Question 1

acceleration

Accepted Answer

increasing change in the speed of an object over time.

Question 2

alternating current

Accepted Answer

electricity that regularly reverses, or alternates, its direction of flow.

Question 3

ampere

Accepted Answer

measure of the rate of flow of electrical current.

Question 4

circuit

Accepted Answer

the path electricity follows.

Question 5

conductor

Accepted Answer

substance that allows electrons to flow freely; copper, gold, and aluminum are good conductors of electricity.

Question 6

current electricity

Accepted Answer

electricity caused by flowing electrons; the most important kind of electricity.

Question 7

deceleration

Accepted Answer

decrease or slow down in the speed of an object over time.

Question 8

direct current

Accepted Answer

electricity that always flows in the same direction.

Question 9

draft

Accepted Answer

resistance to movement, such as the resistance a plow has in the soil.

Question 10

electricity

Accepted Answer

the flow of electrons, which are small units of negative electrical charge.

Question 11

energy

Accepted Answer

power needed for body activity - both internal and external; in physics, the ability to do work.

Question 12

force

Accepted Answer

push or pull on an object.

Question 13

heat

Accepted Answer

form of energy that results from the motion of atoms and molecules.

Question 14

heat engine

Accepted Answer

type of engine that burns fuel (gasoline, diesel, etc.) to produce hot gases; an internal combustion engine.

Question 15

horsepower

Accepted Answer

the amount of power used to do 550 foot-pounds of work per second; 746 watts in SI; a way of stating power in engines and other power equipment.

Question 16

hydraulic power

Accepted Answer

compression power that uses the force of a liquid or gas placed under pressure to do work inside a cylinder.

Question 17

inclined plane

Accepted Answer

a straight, sloping surface; a ramp.

Question 18

insulator

Accepted Answer

material that does not conduct electricity; rubber, plastic, and glass are commonly used as insulation.

Question 19

kinetic energy

Accepted Answer

result of an object's mass and motion.

Question 20

Law of Conservation of Energy

Accepted Answer

energy can be neither created or destroyed. Energy can be changed from one form to another, but the different forms of energy in a system always add up to the total amount of energy.

Question 21

lever

Accepted Answer

a rod or bar that rotates on a fulcrum, or pivot point.

Question 22

machine

Accepted Answer

device that helps transmit power, force, and motion.

Question 23

mechanical advantage

Accepted Answer

the way in which machines multiply the force they receive.

Question 24

mechanics

Accepted Answer

division of physics that deals with forces exerted by objects when at rest or moving.

Question 25

motion

Accepted Answer

process of moving or changing position; a part of work and power.

Question 26

optics

Accepted Answer

study of the use of light.

Question 27

physics

Accepted Answer

study of matter and energy and how the two relate to each other.

Question 28

pneumatic power

Accepted Answer

use of compressed air to do work.

Question 29

power

Accepted Answer

the rate at which work is done.

Question 30

pulley

Accepted Answer

a simple machine consisting of a kind of grooved wheel and a rope or belt that provides mechanical advantage in doing work; a special kind of wheel that changes the direction of force using a belt or rope.

Question 31

screw

Accepted Answer

a modified inclined plane; a simple machine.

Question 32

sound

Accepted Answer

result of vibration through a medium, such as air or water, creating waves.

Question 33

speed

Accepted Answer

the rate of motion.

Question 34

thermal energy

Accepted Answer

energy produced by heat.

Question 35

volt

Accepted Answer

measurement of the potential energy of electricity.

Question 36

watt

Accepted Answer

measurement of the amount of electrical energy supplied or used.

Question 37

wedge

Accepted Answer

solid piece of wood or metal that is thick at one end and thin at the other, much like an inclined plane; wedges have sloping surfaces that taper to a point.

Question 38

wheel and axle

Accepted Answer

simple machine that allows rotation and transfer of power. The wheel and the axle turn as one unit.

Question 39

work

Accepted Answer

the moving of an object through a distance when there is some resistance to its movement.

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