# GCU PHY102 week 1 Motion Exercises

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GCU PHY102 week 1 Motion Exercises

PHY-102: Motion Exercises

Complete the following exercises.

1. Jane is

collecting data for a ball rolling down a hill.

She measures out a set of different distances and then proceeds to use a

stopwatch to find the time it takes the ball to roll each distance.

a. What is

the independent variable in her experiment?

b. What is

the dependent variable in her experiment?

c. Give one

control variable for her experiment.

2. Consider

an experiment where you drop an object.

a. Briefly

describe your proposed experiment. (Make sure it is controlled).

b. What

would be the independent variable for your experiment?

c. What

would be the dependent variable for your experiment?

d. Give one

control variable for your experiment.

Consider a freely falling object. V = a * t

e. What is

the acceleration (in m/s2) after 5 seconds of fall?

f. What is

the acceleration (in m/s2) after 10 seconds of fall?

g. What is

the velocity (in m/s) after 5 seconds of fall?

h. What is

the velocity (in m/s) of 10 seconds of fall?3. A

sign is hung between two cables as illustrated below. If the sign weighs 350 N,

what is the te nsion (in N) in each cable?

4. A

construction worker on a high-rise building is on a platform suspended between

two cables as illustrated below. The construction worker weighs 850 N, the

plank weighs 450 N, and the tension in the left cable is 550 N.

a. What is

the tension (in N) in the right cable?

b. Explain

your answer.

5. Two

forces of 50 N and 30 N, respectively, are acting on an object. Find the net

force (in N) on the object if …

a. the

forces are acting in the same direction

b. the

forces are acting in opposite directions.

6. A box is

pulled straight across the floor at a constant speed. It is pulled with a horizontal force of 48 N.

a. Find the

net force (in N) on the box.

7. Describe

the speed and acceleration of the ball released from the top of the track shown

in the figure below.

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8. Describe

the speed and acceleration of the ball released from the top of the track shown

in the figure below.

9. You throw

a ball upward with a speed of 14 m/s.

What is the acceleration of the ball after it leaves your hand? Ignore air resistance and provide an

explanation for your answer.

10. How would

your answer to the previous question change if you take into account the

effects of air resistance?

11. Describe

the speed and acceleration of a person sky diving. Include in your explanation a description of

the motion before the parachute is opened as well as a description of the

motion after the parachute is opened.

12. A net

force of 24 N is acting on a 4.0-kg object.

Find the acceleration in m/s2.

13. A person

pulls horizontally with a force of 64 N on a 14-kg box. There is a force of friction between the box

and the floor of 36 N. Find the

acceleration of the box in m/s2. Show your work.

The remaining questions are multiple-choice questions:

14. One

difference between a hypothesis and a theory is that a hypothesis

A. is a

guess that has not been well tested, whereas a theory is a synthesis of

well-tested guesses.

B. is

testable, whereas a theory is not testable.

C. can be

revised, whereas a theory cannot be revised.

D. is not

testable, whereas a theory is testable.

15. A car

starts from rest and reached a speed of 24 m/s in 6 seconds. What is the acceleration of the car?

A. 144 m

B. 6 m/s2

C. 4 m/s2

D. 10 m/s2

E. 0 m/s2

16. Which of

the following forces is NOT a contact force?

A. Friction

force

B. Support

force

C. Force of

gravity

D. Tension

force

17. If you

pull horizontally on a desk with a force of 150 N and the desk doesn’t move,

the friction force must be 150 N. Now if you pull with 250 N so the desk slides

at constant velocity, the friction force is

A. more than

150 N, but less than 250 N.

B. 250 N.

C. more than

250.

18. Suppose a

particle is accelerated through space by a constant 10 N force. Suddenly the

particles encounters a second force of 10 N in a direction opposite to that of

the first force. The particle

A. is

brought to a rapid halt.

B. theoretically

accelerates to speeds approaching the speed of light.

C. continues

at the speed it had when it encountered the second force.

D. gradually

slows down to a halt.

19. Newton’s

First Law of Motion applies to

A. objects

at rest only.

B. moving

objects only.

C. both

moving and nonmoving objects.

20. A freely

falling object starts from rest. After falling for 2 seconds, it will have a

speed of about

A. 5 m/s

B. 10 m/s

C. 20 m/s

D. 40 m/s

21. Suppose an

object is in free fall. Each second the object falls

A. the same

distance as in the second before.

B. a larger

distance than in the second before.

C. with the

same instantaneous speed.

D. with the

same average speed.

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