science vocab

Question 1

science

Answer 1

the study of nature

Question 2

physical science

Answer 2

the study of matter and energy

Question 3

matter

Answer 3

anything that has mass and volume (takes up space)

Question 4

energy

Answer 4

the ability to do work or cause change

Question 5

mass

Answer 5

the amount of matter in an object

Question 6

work

Answer 6

the transfer of energy in which a force is put on an object and the object moves in the direction of the force

Question 7

scientific method

Answer 7

a set of steps used to solve a problem

Question 8

hypothesis

Answer 8

an educated guess based made from previous observations and knowledge

Question 9

volume

Answer 9

the amount of space an object takes up

Question 10

variable

Answer 10

any factor that can make a change in the results of an experiment

Question 11

technology

Answer 11

the application of science to help people

Question 12

theory

Answer 12

an explanation of an event based on observations and experiment

Question 13

law

Answer 13

a statement that tells us what happens in an event

Question 14

temperature

Answer 14

the measure of the average kinetic energy of the atoms in an object

Question 15

density

Answer 15

mass per unit volume of a material

Question 16

model

Answer 16

something created to represent an idea

Question 17

graph

Answer 17

a visual display of information used to explain an idea of concept

Question 18

speed

Answer 18

the distance an object travels over a period of time

Question 19

velocity

Answer 19

the distance an object travels over time and the objects direction

Question 20

acceleration

Answer 20

the change in velocity of an object over time

Question 21

g

Answer 21

the acceleration of a falling object due to gravity in a vacuum (9.8 m/s)

Question 22

momentum

Answer 22

a property of an object based on the object’s mass and velocity

Question 23

projectile

Answer 23

any object thrown/shot through the air

Question 24

gravity

Answer 24

a force between any objects dependent on the mass of the objects, often defined as a downward force on all objects

Question 25

force

Answer 25

any push or pull on an object

Question 26

balanced force

Answer 26

equal forces but in opposite direction (Net force will be zero)

Question 27

unbalanced force

Answer 27

a force that is greater in one direction (Net force will be greater than zero)

Question 28

Net force

Answer 28

the sum of all the forces acting on an object

Question 29

friction

Answer 29

the force that opposes the motion between two surfaces in contact

Question 30

vacuum

Answer 30

an area without air

Question 31

air resistance

Answer 31

the friction caused by the force of air acting on an object opposing the objects motion

Question 32

terminal velocity

Answer 32

the highest velocity a falling object will reach due to the forces of gravity and air resistance becoming balanced

Question 33

inertia

Answer 33

the resistance of an object to any change in its motion (often talked about with Newton's first law of Motion)

Question 34

free-fall

Answer 34

when an object falls free from air resistance

Question 35

weight

Answer 35

the measurement of the gravitational force of an object's mass

Question 36

centripetal force

Answer 36

a force from the center that makes an object move in a curved or circular path

Question 37

machine

Answer 37

a device used to make work easier

Question 38

power

Answer 38

the rate at which work is done

Question 39

efficiency

Answer 39

a measure of how much work put into a machine is changed into useful work output by the machine

Question 40

ideal machine

Answer 40

a theoretical machine in which the (Win) amount of work put into the machine is equal to the (Wout) work you get out of the machine (Win=Wout)

Question 41

mechanical advantage

Answer 41

a machine's ability to make work easier by making output force (Fout) greater than input force (Fin)

Question 42

kinetic energy

Answer 42

the energy of an object due to the object's motion

Question 43

potential energy

Answer 43

the energy of an object at rest or energy stored by an object

Question 44

calorie

Answer 44

a unit that measures the energy in food

Question 45

thermal energy

Answer 45

the total energy of an object including both kinetic (temperature) and potential (mass)

Question 46

nuclear fusion

Answer 46

the production of energy from the collisions between nuclei of atoms

Question 47

nuclear fission

Answer 47

the production of energy from the splitting of a uranium nuclei

Question 48

fossil fuels

Answer 48

the energy sources found within the earth formed from the decay of plants and animals millions of years ago

Question 49

renewable energy resource

Answer 49

energy resources that can be produced as quickly as they are used

Question 50

non-renewable energy resources

Answer 50

resources that are used up quicker than they can be made

Question 51

photovoltaic cells

Answer 51

devices that convert light energy to electricity (as seem on solar calculators)