Motion Forces Practice Test

Directions

Multiple Choice Section • Choose the choice which best completes the

following statements or answers the following questions.

• Write the answer on your paper

1. The basic SI (metric) unit of length is the

(1.) yard. (2.) foot. (3.) meter. (4.) mile.

2. An object is in motion when it changes position relative to

(1.) the observer. (2.) the sun.(3.) Earth's surface. (4.) a reference point.

3. The unit for _____ is m/s.

(1.) weight (2.) acceleration (3.) inertia (4.) velocity

4. The unit for _____ is m/s/s. (1.) weight (2.) acceleration (3.) inertia (4.) velocity

5. A constant velocity means acceleration is (1.) positive (2.) negative (3.) increasing (4.) zero

6. If a car's velocity changes from 0 m/s to 40 m/s 10 seconds later, its average acceleration is

*Use your formula(1.) 1 m/s/s (2.) 4 m/s/s (3.) 10 m/s/s (4.) 20 m/s/s

6. If a car's velocity changes from 0 m/s to 40 m/s 10 seconds later, its average acceleration is

(1.) 1 m/s/s (2.) 4 m/s/s (3.) 10 m/s/s (4.) 20 m/s/s

7. To skate 100 m in 25 s, a skater must skate at an average speed of

(1.) 2 m/s (2.) 4 m/s (3.) 5 m/s (4.) 10 m/s

8. A body accelerates if it

(1.) speeds up (2.) slows down (3.) changes direction (4.) all of these

9. Our most common frame of reference is the

(1.) Earth (2.) moon (3.) sun (4.) atmosphere

10. To skate 80 m in 20 s, a skater must skate at an average speed of

(1.) 2 m/s(2.) 4 m/s (3.) 5 m/s (4.) 10 m/s

11. If a car's velocity changes from 0 m/s to 30 m/s in 10 seconds, its average acceleration is

(1.) 1 m/s2 (2.) 10 m/s2 (3.) 3 m/s2 (4.) 20 m/s2

12. Motion can be best described as a change in

(1.) velocity (2.) acceleration(3.) speed (4.) position

13. Any change over time is called a(n)

(1.) rate (2.) period (3.) average (4.) constant

14. Velocity describes both ______ and _______ of an object.

(1.) speed and force (2.) speed and direction (3.) acceleration and speed (4.) speed and distance

15. Which the correct relationship between speed and distance?

(1.) Speed = Distance x Time(2.) Speed = Time x Distance (3.) Speed = Distance / Time (4.) Speed = Time / Distance

16. To calculate average speed, you need to

(1.) the total distance traveled. (2.) the total time to make the trip. (3.) the total time, speed of travel, and direction

of travel. (4.) the total distance traveled and the total

time.

17. To determine the velocity of a moving object, you need to know both its speed and its

(1.) distance traveled. (2.) acceleration. (3.) direction of motion. (4.) time of travel.

18. A Ferris wheel moving at constant speed is accelerating because the

(1.) direction is always changing. (2.) wheel moves relative to the ground.(3.) wheel moves relative to the sun. (4.) the average speed does not change.

19. Which statement is correct?

(1.) Velocity is acceleration divided by time. (2.) Acceleration is a change in rate of speed(3.) Acceleration is distance divided by time. (4.) Velocity to be properly calculated needs to

be only given a numerical value.

20. To calculate acceleration, you need to know the

(1.) final velocity and total time. (2.) initial velocity and total time. (3.) final velocity and initial velocity. (4.) final velocity, initial velocity, and the total

time.

21. The acceleration of an object depends upon the mass of the object and

(1.) its momentum (2.) its weight(3.) the force applied to it (4.) the work done on it

True/False

22. Forces are always balanced

True/False

22. Forces are always balanced: FALSE

True/False

23. Gravity is a force

True/False

23. Gravity is a force: TRUE

True/False

24. Weight = Mass x Gravity

True/False

24. Weight = Mass x Gravity TRUE

True/False

25. The net force on an object equal to zero means that the forces acting on an object are unbalanced

True/False

25. The net force on an object equal to zero means that the forces acting on an object are unbalanced

FALSE

Fill-In/Completion

26. ________________ is an object's resistance to change in motion.

