Motion and Force Unit Review

1
Motion and Force Unit Review
2
Define the following terms
3
Acceleration

• How quickly the velocity changes.

4
Balanced Force

• The net force equals zero.
• It is like having no force on the object at all

5
Centripetal Force

• Any force that keeps an object moving in a circle.

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Distance

• The amount of space between 2 points

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Force

• A push or pull on an object.
• Something that changes the motion of an object.

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Friction

• A force that resists the motion between two
  surfaces in contact.

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Gravity

• The force that objects exert on each other
  because of their masses.

10
Inertia

• The resistance of an object to a change in the
  speed or direction of its motion.

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Mass

• The amount of matter in an object.

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Motion

• A change in position over time.

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Net Force

• The overall force acting on an object when all of
  the forces acting on it are combined.

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Speed

• How fast something moves over a distance in a
  defined amount of time.

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Time

• An interval between 2 events.

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Unbalance Force

• One force acting on an object is greater than the
  other causing a change in motion of the object.

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Velocity

• Speed in a specific direction.

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Weight

• The force of gravity on an object.

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Newtons 1st Law of Motion

• Objects at rest remain at rest.
• Objects in motion remain in motion with the same
  velocity unless acted upon by an unbalanced force.

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Newtons 2nd Law of Motion

• The acceleration of an object increases with
  increased force and decreases with increased
  mass.
• The direction in which an object accelerates is
  the same as the direction of the force.

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Newtons 3rd Law of Motion

• Every time one object exerts a force on another
  object, the second object exerts a force that is
  equal in size and opposite in direction back on
  the first object.

22
Write what measurement each letter represents and
then the formula for the following
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Speed

• S D/T
• S speed
• D distance
• T time

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Distance

• D ST
• D distance
• S speed
• T time

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Time

• T D/S
• T time
• D distance
• S speed

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Force

• F MA
• F force
• M mass
• A acceleration

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Mass

• M F/A
• M mass
• F force
• A acceleration

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Acceleration

• A F/M
• A acceleration
• F force
• M mass

29
Draw a box diagram showing direction of all
forces for the following
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A Balanced Force
Fnorm
Fapp
Ffriction
Fgravity
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An object slowing down
Fnorm
Ffriction
Fapp
Fgravity
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A falling object
Fgravity
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An object rising
Fapp
Fgravity
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An object being pushed to the right
Fnorm
Ffriction
Fapp
Fgravity
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An object being pushed to the left
Fnorm
Fapp
Ffriction
Fgravity
36
Jimmy skated 50 m in 10 s. What was his average
speed?

• Formula S D/T
• Given distance 50 m and time 10 s
• Work S 50 m / 10 s 
• Answer S 5 m/s

37
What force should Lori apply to a 5 kg box to
give it an acceleration of 2 m/s2?

• Formula F MA
•  
• Given Mass 5 kg and Acc. 2 m/s2
•  
• Work F (5kg)(2 m/s2)
•  
• Answer F 10 kg/ m/s2 or 10 N

38
Which graph shows a car slowing down?

• D

39
Which graph shows a car stopped?

• C

40
Which graph shows a car traveling at constant
speed?

• A

41
32-42 Answer questions 1-5 on page 37 and 1-6 on
page 73

• 32. A
• 33. C
• 34. B
• 35. D
• 36. B

• 37. B
• 38. D
• 39. B
• 40. C
• 41. B
• 42. B