Physical Science Chapter 4

The SI unit for energy is

• Calorie

• Joule

• Meter per second

• Kilogram

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What is the proper unit for gravitational potential energy?

• Gravitons

• Newtons

• Joules

• Meters

Which of the following devices does not make use of electrical energy?

• upright piano

• radio

• toaster

• digital camera

Which is not a simple machine?

• pulley

• ramp

• wood screw

• bicycle

According to the law of conservation of energy, the total amount of energy in the universe______.

• remains constant

• changes constantly

• increases

• decreases

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The unit of power is the ______.

• second

• m/s

• watt

• joule

A device that does work with only one movement and changes the size or direction of a force is a(n) _____.

• compound machine

• screw

• effort machine

• simple machine

The amount by which a machine multiplies an effort force is called the_____.

• fulcrum

• efficiency factor

• mechanical advantage

• resistance force

When two or more simple machines work together, they are called a(n)_______.

• compound machine

• effort machine

• screw

• multiple machine

At what point on a roller coaster is the gravitational potential energy (GPE) the lowest?

• at the top of the highest drop

• at the lowest point of the roller coaster

• while on the decline

• while on the incline

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