE GRAVITATIONAL
ATTRACTION BETWEEN TWO
OBJECTS?
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WHAT TWO FACTORS AFFECT
THE GRAVITATIONAL
ATTRACTION BETWEEN TWO
OBJECTS?Mass and Distance
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IF YOU APPLY A FORCE ON 1N ON A BOOK TO LIFT IT 2 METERS HIGH, HOW MUCH WORK DID YOU DO?
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IF YOU APPLY A FORCE ON 1N ON A BOOK TO LIFT IT 2 METERS HIGH, HOW MUCH WORK DID YOU DO?
2J
Work = Force x Distance
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WHAT DOES A SIMPLE
MACHINE DO?
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WHAT DOES A SIMPLE
MACHINE DO?Make work easier
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WHICH MACHINE IS A WEDGE?
A. TRUCK RAMP B. AX
C. WHEELBARROW D. DOORKNOB
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WHICH MACHINE IS A WEDGE?
A. TRUCK RAMP B. AX
C. WHEELBARROW D. DOORKNOB
Ax
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WHAT IS THE MECHANICAL
ADVANTAGE OF A WEDGE THAT
REQUIRES AN INPUT FORCE OF 3 N TO
PRODUCE AN OUTPUT OF 9 N?
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WHAT IS THE MECHANICAL
ADVANTAGE OF A WEDGE THAT
REQUIRES AN INPUT FORCE OF 3 N TO
PRODUCE AN OUTPUT OF 9 N?
Mechanical Advantage = Force out divided by Force in
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WHAT IS THE MECHANICAL
ADVANTAGE OF A WEDGE THAT
REQUIRES AN INPUT FORCE OF 3N TO
PRODUCE AN OUTPUT OF 9N?
Mechanical Advantage = Force out divided by Force in.
9N divided by 3N = 3
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A SIMPLE MACHINE CANNOT: A. REDUCE THE AMOUNT OF WORK
THAT IS DONE. B. CHANGE THE DIRECTION OF A
FORCE. C. DECREASE THE INPUT FORCE
NEEDED. D. INCREASE THE DISTANCE OVER WHICH THE FORCE IS EXERTED.
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A SIMPLE MACHINE CANNOT: A. REDUCE THE AMOUNT OF WORK
THAT IS DONE. B. CHANGE THE DIRECTION OF A
FORCE. C. DECREASE THE INPUT FORCE
NEEDED. D. INCREASE THE DISTANCE OVER WHICH THE FORCE IS EXERTED.
A. Reduce the amount of work that Is done.
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WHAT IS THE MECHANICAL
ADVANTAGE OF A WHEEL AND AXLE
THAT REQUIRES AN INPUT FORCE OF
2.5N TO PRODUCE AN OUTPUT FORCE OF
5N?
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WHAT IS THE MECHANICAL
ADVANTAGE OF A WHEEL AND AXLE
THAT REQUIRES AN INPUT FORCE OF
2.5N TO PRODUCE AN OUTPUT FORCE OF
5N?2
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A BABY PUSHES ON A LARGE
CHAIR. WHAT IS THE REACTION
FORCE?
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A BABY PUSHES ON A LARGE
CHAIR. WHAT IS THE REACTION
FORCE?The chair pushes on the baby
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A STUDENT PUSHES ON A LEVER WITH
THE FORCE OF 40N. THE 150-N LOAD
DOES NOT MOVE. WHICH OF THE
FOLLOWING IS TRUE?A. Input force is 40N and work done
is 0J.
B. Input force is 40N and work done is 600J.
C. Output force is 40N and work done is 150J.
D. D. Output force is 150N and work is 40J.
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A STUDENT PUSHES ON A LEVER WITH
THE FORCE OF 40N. THE 150-N LOAD
DOES NOT MOVE. WHICH OF THE
FOLLOWING IS TRUE?A. Input force is 40N and work done is 0J.
