Motion and Forces Test Review



Motion and Forces Test Review Name: _______________

Name the SI units for the following measures:

1. Mass: _________ 2. Distance: __________ 3. Time: __________ 4. Velocity: _________

5. Acceleration: ____________ 6. Force: ____________

Calculate the Net force and draw the resulting force vector and with the correct net force.

100 N 50 N

8.

______________________ ________________________

135 N

75 N

9. 50 N

______________________ ________________________

50 N

10.

25 N

______________________ ________________________

90 N 90 N

11.

______________________ ________________________

12. A _________________ is often described as a push or pull.

13. ________________ is a measure of the amount of matter in an object while _______________ is a measure of the force of gravity acting on an object.

14. Which of Newton's Laws is sometimes called the Law of Inertia. ____________________.

15. The tendency of an object to resist a change in motion is called _________________.

16. Which has more inertia, a full grown elephant or a dog? _________________

17. Velocity, acceleration, force and momentum are ___________ quantities. They have magnitude and direction.

18. For an object to accelerate (velocity changes) it must be acted on by an __________________ force.

19. __________________forces produce no change in motion.

20. The combination of all the forces acting on an object is called the _______ force.

21. Which of Newton’s Laws describes the mathematical relationship between force, mass, and acceleration?

22. Newton’s Third Law states that forces exist in _______________, and for every __________ force there is an

equal and opposite _____________ force.

23. Which of Newton’s Laws does each example illustrate?

a. A elephant sitting is hard to move, but a charging elephant is hard to stop.

b. A gun pushes the bullet forward while the bullet pushes the gun back into your shoulder.

c. If full grocery cart requires a greater net force to accelerate compared to an empty cart.

24. Identify the forces

[pic]

25. _____________ friction exists between two objects in contact when neither are moving.

26. If a stationary object has a net force of 25 Newtons acting on it, the object will (remain at rest/accelerate).

27. If an object is pushed with a constant net force, reducing its mass would cause the object’s acceleration to (increase/decrease).

28. The principal forces acting on a object that is given an initial forward velocity are __________________

and _____________________.

29. Which shows the path an object would follow if pushed off a table?

a. b. c.

What is the name given to this type of motion? _________________ ________________

30. A feather and a golf ball fall from 10 meters above the ground. Which hits the ground first?

Using the terms air resistance and terminal velocity explain why?

Problem Solving

31. Jim takes 45 seconds to walk 180 meters north to a store. What is Jim’s velocity in meters per second?

32. A car moving west slows down from a velocity of 50 m/s to 20 m/s in 15 seconds. What is its acceleration?

33. Over the last ten seconds of his walk Jim increased his velocity from 2 m/s north to 6 m/s north to cross the street before the light changed. What was Jim's acceleration?

34. An object with a mass of 25 kg accelerates east at a rate of 7 m/s2. What net force is acting on the object?

35. A force of 3,200 Newtons acts on a truck giving it an acceleration of 2 m/s2. What is the mass of the truck?

36. A force of 150 Newtons acts on a 0.5kg object. What rate of acceleration will result?

37. If 5 year old Johnny is pushing a full grocery cart and big brother decides to help push, will the cart accelerate? Why or why not?

38. If Jim has a mass of 70 kg and is running at a rate of 6 m/s, what would his momentum be?

39. What Net Force would be required for Jim to accelerate at a rate of 1.5m/s2 from 6 m/s to 9 m/s? (Remember, Jim has a mass of 70kg.)

-----------------------

Resulting Vectors Balance/Unbalanced

a.

c.

d.

b.

e.

................
................

In order to avoid copyright disputes, this page is only a partial summary.

Google Online Preview   Download