Chapter 12 Work & Machines

Question 1

Work

Answer 1

Force exerted on an object that causes it to move

Question 2

Joule

Answer 2

The unit of measurement for work

Question 3

Power

Answer 3

The rate at which work is done

Question 4

Machine

Answer 4

Makes work easier by changing one of the following: amount of force you exert, the distance over which you exert your force, or the direction in which you exert your force

Question 5

Mechanical Advantage

Answer 5

The number of times a machine increases a force exerted on it

Question 6

Inclined Plane

Answer 6

A flat, sloped surface

Question 7

Wedge

Answer 7

A device that is thick at one end and tapers to a thin edge at the other end

Question 8

Screw

Answer 8

An inclined plane wrapped around a cylinder

Question 9

Lever

Answer 9

A rigid bar that is free to pivot, or rotate, on a fixed point

Question 10

Fulcrum

Answer 10

The fixed point that a lever pivots around

Question 11

Wheel and axle

Answer 11

A simple machine made of two circular or cylindrical objects fastened together that rotate around a common axis

Question 12

Pulley

Answer 12

A simple machine made of a grooved wheel with a rope or cable wrapped around it

Question 13

Compound Machine

Answer 13

A machine that utilizes two or more simple machines