B. Input force is 40N and work done is 600J.
C. Output force is 40N and work done is 150J.
D. D. Output force is 150N and work is 40J.
A. Input force is 40N and work done is 0J.
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THE TENDENCY OF AN OBJECT
AT REST TO STAY AT REST IS
WHAT?
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THE TENDENCY OF AN OBJECT
AT REST TO STAY AT REST IS
WHAT?Inertia
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WHAT IS A CHANGE IN
VELOCITY CALLED?
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WHAT IS A CHANGE IN
VELOCITY CALLED?
Acceleration
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A BALL ROLLS A DISTANCE OF 1
METER FOR 2 SECONDS. WHAT IS THE SPEED OF THE
BALL?
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A BALL ROLLS A DISTANCE OF 1
METER FOR 2 SECONDS. WHAT IS THE SPEED OF THE
BALL?0.5 m/s
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A CHILD RIDING ON A CAROUSEL IS CONSTANTLY ACCELERATING.
WHY?
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A CHILD RIDING ON A CAROUSEL IS CONSTANTLY ACCELERATING.
WHY?Because the child is constantly
changing direction!
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WHICH OF THE FOLLOWING
STATEMENTS ABOUT A 1 KG BLOCK OF
METAL FALLING FROM A TOWER IS
FALSE?A. Gravity causes a net downward
force on the block
B. B. Gravitational attraction decreases as the block gets closer to the
ground.
C. C. Gravitational attraction causes the block to accelerate as it falls.
D. D. Gravity causes an unbalanced force on the block.
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WHICH OF THE FOLLOWING
STATEMENTS ABOUT A 1 KG BLOCK OF
METAL FALLING FROM A TOWER IS
FALSE?A. Gravity causes a net downward force
on the block
B. B. Gravitational attraction decreases as the block gets closer to the ground.
C. C. Gravitational attraction causes the block to accelerate as it falls.
D. D. Gravity causes an unbalanced force on the block.
B.
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KINETIC ENERGY =1/2 M V²
A BOWLING BALL WITH A MASS OF 5 KG IS ROLLING AT 2 M/S.
WHAT IS THE KINETIC ENERGY?
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KINETIC ENERGY =1/2 M V²
A BOWLING BALL WITH A MASS OF 5 KG IS ROLLING AT 2 M/S.
WHAT IS THE KINETIC ENERGY?
½ x5 kg x (2 m/s)2
=1/2 x 5kg x 4m/s=1/2 x 20J
=10J
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THE LOCATION OF A PLACE OR
OBJECT IS CALLED?
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THE LOCATION OF A PLACE OR
OBJECT IS CALLED?
Position
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THE CHANGE OF POSITION OVER
TIME IS CALLED?
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THE CHANGE OF POSITION OVER
TIME IS CALLED?Motion
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A PUSH OR A PULL IS
CALLED?
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A PUSH OR A PULL IS
CALLED?A force
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WHEN ONE OBJECT PUSHES ANOTHER
OBJECT BY TOUCHING IT, THE FIRST OBJECT IS
APPLYING A _______
FORCE TO THE SECOND.
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WHEN ONE OBJECT PUSHES ANOTHER
OBJECT BY TOUCHING IT, THE FIRST OBJECT IS
APPLYING A _______
FORCE TO THE SECOND.Contact
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A LOCATION YOU COMPARE
TO OTHER LOCATIONS IS
CALLED?
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A LOCATION YOU COMPARE
TO OTHER LOCATIONS IS
CALLED?Reference Point
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A FORCE OF ATTRACTION
BETWEEN TWO OBJECTS IS
WHAT?
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A FORCE OF ATTRACTION
BETWEEN TWO OBJECTS IS
WHAT?Gravity
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A FORCE THAT RESISTS
MOTION IS CALLED WHAT?
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A FORCE THAT RESISTS
MOTION IS CALLED WHAT?
Friction
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HOW AN OBSERVER SEES
YOUR MOTION DEPENDS ON
HIS OWN MOTION. THIS IS
CALLED WHAT?
