a projectile launched at 20 m/s at an angle of 30 o lands on a level surface. how far away does it...
TRANSCRIPT
A projectile launched at 20 m/s at an angle of 30o lands on a level surface. How far
away does it land?
40 meters
20 meters
34 meters
9.8 meters
17 meters
0% 0% 0%0%0%
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1. 40 meters2. 20 meters3. 34 meters4. 9.8 meters5. 17 meters
The magnitude of the centripetal acceleration.
ac=v/r2
ac=r/v
ac=v2/r2
ac=v2/r
0% 0%0%0%
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1. ac=v/r2
2. ac=r/v
3. ac=v2/r2
4. ac=v2/r
The acceleration of an object in uniform circular motion:
Is ze
ro
Points outw
ard
Points to
the ...
Points in th
e ...
0% 0%0%0%
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1. Is zero2. Points outward3. Points to the center4. Points in the
direction the object is moving
A push or a pull
Acceleration
Pressu
re Fo
rce M
ass
0% 0%0%0%
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1. Acceleration2. Pressure3. Force4. Mass
Forces are measured in:
Newto
ns
Kilogra
ms
Pascals
m/s2
0% 0%0%0%
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1. Newtons2. Kilograms3. Pascals4. m/s2
On earth the force of gravity acting on a 4.5 kg object is
0.45 N 4.5 kg
45 N 450 N
0% 0%0%0%
1. 0.45 N2. 4.5 kg3. 45 N4. 450 N
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What is the mass of an 18 kg object on earth?
1.8 kg 1.8 N
18 kg 180 N
0% 0%0%0%
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1. 1.8 kg2. 1.8 N3. 18 kg4. 180 N
If a 2.0 kg textbook were taken to the moon its mass there would be:
Significa
ntly sm
aller t
ha... Zero
Still 2
.0 kg
Significa
ntly la
rger t
han...
0% 0%0%0%
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1. Significantly smaller than on earth.
2. Zero3. Still 2.0 kg4. Significantly larger
than on earth
Which of the following is NOT a fundamental force of nature?
Weak N
uclear F
...
Electr
omagneti...
Fricti
on Force
Grav
itational ..
.
0% 0%0%0%
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1. Weak Nuclear Force2. Electromagnetic
Force3. Friction Force4. Gravitational force
Newton’s first law states:
Moving th
ings ...
Constant v
eloc...
This go in
a s...
0% 0%0%
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1. Moving things tend to slow down and stop if not acted on by a force.
2. Constant velocity motion is only possible if no forces act on an object.
3. This go in a straight line at constant speed when the net force is zero.
Tendency of an object to continue moving like it already was.
Densit
y
Power Fo
rce
Inerti
a
0% 0%0%0%
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1. Density2. Power3. Force4. Inertia
Things have more inertia if they have a greater:
Densit
y
Volume M
ass
Free fa
ll acce
...
0% 0%0%0%
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1. Density2. Volume3. Mass4. Free fall
acceleration
Micro (m)
x10-9
x10-6
x10+3
x10+12
0% 0%0%0%
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1. x10-9
2. x10-6
3. x10+3
4. x10+12
A ball is thrown straight up. At its highest point its velocity is ____ and its
acceleration is _____
0, 0
0, 10 m
/s2 dow...
10 m/s,
0
10 m/s,
10 m/s
...
0% 0%0%0%
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1. 0, 02. 0, 10 m/s2 down3. 10 m/s, 04. 10 m/s, 10 m/s2 up
A 5.0 kg object experiences a forward force of 20.0 N and a backwards force of 5 N. The net force is:
50 N 25 N
75 N 15 N
0% 0%0%0%
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1. 50 N2. 25 N3. 75 N4. 15 N
A 5.0 kg object experiences a forward force of 20.0 N and a backwards force of 5 N. The acceleration is:
9.8 m/s2
5.0 m/s2
3.0 m/s2
0.67 m/s2
0% 0%0%0%
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1. 9.8 m/s2
2. 5.0 m/s2
3. 3.0 m/s2
4. 0.67 m/s2
If the frictional force is 40 N and the normal force is 200 N the frictional coefficient is:
5. .5 .4 .2
0% 0%0%0%
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1. 5.02. 0.53. 0.44. 0.2
A horizontal force of 35 N causes a 2.0 kg object to accelerate at 2.5 m/s2 across the
floor. The net force is____.
