Grade 9 Mid Unit Review

Which phrase states the Law of Conservation of Energy?

• Ability to do both physical and mental work

• particles can neither be created or destroyed, only transferred from one form to another

• causes an object to move faster, in a straight line or slow down.

• microscopic particles are always in random motion

What type of lever is a nut cracker?

• 1st

• 2nd

• 3rd

• 4th

A science class investigating how to make work easier, designs the machine shown. Which two simple machines did they use?

• inclined plane and pulley

• lever and inclined plane

• pulley and wedge

• wedge and screw

Which equation is used to calculate scientific work?

• work = force / distance

• work = distance /force

• work = force x distance

• work = power x force

What is the scientific unit for work?

• Newton

• Joule

• Pascal

• Meter

What is energy?

• The ability to do work

• An immovable force

• the potential power

• work

Define temperature.

• heat

• power in

• how hot or how cold

• the potential energy

Which natural resource is renewable?

• coal

• gas

• oil

• sunlight

Which will transfer heat by conduction only?

• A metal pot

• a hair dryer

• sunlight

• boiling water

How do ocean currents transfer heat?

• conduction

• convection

• radiation

• evaporation