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HOW AN OBSERVER SEES
YOUR MOTION DEPENDS ON
HIS OWN MOTION. THIS IS
CALLED WHAT?Relative Motion
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CONSIDERING THE SIZE AND DIRECTION OF ALL FORCES ACTING ON AN OBJECT ALLOWS US TO
PREDICT CHANGES IN MOTION. THE OVERALL FORCE ACTING ON AN
OBJECT WHEN ALL FORCES ARE COMBINED
IS CALLED WHAT?
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CONSIDERING THE SIZE AND DIRECTION OF ALL FORCES ACTING ON AN OBJECT ALLOWS US TO
PREDICT CHANGES IN MOTION. THE OVERALL FORCE ACTING ON AN
OBJECT WHEN ALL FORCES ARE COMBINED
IS CALLED WHAT?Net force
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HOW IS SPEED RELATED TO
DISTANCE AND TIME?
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HOW IS SPEED RELATED TO
DISTANCE AND TIME?
Speed is distance divided by time
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NEWTON’S 2ND LAW STATES
THAT TO INCREASE
ACCELERATION, YOU MUST
A. Increase force
B. Decrease force
C. Increase mass
D. Increase inertia
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NEWTON’S 2ND LAW STATES
THAT TO INCREASE
ACCELERATION, YOU MUST
A. Increase force
B. Decrease force
C. Increase mass
D. Increase inertia
A. Increase force
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A POSITION DESCRIBES AN
OBJECT’S LOCATION
COMPARED TO A…..
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A POSITION DESCRIBES AN
OBJECT’S LOCATION
COMPARED TO A…..
Reference point
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MARIA WALKED 2 KM IN HALF
AN HOUR. WHAT WAS HER AVERAGE
SPEED?
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MARIA WALKED 2 KM IN HALF
AN HOUR. WHAT WAS HER AVERAGE
SPEED?Speed = distance divided by time
4 km/h
Change the “half an hour” to 0.5 hours.
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A VECTOR IS A QUANTITY THAT
HAS WHAT?
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A VECTOR IS A QUANTITY THAT
HAS WHAT?Size and direction
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WHAT UNIT MEASURES
FORCE?
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WHAT UNIT MEASURES
FORCE?Newton
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A MORE MASSIVE MARBLE COLLIDES
WITH A LESS MASSIVE ONE. THE TOTAL MOMENTUM
AFTER COLLISION IS EQUAL TO…….
a. Zero
b. The original momentum of the more massive marble
c. The original momentum of the smaller marble
d. Twice the momentum of the more massive marble
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A MORE MASSIVE MARBLE COLLIDES
WITH A LESS MASSIVE ONE. THE TOTAL MOMENTUM
AFTER COLLISION IS EQUAL TO…….
a. Zero
b. The original momentum of the more massive marble
c. The original momentum of the smaller marble
d. Twice the momentum of the more massive marble
B.
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A CHEETAH CAN GO FROM 0 M/S TO 20 M/S IN 2
SECONDS. WHAT IS THE
CAT’S ACCELERATION?
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A CHEETAH CAN GO FROM 0 M/S TO 20 M/S IN 2
SECONDS. WHAT IS THE
CAT’S ACCELERATION?A = final velocity – initial velocity
divided by 2.
10 m/s/s
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JOHN PULLS A BOX WITH A FORCE OF
4 N, AND JASON PULLS THE BOX
FROM THE OPPOSITE SIDE AT
3 N. WHAT HAPPENS?
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JOHN PULLS A BOX WITH A FORCE OF
4 N, AND JASON PULLS THE BOX
FROM THE OPPOSITE SIDE AT
3 N. WHAT HAPPENS?
The box moves toward John
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LIST THE FOLLOWING OBJECTS IN ORDER OF
LEAST INERTIA TO GREATEST
Large rock, pencil feather, book
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LIST THE FOLLOWING OBJECTS IN ORDER OF
LEAST INERTIA TO GREATEST
Large rock, pencil feather, book
Feather, pencil, book, large rock.
