Forces and Motion Review

What is the acceleration difference between car 1 and car 2?

• Car 1 starts & stops and Car 2 stays constant

• Car 1 changes velocity and Car 2 increases and decreases its speed

• Car 1 stays constant and Car 2 changes its speed during the trip

• Car 2 stays constant and Car 1 changes its speed during the trip

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What must be true of the box's motion?

• It is accelerating to the left

• It is slowing down

• It is moving to the right

• It isn't accelerating.

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With no forces acted upon it, an object at rest will stay at rest and an object in motion will stay in motion

• Newton's 1st Law of Motion

• Newton's 2nd Law of Motion

• Newton's 3rd Law of Motion

The acceleration of an object depends on the net force and acting on it and the mass of the object. F = ma

• Newton's 1st Law of Motion

• Newton's 2nd Law of Motion

• Newton's 3rd Law of Motion

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The graph below shows an object’s position in meters (m) over time in seconds (s) as it travels in a straight line. The object starts at rest. Identify whether there are balanced or unbalanced forces acting on the object during each time interval. Between 1-2 seconds ​ (a)   Between 3-4 seconds ​ (b)   Between 5-7 seconds ​ (c)  

• Balanced Forces

• Unbalanced Forces

Answer explanation

Remember, if the line is curved, the forces are unbalanced!

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A box is moving toward the right. Two forces act on the box: a force pushing the box to the right and a friction force. The two forces acting on the box are shown in the four force diagrams. Identify whether the speed of the box in each diagram will decrease, increase or remain constant.

c

Speed decreases

Speed increases

Speed remains constant

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A box is moving toward the right. Two forces act on the box: a force pushing the box to the right and a friction force. The two forces acting on the box are shown in the four force diagrams. Identify whether the speed of the box in each diagram will decrease, increase or remain constant.

b

Speed increases

Speed decreases

Speed remains constant

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This is the free-body diagram of a box. Someone is trying to push the box, but it is too heavy. Which arrow represents gravity?

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When soccer legend Megan Rapinoe kicks the ball,

her ​ (a)   pushes the object right, but ​ (b)   pushes the object left.

• applied force

• friction

• gravity

• normal force

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The diagram shows a blue object in different fields. The arrow represents a force acting on the object in each field. 

Move a label to each blank box to identify the property that could change so that the force acting on the object is altered. 

Use only one label in each blank box. 

You do not need to use all of the labels. 

b

c

Mass

Magnetism

Charge

Volume

Answer explanation

Gravity is affected by the size of objects (mass) and the distance between objects.

The electric field strength is dependent upon the quantity of charge and the distance from the charge.

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