Physics Pre-test/Post Test

Which of the following best describes Newton’s First Law of Motion?

• A force is needed to keep an object moving

• An object at rest stays at rest, and an object in motion stays in motion unless acted upon by an external force

• Force is equal to mass times acceleration

• For every action, there is an equal and opposite reaction

A 5 kg object is accelerating at 3 m/s². What is the net force acting on the object?

• 8 N

• 5 N

• 15 N

• 3 N

Tags

NGSS.MS-PS2-2

According to Newton’s Third Law, when a bird pushes down on the air with its wings:

• The air pushes the bird up

• The air slows the bird down

• The bird moves forward

• There is no reaction force

Tags

NGSS.MS-PS2-1

A book is resting on a table. What force is responsible for preventing it from falling through the table?

• Gravity

• Normal force

• Friction

• Air resistance

Tags

NGSS.MS-PS2-4

Which of the following has the greatest momentum?

• A stationary truck

• A rolling tennis ball

• A running football player

• A slow-moving bicycle

If the momentum of an object changes, which of the following must have occurred?

• The object’s velocity changed

• The object remained at rest

• The object’s mass changed

• The object’s shape changed

Tags

NGSS.MS-PS3-5

A 2 kg ball moving at 4 m/s collides with a stationary 3 kg ball. After the collision, the two balls move together. What is their final velocity?

• 1.6 m/s

• 2.4 m/s

• 2.0 m/s

• 3.2 m/s

Tags

NGSS.MS-PS2-1

NGSS.MS-PS3-5

What happens to the total momentum in a closed system when two objects collide?

• It decreases

• It remains constant

• It increases

• It becomes zero

Tags

NGSS.MS-PS2-1

Which of the following statements about gravitational force is true?

• It only acts on objects in space

• It is strongest when objects are far apart

• It is always attractive

• It does not affect objects in motion

Tags

NGSS.MS-PS2-4

The force between two charges increases when:

• The charges move farther apart

• The charges become smaller

• The distance between them decreases

• The objects lose their charge

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5