Physical Science Forces and Motion Review

A passenger walks 4 km per hour toward the front of a train that is moving 50 km per hour. What is her motion relative to someone standing next to the tracks as the train passes by.

• She is not moving

• She is moving 4 km per hour

• She is moving 50 km per hour

• She is moving 54 km per hour

A ball is dropped from the top of a tall building. As the ball falls, the upward force of drag becomes equal to the downward pull of gravity. When these two forces become equal in magnitude, the ball will

• flatten due to the forces.

• fall at a constant speed.

• continue to speed up

• slow to a stop.

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The diagram shows a car on a track that is lying on the floor. Identify the net force when the car is at rest.

• Zero Net Force

• Arrow Up

• Arrow Right

• Arrow Down

• Arrow Left

The diagram shows a car on a track that is lying on the floor. Identify the net force when the car begins to move forward.

• Zero Net Force

• Arrow Up

• Arrow Right

• Arrow Down

• Arrow Left

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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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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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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 increases

Speed remains constant

Speed decreases

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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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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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Match the following

• An opposing force against objects moving through the air

• Mass

• The amount of matter contained in an object or substance

• Gravity

• A measure of the gravitational force between objects

• Force

• A push or pull required to

  move an object

• Weight

• The force that attracts

  two objects with mass

  toward each other.

• Air Resistance

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