Fill-In/Completion

26. INERTIA is an object's resistance to change in motion.

27. An object's inertia is due to its _________________.

27. An object's inertia is due to its MASS.

28. As you ascend (go up) and travel away from the Earth in a spacecraft, your ___________________changes.

28. As you ascend (go up) and travel away from the Earth in a spacecraft, your WEIGHT changes.

29. A penny will fall at the same rate as a feather on ________________________.

29. A penny will fall at the same rate as a feather on THE MOON.

30. Friction is a force that pushes _____________________________________ the motion of an object.

30. Friction is a force that pushes OPPOSITE the motion of an object.

31. Balanced forces are _________________________ and _________________________________.

31. Balanced forces are EQUAL and OPPOSITE

32. To graph speed, you place ________________ on the x axis and _______________ on the y axis.

32. To graph speed, you place TIME on the x axis and DISTANCE on the y axis.

33. To graph acceleration, you place ________________ on the x axis and _______________ on the y axis.

33. To graph acceleration, you place TIME on the x axis and VELOCITY (OR SPEED) on the y axis.

34. The force of gravity depends upon the _______________________ and _________________________ of objects.

34. The force of gravity depends upon the DISTANCE BETWEEN and MASSES of objects.

35. When a parachute is descending, _____________________ is the largest force.

35. When a parachute is descending, GRAVITY is the largest force.

36. Objects fall at different rates on Earth because of _____________________________.

36. Objects fall at different rates on Earth because of AIR RESISTANCE.

37. Forces always act in _____________________________.

37. Forces always act in PAIRS.

38. __________ is a force that resists motion between two surfaces that are in contact

38. FRICTION is a force that resists motion between two surfaces that are in contact

39. ____________________________ is the total force acting on objects.

39. NET FORCE is the total force acting on objects.

40. Newton's First Law of Motion states that an object will remain at rest or keep moving in a straight line with constant speed unless an _____________________ acts on it.

40. Newton's First Law of Motion states that an object will remain at rest or keep moving in a straight line with constant speed unless an UNBALANCED FORCE acts on it.

41. Newton's Third Law of Motion states that for every force there is a reaction force that is _______________ in size, and _____________ in direction.

41. Newton's Third Law of Motion states that for every force there is a reaction force that is EQUAL in size, and OPPOSITE in direction.

42. ___________________________ occurs when the downward force of gravity on an object is equal to the upward force of air resistance on the object.

42. TERMINAL VELOCITY is reached when the downward force of gravity on an object is equal to the upward force of air resistance on the object.

43. The two factors that determine the amount of friction are a. the ______________________ of the object,b. the ______________________ of the surface.

43. The two factors that determine the amount of friction are a. the MASS of the object,b. the TEXTURE of the surface.

44. You are riding fast on a skateboard when your wheel suddenly gets stuck in a crack on the sidewalk. Your body goes flying forward because of __________________________.

44. You are riding fast on a skateboard when your wheel suddenly gets stuck in a crack on the sidewalk. Your body goes flying forward because of INERTIA.

45. When you walk forward on the floor, your foot pushes back, and the floor pushes _________________.

45. When you walk forward on the floor, your foot pushes back, and the floor pushes FORWARD.

46. To slide a box across a floor, you must apply a force greater than the force of ____________________.

46. To slide a box across a floor, you must apply a force greater than the force of FRICTION.

47. Slowing down while moving is technically called __________________________ acceleration

47. Slowing down while moving is technically called NEGATIVE acceleration

48. Segment _____ to ______ on the graph represents the object's greatest speed.

48. Segment A to B on the graph represents the object's greatest speed.

49. The object travels at a constant rate between points ____ and _____ , and also between points ____ and _____ on the graph.

