Forces and Motion

If a pencil is let go from my hand, what will gravity cause it to do?

• float upwards

• move sideways

• spin

• fall downwards

Tags

NGSS.MS-PS2-4

If I hit the brakes on my car, I increase friction between the tires and the road, which causes what to happen?

• My car turns into a flying car.

• My car speeds up or accelerates.

• My car slows down and eventually stops.

• My cars stays moving at the same speed.

Tags

NGSS.MS-PS2-2

Why is it easier to lift a plate compared to a table?

• The plate has less mass, which means less force is needed to move it.

• The table has less mass, which means less force is needed to move it.

• It is not easier to lift a plate. It is easier to lift a table.

• I have more friction when I lift a plate.

Tags

NGSS.MS-PS2-2

NGSS.MS-PS2-4

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-PS2-2

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-PS2-2

A student wants to determine the amount of force needed to move a 100 gram block across 4 surfaces: a rug, glass, grass and concrete. Choose the best answer for Part A and Part B.

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

A force that opposes the motion of an object is called (a)   .

• friction

• gravity

• heat

Answer explanation

A force that opposes the motion of an object is called friction. It acts in the opposite direction to the movement, slowing down or stopping the object. Gravity pulls objects down, while heat is not a force.

Tags

NGSS.3-PS2-1

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-PS2-1

NGSS.MS-PS2-2

A student is investigating the number of times 4 different balls bounce when dropped on the gym floor. The data table is shown. Choose the correct classification for each variable as independent, dependent, or constant.

Drop height - ​ (a)  

Ball - ​ (b)  

Surface - ​ (c)  

Bounces - ​ (d)  

• constant

• independent

• dependent

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

Charge

Magnetism

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.

Tags

NGSS.MS-PS2-4

NGSS.MS-PS2-5