Motion and Forces Test Review - Humble Independent School ...



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. Momentum: ___________ 7. 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? 2nd

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. 1st

b. A gun pushes the bullet forward while the bullet pushes the gun back into your shoulder. 3rd

c. If full grocery cart requires a greater net force to accelerate compared to an empty cart. 2nd

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?

The golf ball, because it has a smaller surface area so there is less air resistance.

31. Momentum is the product of an object’s _____________ and ________________, both of which affect

momentum __________.

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 kg x m/s2 (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 kg x m/s2 (Newtons) acts on a 0.5kg object. What rate of acceleration will result?

37. If a bulldozer traveling east at 5 m/s runs into a grocery cart rolling west at 5 m/s. Which has more momentum? Why? What will happen?

38. 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?

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

40. 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.)

How long would the net force need to be applied?

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

second

m/s

kilogram

meter

kg x m/s

kg x m/s2

m/s2

Resulting Vectors Balance/Unbalanced

Unbalanced

50 N

110 N

Unbalanced

Unbalanced

75 N

Balanced

0 N

force

weight

Mass

1st Law

inertia

elephant

vector

unbalanced

Balanced

net

action

pairs

reaction

Gravity

a.

Air Resistance

Rolling Friction

Engine’s Push

c.

d.

b.

Normal Force

e.

Static

gravity

Air resistance

Projectile motion

velocity

mass

equally

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