What do you need to move a soccer ball?

• Friction

• Gravity

• Inertia

• Force

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Which of these is an example of force?

• Watching a slice of bread in the toaster

• Pulling a casserole out of the oven

• Listening to your school music chorus

• Taste tasting soup cooking on the stove top

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NGSS.MS-PS2-1

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What is the name of the unit you use to measure force?

• Neutron

• Norton

• Newton

• Narley

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Your older brother tells you his paper airplane has inertia. What does this mean?

• It has too much resistance to fly more than a few feet from his hand.

• It is too heavy to stay in the air for more than a few seconds.

• It will require a lot of force to get it to fly.

• It will stay in flight unless something stops it, or it will stay still unless something moves it.

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 remains constant

Speed increases

Speed decreases

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NGSS.MS-PS2-1

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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 remains constant

Speed increases

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NGSS.MS-PS2-1

NGSS.MS-PS2-2

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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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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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

Volume

Magnetism

Mass

Charge

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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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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NGSS.MS-PS2-2