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A CAR TRAVELING AT 40 M/S SLOWS
TO 20 M/S. DURING THIS
TIME, THE CAR HAS…..
a. No acceleration
b. Positive acceleration
c. Negative acceleration
d. Constant velocity
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A CAR TRAVELING AT 40 M/S SLOWS
TO 20 M/S. DURING THIS
TIME, THE CAR HAS…..
a. No acceleration
b. Positive acceleration
c. Negative acceleration
d. Constant velocity
C.
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WHAT IS THE MEASURE OF
HOW MUCH FORCE IS
ACTING ON A CERTAIN AREA?
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WHAT IS THE MEASURE OF
HOW MUCH FORCE IS
ACTING ON A CERTAIN AREA?
pressure
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WHAT IS THE FORMULA FOR
PRESSURE?
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WHAT IS THE FORMULA FOR
PRESSURE?Pressure = force divided by area
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WHAT IS THE UNIT FOR
PRESSURE?
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WHAT IS THE UNIT FOR
PRESSURE?pascal
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TRUE OR FALSE:PRESSURE ACTS
IN ALL DIRECTIONS IN
LIQUIDS?
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TRUE OR FALSE:PRESSURE ACTS
IN ALL DIRECTIONS IN
LIQUIDS?True
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HOW DOES CHANGING ELEVATION
AFFECT AIR PRESSURE?
WATER PRESSURE?
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HOW DOES CHANGING ELEVATION
AFFECT AIR PRESSURE?
WATER PRESSURE?
Increasing elevation decreases air pressure
Increasing depth increases water pressure
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YOU KICK A BALL ON A
LEVEL SIDEWALK. IT
ROLLS TO A STOP BECAUSE
OF WHAT?
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YOU KICK A BALL ON A
LEVEL SIDEWALK. IT
ROLLS TO A STOP BECAUSE
OF WHAT?friction
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WORK IS CALCULATED
FROM….a. Force and speed
b. Force and distance
c. Energy and time
d. Energy and distance
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WORK IS CALCULATED
FROM….a. Force and speed
b. Force and distance
c. Energy and time
d. Energy and distance
B
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ARE YOU DOING WORK BY
BALANCING A BOOK ON YOUR
HEAD?
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ARE YOU DOING WORK BY
BALANCING A BOOK ON YOUR
HEAD?No. Work requires movement in the
direction of the force
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BY INCREASING THE SPEED AT
WHICH YOU DO WORK, YOU
WILL INCREASE WHAT?
a. Force
b. Work
c. Energy
d. power
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BY INCREASING THE SPEED AT
WHICH YOU DO WORK, YOU
WILL INCREASE WHAT?
a. Force
b. Work
c. Energy
d. Power
D
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THE UNIT OF MEASURE FOR
LARGE MOTORS AND ENGINES IS
WHAT?
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THE UNIT OF MEASURE FOR
LARGE MOTORS AND ENGINES IS
WHAT?Horsepower
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WHAT HAPPENS WHEN TWO
FORCES ACT IN THE SAME
DIRECTION?
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WHAT HAPPENS WHEN TWO
FORCES ACT IN THE SAME
DIRECTION?They add together
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ONE WAY TO INCREASE
ACCELERATION IS TO
a. Increase mass
b. Decrease mass
c. Decrease force
d. Increase both mass and force proportionally
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ONE WAY TO INCREASE
ACCELERATION IS TO
a. Increase mass
b. Decrease mass
c. Decrease force
d. Increase both mass and force proportionally
B
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WHICH OF THE FOLLOWING IS
AN EXAMPLE OF ROLLING
FRICTION?A. Your shoes on the sidewalk
while walking.
B. Bike tires on the road as you ride
C. Ice skates while skating
D. Lighting a match
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WHICH OF THE FOLLOWING IS
AN EXAMPLE OF ROLLING
FRICTION?A. Your shoes on the sidewalk
while walking.
B. Bike tires on the road as you ride
C. Ice skates while skating
D. Lighting a match
B