1. Worksheet: Chapters 1-7 Review
Grading rubric

2. 1. Give the units for the following quantities and tell me whether they are a vector or scalar quantity.
Quantity
Units
Vector or Scalar
Distance
 meters (m)
Scalar
Speed
m/s
Time
Seconds (s)
Velocity
Vector
Mass Kg
Acceleration
m/s2
Vector 
Force
Newtons (N)
 Vector

3. 2. What two things does a vector tell us?

4. 2. What two things does a vector tell us?
Magnitude and diretion

5. 3. What one thing does a scalar quantity tell us?

6. 3. What one thing does a scalar quantity tell us?
Magnitude

7. 4. What is the difference between speed and velocity?

8. 4. What is the difference between speed and velocity?
Speed is a scalar quantity and velocity is a vector (Velocity has a direction as well as magnitude)

9. 5. Give me a situation when an object can have constant speed but not constant velocity.

10. 5. Give me a situation when an object can have constant speed but not constant velocity.
Moving in a curved path at constant speed

11. 6. What is a force?

12. 6. What is a force?
A push or pull on an object

13. 7. What is net force?

14. 7. What is net force?
The sum of all forces acting on an object

15. 8. Diagram the following on the diagram to the right:
a. Force of gravity
b. Support or Normal Force
c. What is the net force?

16. 8. Diagram the following on the diagram to the right:
a. Force of gravity
b. Support or Normal Force
c. What is the net force?
Support or normal force
Force of gravity
Net force = 2 – 2 = 0N

17. 9. The force of gravity is also known as

18. 9. The force of gravity is also known as
weight

19. a. 200 Newtons down and 50 Newtons up
10. Calculate the resultant vector for the following vectors (draw a diagram of each)
a. 200 Newtons down and 50 Newtons up
50 N
-200 N

20. a. 200 Newtons down and 50 Newtons up
10. Calculate the resultant vector for the following vectors (draw a diagram of each)
a. 200 Newtons down and 50 Newtons up
50 N
-200 N
-150 N

21. b. 45 Newtons pushing a crate with 15 Newtons of friction.
10. Calculate the resultant vector for the following vectors (draw a diagram of each)
b. 45 Newtons pushing a crate with 15 Newtons of friction.
15N
45 N

22. b. 45 Newtons pushing a crate with 15 Newtons of friction.
10. Calculate the resultant vector for the following vectors (draw a diagram of each)
b. 45 Newtons pushing a crate with 15 Newtons of friction.
15N
45 N
Net force = 30N

23. 10. Calculate the resultant vector for the following vectors (draw a diagram of each)
c. A 10 kg rock falling with 50 Newtons of air resistance. (Hint: Remember that Force of gravity (Fg) equals mass x gravity (Fg = mg)
Fg = mg
Fg = (10kg)(10 m/s2)
Fg = 100 N
50 N
-100 N

24. 10. Calculate the resultant vector for the following vectors (draw a diagram of each)
c. A 10 kg rock falling with 50 Newtons of air resistance. (Hint: Remember that Force of gravity (Fg) equals mass x gravity (Fg = mg)
Fg = mg
Fg = (10kg)(10 m/s2)
Fg = 100 N
50 N
-100 N
-100 N

25. 10. Calculate the resultant vector for the following vectors (draw a diagram of each)
d. A boat rowing across a river at 5 km/hr with a current flowing at 3 km/hr
5km/hr
3 km/hr

26. 10. Calculate the resultant vector for the following vectors (draw a diagram of each)
d. A boat rowing across a river at 5 km/hr with a current flowing at 3 km/hr
5km/hr
3 km/hr

27. 10. Calculate the resultant vector for the following vectors (draw a diagram of each)
e. An airplanes groundspeed when is it flying at 250 km/hr with a 50 km/hr headwind.
250 km/hr
50 km/hr headwind

28. 10. Calculate the resultant vector for the following vectors (draw a diagram of each)
e. An airplanes groundspeed when is it flying at 250 km/hr with a 50 km/hr headwind.
250 km/hr
50 km/hr headwind
200 km/hr groundspeed

29. 10. Calculate the resultant vector for the following vectors (draw a diagram of each)
f. An airplanes groundspeed when is it flying at 250 km/hr with a 50 km/hr tailwind.
250 km/hr
50 km/hr tailwind

30. 10. Calculate the resultant vector for the following vectors (draw a diagram of each)
f. An airplanes groundspeed when is it flying at 250 km/hr with a 50 km/hr tailwind.
250 km/hr
50 km/hr tailwind
300 km/hr groundspeed

31. 11. What is friction? Which way does it always act in relation to the motion of an object?

