Chapter 12 Work And Energy

Question 1

Work

Answer 1

Transferring of energy to a body by the use of force that causes the body to move in the direction of the force

Question 2

Power

Answer 2

Quantity that measures the rate of how work is done or energy is transformed

Question 3

Mechanical advantage

Answer 3

Tells yo how much a machine multiplies force or increases the distance

Question 4

Joule

Answer 4

How energy is measured

Question 5

Watt

Answer 5

Measurement of power

Question 6

Simple machines

Answer 6

The most basic machines

Question 7

Compound machines

Answer 7

A machine that is made of more than one simple machine

Question 8

Lever

Answer 8

Machine that have a rigid arm that turns around at a point and where force is transferred from one part to another

Question 9

First class lever

Answer 9

Levers that have a fulcrum that is between the points of application of the input and output forces

Question 10

Second class lever

Answer 10

Levers where the fulcrum is arm one end of the arm and the input force is applied to the other end

Question 11

Third class levers

Answer 11

Levers that multiply distance rather than force

Question 12

Pulley

Answer 12

Modified lever that is used to lift things

Question 13

Block and tackle

Answer 13

A single unit where multiple pulleys that are put together

Question 14

Wheel and axel

Answer 14

A lever that is connected to a shaft

Question 15

Inclined plane

Answer 15

Helps turn a small input force into a large output force by spreading the work over a larger distance

Question 16

Wedge

Answer 16

Turns a downward force into two forces directed out to the sides

Question 17

Screw

Answer 17

Helps bind things closer together and keeping them together until you want them apart

Question 18

Potential energy

Answer 18

Energy that an object has because of its position, shape, or condition

Question 19

Kinetic energy

Answer 19

Energy of a moving object due to its motion

Question 20

Mechanical energy

Answer 20

Amount of work an object can do because of its kinetic and potential energies

Question 21

Elastic potential energy

Answer 21

Energy stored in any type of stretched or compressed elastic material

Question 22

Gravitational potential energy

Answer 22

Energy that is stored in the gravitational field that is between any two or more objects

Question 23

Nonmechanical energy

Answer 23

Doesn’t effect systems on large scale

Question 24

Efficiency

Answer 24

The ratio of useful work out to work in

Question 25

Open system

Answer 25

Systems that exchange energy with the space that surrounds them

Question 26

Closed systems

Answer 26

System when the flow of energy into and out of a system is small enough that I could possibly be ignored

Question 27

Perpetual motion machine

Answer 27

Theoretical machines that have complete absence of friction and air resistance