What is a force that opposes motion between two surfaces?

• friction

• acceleration

• velocity

• motion

The picture of the position vs. time graph shows an object that is...

• accelerating/speeding up

• moving at a constant speed 

• not moving 

• accelerating/slowing down. 

Tags

NGSS.MS-PS3-1

A push or pull that causes an object to move, stop, or change direction.

• force

• motion

• energy

• inertia

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NGSS.MS-PS2-1

NGSS.MS-PS2-2

What is the net force on the block? (click on the words to view the picture)

• 5 Newtons up

• 5 Newtons down

• 15 Newtons up

• 15 Newtons down

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NGSS.MS-PS2-1

NGSS.MS-PS2-2

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?

Tags

NGSS.MS-PS2-4

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!

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

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

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

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 decreases

Speed remains constant

Speed increases

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

Match the following

• A push or pull required to

  move an object

• Force

• An opposing force against objects moving through the air

• Mass

• The force that attracts

  two objects with mass

  toward each other.

• Air Resistance

• A measure of the gravitational force between objects

• Weight

• The amount of matter contained in an object or substance

• Gravity

Tags

NGSS.MS-PS2-2

NGSS.MS-PS2-4

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

Mass

Charge

Magnetism

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.

Tags

NGSS.MS-PS2-2

NGSS.MS-PS2-3

NGSS.MS-PS2-4