Warm-Up Thurs 4/12/12

1. On a graph, the steeper the slope, the _______ the speed.

2. What does a flat, horizontal line mean on a distance vs. time graph?

Force & Motion

Review

Question 1

Which one of Newton’s Laws would best fit this situation?

Alec pushes a 50 kg box across the floor with a force of 20 N. Later that day he pushes a 30 kg box with the same force.

Because the second box is less massive, it will have a greater acceleration.

A. Law 1B. Law 2C. Law 3

Question 2

Which of the following is true about acceleration?

A. Acceleration is speed in a given direction.B. Acceleration is a change in either speed or direction.C. Acceleration is distance travelled in a given amount of time.D. all of the above

Question 3

A book sitting still on a table is exerting 10 N of force onto the table. According to Newton’s 3rd Law, how much force will

be exerted back onto the book?

A. 20 NB. 0 NC. 5 ND. 10 N

Question 4Which of Newton’s Laws would best explain this scenario?

Dude and Guy are dressed as giant sumo wrestlers and are running towards each other. Once they hit, they immediately bounce off each other. Dude falls

down, but Guy does not.

A. First LawB. Second LawC. Third Law

Question 5

What is happening in this distance vs time graph?

A. Hesoo moves at a constant speedB. Hesoo moves one direction and then speeds up in the opposite direction.C. Hesoo moves in one direction, remains at rest, and then moves in the opposite directionD. Hesoo has no acceleration

Question 6

Which statement best summarizes the scientific concept shown in the cartoon?

A.A falling body accelerates at a constant speed.B. The motion of an object is constantly changing due to magnetic forces.C. The force of friction causes an object in motion to move faster.D. A body in motion will remain in motion unless influenced by an outside force.

Question 7

With what force does a 7 kg bowling ball with an acceleration of 4.0 m/s2 strike the pins?

A. 28 NB. 3 NC. 1.75 ND. 32 N

Question 8

Andrew traveling south at 80 miles per hour is an example of:

A. SpeedB. VelocityC. AccelerationD. Friction

Question 9

If all the forces acting on a moving object are balanced, then the object will:

A. slow down and stopB. change the direction of its motionC. accelerate D. continue moving at a constant velocity

Question 10

The tendency of a moving object to continue in a straight line or of a stationary object to remain in place is called:

A. GravityB. FrictionC. InertiaD. Force

Question 11

A car traveling at 90 mph hits a brick wall. The person inside the car was not wearing a seat belt. The person will continue to move even though the car has stopped. This is best explained by:

A. Newton’s First LawB. Newton’s Second LawC. Newton’s Third LawD. Gravity

Question 12

Which of Newton’s Laws would best fit this situation?

Max drops a ping pong ball on the table. The ping pong ball hits the table and then bounces back up.

A. Law 1 - InertiaB. Law 2 – F=MAC. Law 3 – Action/Reaction

Question 13

On what section of the racetrack will the forces on the cars be balanced?

A. the starting blockB. the ramp onlyC. the level section after the rampD. the entire track

Question 14

What is the correct statement about the object represented by the graph?

a.The object is speeding up.b.The object is slowing down.c.The object is moving at a constant speed.d.The object is changing direction.

Question 15

Brian flicks a penny across the floor of his classroom. Newton’s law of Inertia says the penny will

continue to move until acted on by an unbalanced force. What force is slowing the penny down?

A. FrictionB. Stretching ForcesC. GravityD. None. The forces are balanced

Question 16

A bird is flying through the air. The wings of a bird push air downward. Because of Newton’s 3rd Law, the air must also be:

A. Pushing his wings downwardB. Pushing the bird forwardC. Pushing his wings at a constant speedD. Pushing his wings upward

Question 17

A toy car travels 4 meters across the floor in 3.2 seconds. What is the speed of the car?

Speed = Distance/Time

A. 12. 5 m/sB. 1.25 m/sC. 12.8 m/sD. 0.3 m/s

Question 18

If a force of 5 N is placed on an object with a mass of 2 kg, what would the object’s

acceleration be?

A. 10 m/s2

B. 2.5 m/s2

C. 25 m/s2

D. 0.4 m/s2

Question 20

Clark rode his bicycle 24 meters to his friend’s house down the block. It took him 2 minutes to arrive at

his friend’s house. What was Clark’s average speed?

A. 24 meters/minuteB. 12 meters/minuteC. 48 meters/minuteD. 2 meters/minute

Question 21

Lunchbox rode his jet ski 50 meters south in 10 seconds, and then went east another 100 meters in the same amount of time. Which of the terms below can best be used to describe these changes? (You may use more than one)

I. SpeedII. VelocityIII. Acceleration

Question 22

Marissa’s family traveled 480 kilometers in six hours. At what point in the trip were they traveling the slowest?

A. Between hour 0 and 1 B. Between hour 1 and 2C. Between hour 3 and 4D. Between hour 5 and 6

Write a short paragraph (2-5 sentences) answering the following:

How do speed, velocity, and acceleration differ? How are they calculated?