Chpater 12 Work And Energy

Question 1

Work

Answer 1

Energy transfer to a body by a force that makes a body move to the direction the force moves it to.

Question 2

Power

Answer 2

Measures rate work is done

Question 3

Mechanical advantage

Answer 3

Measure the amount a machine multiples distance orforce

Question 4

Joule

Answer 4

Work measured in Newton’s times meters these units called joules

Question 5

Watt

Answer 5

Power’s SI unit

Question 6

Simple machine

Answer 6

Most basic machine out of six types of machines

Question 7

Compound machines

Answer 7

Machine that has more than on simple machine built into it

Question 8

Lever

Answer 8

Claw hammer pulling out nail. Claw does work on nail

Question 9

First class lever

Answer 9

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

Question 10

Second class lever

Answer 10

Fulcrum at one end and input force is put on other end

Question 11

Third class lever

Answer 11

Multiply distance instead of force so third class levers have mechanical advantage less than one.

Question 12

Pulley

Answer 12

Helps lift things also simple machine in the lever family

Question 13

Block and tackle

Answer 13

A hunch of pulleys put together in a single unit

Question 14

Wheel and axle

Answer 14

Lever or pulley that is connected to a shaft. Simple machine

Question 15

Inclined Plane

Answer 15

Turns small input force to large output force by spreading out the work over a big distance

Question 16

Wedge

Answer 16

Simple machine in inclined family that functions like two inclined planes back to back.

Question 17

Screw

Answer 17

Inclined plane wrapped around a cylinder

Question 18

Potential energy

Answer 18

Energy object has because of shape, position, or condition

Question 19

Mechanical energy

Answer 19

Amount of work object can do because of its kinetic and potentially energies

Question 20

Kinetic energy

Answer 20

Energy that object has when moving

Question 21

Elastic potential energy

Answer 21

Stored up energy in stretchy material

Question 22

Gravitational potential energy

Answer 22

Stored energy in object above the ground

Question 23

Nonmechanical energy

Answer 23

Energy lies at level of atoms and doesn’t affect motion

Question 24

Efficiency

Answer 24

Measures ratio of useful work output to work input

Question 25

Closed system

Answer 25

When flow of energy into and out of system is so tiny

Question 26

Open system

Answer 26

Exchanges energy with the space that surrounds them