'25 Physical Science Final

What is the definition of CONVECTION

• When heat transfers through waves.

• a hot liquid or air that expands, becomes less dense, and rises or becomes more dense, and sinks.

• When heat transfers from objects that are touching.

• Heat traveling from the sun

A hammer falls off a rooftop and strikes the ground with a certain kinetic energy. How would its kinetic energy compare if it fell from a roof twice as tall?

• It would have half the kinetic energy.

• The kinetic energy would be the same

• The kinetic energy would increase 9.8 m/s^2 more

• The kinetic energy would double.

A student pushes their textbook across a desk. Which type of force is primarily responsible for slowing the book down? Mark only one oval.

• Normal force

• Applied force

• Friction

• Air resistance

Type of energy transformed into thermal energy in a toaster

• power

• friction

• kinetic

• radiant

• electricity

a substance that slows down the transfer of heat

• A. conduction

• B. convection

• C. conductor

• D. insulator

Force that acts between two sticks when they are rubbed together. Mark only one oval.

• kinetic

• power

• radiant

• friction

• conservation

Type of energy that is greatest at the top of a swing's path. Mark only one oval.

• friction

• radiant

• power

• kinetic

• potential

Type of energy transformed into chemical energy by plants. Mark only one oval.

• friction

• power

• conservation

• radiant

• kinetic

Which category of forces requires direct physical contact between objects?

• Non-contact forces

• Magnetic forces

• Contact forces

• Gravitational forces

The number of times a machine multiplies the effort force is the ________________ of the machine

• Conservation of Energy

• chemical

• simple machines

• friction

• mechanical advantage