Which causes the most friction?

• rolling a tennis ball down a cardboard box
• rolling a marble down a cardboard box
• rolling a tennis ball across carpet
• rolling a marble across carpet

How can you reduce friction to a surface? 

• add bumps
• add carpet
• add sand
• add oil

Movers slide a box down the ramp of a truck.
What helps slow the box as it slides to the bottom of the ramp?

• friction
• gravity
• inertia
• magnetism

Tags

NGSS.MS-PS2-2

Why is it important for basketball players to wear shoes with tread when playing?

• to increase the speed of the player
• to decrease the force between the player and the floor
• to increase friction between the floor and the player’s feet
• to decrease the amount of force needed for the player to move

Which best describes the role friction plays in the operation of a car?

• Friction makes a car go faster.
• Friction keeps a car from stopping.
• Friction turns the car in a new direction.
• Friction helps a car slow down and stop.

Which material should be used on a bicycle ramp to increase friction?

• shiny metal
• rough paper
• smooth wood
• wet plastic

Tags

NGSS.MS-ETS1-2

Why is it important to use oil in machinery? 

• because friciton causes the parts to become frozen
• because friction causes the parts to to heat up