35 N 20 N
5.0 N 0.0 N
0% 0%0%0%
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1. 35 N2. 20 N3. 5.0 N4. 0.0 N
A horizontal force of 35 N causes a 2.0 kg object to accelerate at 2.5 m/s2 across the
floor. The frictional force is____.
35 N 30 N
10 N 0 N
0% 0%0%0%
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1. 35 N2. 30 N3. 10 N4. 0 N
A horizontal force of 35 N causes a 2.0 kg object to accelerate at 2.5 m/s2 across the floor. The
coefficient of friction is____.
0 of 301.5 .67 .2 .1
0% 0%0%0%
1. 1.52. 0.673. 0.204. 0.10
On earth 1.0 kg weighs
2.2 lbs
0.1 N 1.0 kg
2.54 lbs
0% 0%0%0%
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1. 2.2 lbs2. 0.1 N3. 1.0 kg4. 2.54 lbs
If 2.0 kg weighs 8.0 N on the surface of a planet, the acceleration of a dropped object would be:
10 m/s2
Depends o
n the...
16 m/s2
4.0 m/s2
0% 0%0%0%
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1. 10 m/s2
2. Depends on the mass
3. 16 m/s2
4. 4.0 m/s2
Equal to kg m/s∙ 2.
Lite
rs M
ph
Newto
ns
Watts
0% 0%0%0%
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1. Liters2. Mph3. Newtons4. Watts
If a 140 kg football player collides with an opponent who is only 60 kg which player exerts a larger force?
The 140 kg pla...
The 60 kg play...
The force
s are
...
0% 0%0%
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1. The 140 kg player2. The 60 kg player3. The forces are equal
in magnitude
An object will fall at constant speed
Once
air resis
...
Only on th
e mo...
Only if
it has..
.
Only if
there
...
0% 0%0%0%
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1. Once air resistance exerts a force equal to the weight of the object
2. Only on the moon3. Only if it has a
parachute or a propeller.
4. Only if there is no gravity
A 6.0 kg object traveling at 5.0 m/s strikes a 2.0 kg object that is initially at rest. What is the
total momentum following the collision?
11 kg m
/s
75 kg m
/s
30 kg m
/s
Can not be det..
.
0% 0%0%0%
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1. 11 kg m/s 2. 75 kg m/s 3. 30 kg m/s 4. Can not be
determined
A solid block of metal measures 5 cm x 6 cm x 10 cm and has a mass of 1.8 kg. The density of the metal is:
3.0 g/cm
3
300 g/cm
3
6.0 g/cm
3
1.0 g/cm
3
0% 0%0%0%
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1. 3.0 g/cm3
2. 300 g/cm3
3. 6.0 g/cm3
4. 1.0 g/cm3
Kepler determined that planets travel in ________ orbits.
Circular
Ellip
tical
Parabolic
Linear
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1. Circular2. Elliptical3. Parabolic4. Linear
Demonstrated that objects on earth experience a gravitational attraction?
Kepler
Newto
n
Galile
o
Cavendish
0% 0%0%0%
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1. Kepler2. Newton3. Galileo4. Cavendish
Formulated three laws of planetary motion:
Galile
o
Einste
in
Kepler
Newto
n
0% 0%0%0%
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1. Galileo2. Einstein3. Kepler4. Newton
What is the acceleration of a car going around a 100 m radius turn at a constant speed of 20 m/s?
0 m/s
2
10 m/s2
0.20 m/2
4.0 m/s2
0% 0%0%0%
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1. 0 m/s2
2. 10 m/s2
3. 0.20 m/2
4. 4.0 m/s2
A 6.0 kg object traveling at 5.0 m/s strikes a 2.0 kg object that is initially at rest. If the objects
stick together, what is their speed following the collision?
5.0 m/s
3.75 m/s
2.5 m/s
0.0 m/s
0% 0%0%0%
1. 5.0 m/s2. 3.75 m/s3. 2.5 m/s4. 0.0 m/s
0 of 30
A ball that is thrown straight up at 20 m/s reaches a maximum height of
10 m 20 m
40 m 80 m
0% 0%0%0%
0 of 30
1. 10 m2. 20 m3. 40 m4. 80 m
What is the momentum of a 6.0 kg object traveling at 5.0 m/s?
11 kg m
/s
75 kg m
/s
30 kg m
/s
1.2 kg m
/s
0% 0%0%0%
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1. 11 kg m/s2. 75 kg m/s3. 30 kg m/s4. 1.2 kg m/s