Unit 12 science vocab

Question 1

compound machine

Answer 1

machine is a combination of 2 or more simple machines

Question 2

efficiency

Answer 2

ratio of output work done by machine to input of work done by machine, (expressed as a percentage)

Question 3

machine

Answer 3

device makes work easier, increases force on object, changing the direction of applied force, increasing distance over force applied

Question 4

mechanical advantage

Answer 4

ratio of ouput of force exerted by a machine to input force applied to machine

Question 5

simple machine

Answer 5

machine that does work with only one movement, (EX: lever, pulley, wheel and axel, inclined plane, screw and wedge

Question 6

work

Answer 6

transfer of energy when a force is applied over a distance, measured in joules

Question 7

chemical potential energy

Answer 7

energy that is due to chemical bonds

Question 8

elastic potential energy

Answer 8

energy that is stored by compressing/stretching an object

Question 9

energy

Answer 9

the ability to cause change, measured in joules

Question 10

gravitational potential energy

Answer 10

energy that is due to the gravitational force between objects

Question 11

kinetic energy

Answer 11

energy a moving object has because of its motion, determine by the Mass and speed of the object

Question 12

potential energy

Answer 12

energy that is stored due to the interactions between objects

Question 13

system

Answer 13

a region or set of regions around which a boundary can be defined

Question 14

law of conservation of energy

Answer 14

states that charge can be transferred from one object to another (cannot be created or destroyed)

Question 15

mechanical energy

Answer 15

sum of potential energy and kinetic energy of objects in a system

Question 16

power

Answer 16

rate at which energy is converted, measured in watts