49. The object travels at a constant rate between points A and B, and also between points C and D on the graph.

50. The object does not move between points _________ and _______ on the graph.

50. The object does not move between points B and C on the graph.

51.On this graph, the dependent variable is

__________________________.

a. distance.b. speed.c. acceleration.d. the slope of the speed vs. distance curve.

52. The speed of the object shown on graph shown below is __________________.

a. 0.5 m/secb. 0.75 m/secc. 2 m/secd. 3 m/sec

52. The speed of the object shown on graph shown below is __________________.

S = d/tS = 2 m/4 sS = 0.5 m/s

a. 0.5 m/secb. 0.75 m/secc. 2 m/secd. 3 m/sec

53. Graph _____________ shows an increase in speed, immediately followed by a steady decrease in speed.

53. Graph C shows an increase in speed, immediately followed by a steady decrease in speed.

54. Graph _____________ shows a constant speed, followed by an increase in speed, followed by a constant speed, followed by a decrease in speed to zero?

54. Graph D shows a constant speed, followed by an increase in speed, followed by a constant speed, followed by a decrease in speed to zero?

55. An astronaut brings her lucky horseshoe on a mission to the moon. Would the astronaut's lucky horseshoe weigh the same, more, or less on the moon than it did on the Earth? Why?

55. An astronaut brings her lucky horseshoe on a mission to the moon. Would the astronaut's lucky horseshoe weigh the same, more, or less on the moon than it did on the Earth? Why?

Answer: The horseshoe would weigh less. Weight is a measure of the pulling force of gravity, and since the gravity exerted by the moon on the horseshoe is less (by 1/6th) than the gravity exerted by the Earth on the horseshoe, the horseshoe would actually weigh less on the moon.

56. An astronaut brings her lucky horseshoe on a mission to the moon. Would the lucky horseshoe's mass on the moon be the same, greater than, or less than the mass of the horseshoe when it is on the Earth? Why?

56. An astronaut brings her lucky horseshoe on a mission to the moon. Would the lucky horseshoe's mass on the moon be the same, greater than, or less than the mass of the horseshoe when it is on the Earth? Why?

ANSWER: The mass of the horseshoe would be the same. Mass is a measure of the amount of matter in an object, and the amount of matter in the horseshoe does not change when it is taken from one place to another.

57. Would you be more likely to win a 12 kilometer race if you ran at a constant speed of 6 kilometers per hour, or if you ran at a constant speed of 8 kilometers per hour? Explain how you arrived at your answer.

57. Would you be more likely to win a 12-kilometer race if you ran at a constant speed of 6 kilometers per hour, or if you ran at a constant speed of 8 kilometers per hour? Explain how you arrived at your answer.

You would win the race at a speed of 8 kilometers per hour, because it is a faster speed than 6 kilometers per hour. If you ran at 8 kilometers per hour, you would have run 12 kilometers after 1.5 hours. If you ran at 6 kilometers per hour, you would take 2 hours to run 12 kilometers.

58. A boy riding a bicycle travels 10 miles in 2 hours. He stops to rest for one hour and then continues his ride. For the next one hour he rides 10 miles. During this ride, what was the rider's average speed for the trip?

58. A boy riding a bicycle travels 10 miles in 2 hours. He stops to rest for one hour and then continues his ride. For the next one hour he rides 10 miles. During this ride, what was the rider's average speed for the trip?Answer: Average speed is the average of speed of the entire time period of travel. This is calculated by dividing total distance by total time.Total D = 10 mi. + 0 mi. + 10 mi. Total D = 20 mi.

Total T = 2 hours + 1 hour + 1 hour Total T = 4 hours

Average Speed = Total D/Total TAverage Speed = 20 mi./4 hours Avg. Speed = 5 miles/hour

Motion Forces Practice Test

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