Name Date Class
Forces and Motion
Chapter Test A
Multiple Choice (2 pts each)
Write the letter of the correct answer on the line at the left.
______1. When an object’s position is changing relative to another object,
a. it is in motion. c. it has a high velocity.
b. it is speeding. d. it is accelerating.
______2. Speed equals distance divided by
a. time. c. size.
b. velocity. d. motion.
______3. The steepness of a line on a graph is called the
a. rise. c. slope.
b. run. d. vertical axis.
______4. The rate at which velocity changes is called
a. instantaneous speed. c. acceleration.
b. direction. d. motion.
______5. Forces can be added together only if they are
a. acting on the same object in the same direction
b. balanced forces.
c. acting on the same object in opposite directions
d. substantial.
______6. The force that one surface exerts on another when the two rub against each other is called
a. friction. c. inertia.
b. acceleration. d. gravity.
______7. A Ferris wheel turning at a constant rate is…
a. is accelerating. c. not accelerating
b. is not changing direction d. is speeding
______8. The greater the mass of an object,
a. the easier the object starts moving. c. the more balanced it is.
b. the greater its inertia. d. the more space it takes up.
______9. The force of gravity on a person or object on the surface of a planet is called
a. mass. c. weight.
b. friction. d. reaction force.
______10. The ability to do work or cause change is called
a. velocity. c. transfer.
b. energy. d. friction.
______11. Which of the following objects has no kinetic energy?
a. a picture hanging on a wall
b. a waterfall
c. a ball flying through the air
d. a hockey puck sliding across the ice
______12. The sum of an object's kinetic energy and potential energy is called the object's
a. combined energy. c. mechanical energy.
b. work energy. d. positional energy.
______13. A soccer ball that has just been kicked and is rolling across a flat field has
a. no mechanical energy.
b. kinetic energy only.
c. elastic potential energy only.
d. gravitational potential energy only.
______14. In a system, when energy is transformed from one form to another,
a. some energy is always destroyed. c. the total energy is conserved.
b. new energy is created. d. all energy changes to friction.
True or False (1 pt each)
If the statement is true, write true. If it is false, change the underlined word or words to make the statement true.
______15. Gravitational force depends on the mass of the objects and speed between them.
______16. A straight horizontal line on a distance-versus-time graph indicates constant speed.
______17. According to Newton’s second law of motion, weight depends on an
object’s mass and the net force acting on the object.
______18. Friction depends on the types of surfaces involved and how hard the
surfaces are push together.
______19. Friction acts in the same direction as the force applied.
______20. The handle of a spoon in a bowl of hot soup becomes warm due to heat transfer by the process of radiation.
______21. A baseball flying over the outfield wall has 52 J of kinetic energy and 20 J of potential energy. Its mechanical energy is 72J.
______22. The energy stored in an atom's nucleus is called chemical potential energy.
______23. Potential energy cannot do work until it is transformed to kinetic energy.
______24. A mousetrap with its spring set has gravitational potential energy.
Using Science Skills (3 pts each)
Use the figure at the right to answer the following questions in the spaces provided.
25. What does the head of each arrow indicate?
26. What is the net force acting on each object?
27. At which point on its path is the ball's gravitational potential energy the greatest? Explain.
28. At which point in its path is the ball's kinetic energy at its highest? Explain.
29. If the gravitational potential energy at point B is 726J, what is the kinetic energy at point D (right before it hits the ground)? ______
Math Problems (show all work) (3 pts each)
30. (show all work) What force is necessary to accelerate a 70.0 kg object at a rate of 4.20 m/s2?
31. (show all work) An airplane travels 1615 km in 8.0 hours. What is the airplane’s speed?
32. (show all work) A swimmer starts off their race at a velocity of 2.6 m/s north and ends up at a velocity of 3.8 m/s north. It takes the swimmer 45s to finish. What is her acceleration?
33. (show all work) What is the speed of the object from 0 to 4s?
34. Describe the motion of the object from 4-6s.
35. (show all work) A 0.10 kg ball rolls across the floor at a speed of 2.0 m/s. Another 0.10 kg ball rests on a shelf 1.0 m above the floor. Which ball has more energy?
36. (show all work) Find the mechanical energy of a 2.0 kg baseball moving with a speed of 3.4 m/s 6.0 m above the ground.
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Chapter Tests
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