Exploring Forces

Which of the following best describes friction?

• A force that acts in the same direction as motion

• A force that opposes motion between two surfaces in contact

• A force that acts at a distance

• A force that increases speed

If you slide a book across a table, what type of friction is acting between the book and the table?

• Static friction

• Sliding friction

• Rolling friction

• Fluid friction

A car is moving at a constant speed on a straight road. What can be said about the forces acting on the car?

• The forces are balanced

• The forces are unbalanced

• There are no forces acting on the car

• The force of gravity is greater than the frictional force

Tags

NGSS.MS-PS2-2

How does increasing the mass of an object affect its weight?

• The weight decreases

• The weight remains the same

• The weight increases

• The weight becomes zero

Tags

NGSS.MS-PS2-4

Which of the following scenarios involves unbalanced forces?

• A book resting on a table

• A car accelerating on a highway

• A satellite orbiting Earth at constant speed

• A person standing still

Tags

NGSS.MS-PS2-2

Explain why a ball thrown in the air eventually falls back to the ground.

• Because of air resistance

• Due to the force of gravity pulling it down

• Because it loses energy

• Due to the force of friction

Tags

NGSS.MS-PS2-4

A box is pushed across a floor with a force of 10 N, but it does not move. What can be inferred about the frictional force?

• The frictional force is less than 10 N

• The frictional force is equal to 10 N

• The frictional force is greater than 10 N

• There is no frictional force

A student drops two objects of different masses from the same height in a vacuum. Which object will hit the ground first?

• The heavier object

• The lighter object

• Both will hit the ground at the same time

• It depends on the shape of the objects

Tags

NGSS.MS-PS2-4

A toy car is pushed and then released. It eventually comes to a stop. Which force is primarily responsible for stopping the car?

• Gravity

• Friction

• Air resistance

• Magnetic force

Tags

NGSS.MS-PS2-2

A person is pushing a box with a force of 15 N to the right, and friction is acting with a force of 10 N to the left. What is the net force on the box?

• 5 N to the right

• 5 N to the left

• 25 N to the right

• 25 N to the left

Tags

NGSS.MS-PS2-2