32. 11. What is friction? Which way does it always act in relation to the motion of an object?
A force that acts in the opposite direction to motion

33. 12. What is Newton’s First Law of Motion?

34. 12. What is Newton’s First Law of Motion?
The law of inertia
An object at rest will remain at rest, an object in motion will remain in motion unless acted on by a net force.

35. 13. What is the difference between mass and weight?

36. 13. What is the difference between mass and weight?
Mass is the amount of matter that exists in an object (it does not change). Weight is the effect of gravity on a mass (weight changes when gravity changes. i.e. on the moon compared to Earth)

37. 14. What is the difference between average speed and instantaneous speed?

38. 14. What is the difference between average speed and instantaneous speed?
Average speed- total distance divided by total time
Instantaneous speed- the speed at any given time

40. 16. What is the value of the acceleration of gravity (g) on Earth?

41. 16. What is the value of the acceleration of gravity (g) on Earth?
9.8 m/s2

42. 17. What is free fall?

43. 17. What is free fall?
A falling object when we disregard the force of air resistance (only force acting on object is the force of gravity)

44. 18. If you throw an object straight up and it takes 6 seconds to return to you, how long did it take to get to the top? From the top of its path back down to you?
6 seconds to go up and down

45. 18. If you throw an object straight up and it takes 6 seconds to return to you, how long did it take to get to the top? From the top of its path back down to you?
6 seconds to go up and down
3 seconds to get to top and 3 seconds from top to bottom

46. 19. If you throw a rock straight up at 10 m/s, what will its speed be when you catch it again?

47. 19. If you throw a rock straight up at 10 m/s, what will its speed be when you catch it again?

48. 20. What is a projectile?

49. 20. What is a projectile?
An object traveling through space only acted upon by gravity (disregard air resistance)

50. 21. Label and diagram below showing the terms and values: range, minimum vertical velocity, maximum vertical velocity, trajectory

51. 21. Label and diagram below showing the terms and values: range, minimum vertical velocity, maximum vertical velocity, trajectory
trajectory
Minimum vertical velocity
range
Maximum vertical velocity

52. 22. What force causes a projectile to fall short of its idealized path?

53. 22. What force causes a projectile to fall short of its idealized path?
Air resistance

54. 23. What is Newton’s Second Law
23. What is Newton’s Second Law? Show the equation that summarizes the law.

55. F=ma the relationship between force, mass, and acceleration
23. What is Newton’s Second Law? Show the equation that summarizes the law.
F=ma the relationship between force, mass, and acceleration

58. 26. How is acceleration and Force related
26. How is acceleration and Force related? How about acceleration and mass?

59. 26. How is acceleration and Force related
26. How is acceleration and Force related? How about acceleration and mass?
“a” is directly proportional to “F”
“a” is inversely proportional to “m”

60. 27. What is required to accelerate an object?

61. 27. What is required to accelerate an object?
A force

63. 29. What is terminal velocity or speed?
When a falling objects force of gravity equals the air resistance force (net force = 0). The maximum velocity

64. 30. What is the net force acting on an object that has reached terminal velocity?

65. 30. What is the net force acting on an object that has reached terminal velocity?
zero

67. 32. What is Newton’s Third Law?
Action – reaction
(For every action, there is an equal and opposing reaction)

68. 33. Label action force and reaction force in the diagram to the right.

69. action reaction or reaction action
33. Label action force and reaction force in the diagram to the right.
action
reaction or
reaction action

70. 34. How can you compare the two forces in the diagram to the right
34. How can you compare the two forces in the diagram to the right? How about the acceleration of the gun compared to the bullet? Use F=ma to explain
Forces-
b. Accelerations-
bullet F = ma
gun F = ma

72. 36. How much time will it take for a person to walk the length of a the San Clemente Pier (400 yards) at a constant speed of 5 ft/s?

73. 37. Suppose you take a trip that covers 50 km and takes 1 hours to make. What is your average speed?

82. 46. If a projectile is fired straight up at a speed of 20 m/s, the total time to return to its starting point is about
v0= 0 m/s
t = ?
g = 10 m/s2
t= 2 x 2s = 4s
v = 20 m/s