Review: Forces that affect KE

Which of the following objects would be affected by air resistance?

• Child sliding backwards down an icy hill

• Falling paper cup

• Car driving down the highway

• all would be affected

• none would be affected

How is air resistance related to friction?

• Falling objects are the only ones affected by air resistance, but there is no friction.

• Moving objects move past air molecules, rubbing against them, which creates friction.

• Air resistance causes objects to be heavier, increasing friction.

• Air resistance and friction are not related.

The forces of friction on a moving object changes some of its energy into _______________energy.

• electric

• potential

• solar

• thermal

Friction can be reduced by using which of the following? Check all that apply.

• grease

• rough surface

• wheels

• ball bearings

Two children are rolling a ball across the floor to each other. Due to friction, which of the following will reduce the amount of kinetic energy in the rolling ball the most?

• Rolling the ball across hardwood floors

• Rolling the ball across carpet

• Rolling the ball across a tiled floor

A material that reduces the flow of heat by conduction, convection, or radiation is a(n)__________.

• conductor

• radiator

• insulator

• metal

Which statement below describes the difference between a conductor and an insulator of heat?

• Wood is a good conductor, but nor a good insulator

• Metal is a good insulator, but not a good conductor

• A conductor transmits heat very well, while an insulator does not

• An insulator transmits heat very well, while a conductor does not.

A company is designing a pot to boil pasta quickly. They are considering which materials to use for the pot and its handles. Based on what you know about heat transfer, select items that would be good to use for the handles.

• Copper

• Alluminum

• Wood

• Plastic

• Iron

A company is designing a pot to boil pasta quickly. They are considering which materials to use for the pot and its handles. Based on what you know about heat transfer, select items that would be good to use for the pot.

• Copper

• Aluminum

• Wood

• Plastic

• Iron

In what way is friction helpful in our everyday lives?

• brakes on a car

• shoes on the floor

• lighting a match

• all of the above