7.0 glossary

Question 1

acceleration

Answer 1

increase in speed

Question 2

deceleration

Answer 2

decrease in speed

Question 3

force

Answer 3

push pull or a twist that can change an objects motion

Question 4

inertia

Answer 4

tendency of an object to resist any change in motion

Question 5

newton (N)

Answer 5

unit used to measure force

Question 6

air resistance

Answer 6

(or drag) friction that acts on an object moving through the air

Question 7

contact force

Answer 7

force that acts between two objects that touch or are in contact e.g friction

Question 8

friction

Answer 8

force that act against an objects motion

Question 9

lubricants

Answer 9

fluid such as oil used to reduce friction between moving parts

Question 10

force field

Answer 10

region of space in which an object will experience a non-contact force

Question 11

gravitation field

Answer 11

region of space in which an object will experience a force due to gravity

Question 12

gravity

Answer 12

force of attraction between two objects e.g. earth and person

Question 13

mass

Answer 13

the amount of matter in a substance (kg)

Question 14

non-contact force

Answer 14

force that acts on an object from a distance

Question 15

terminal velocity

Answer 15

the point at which a falling body cease to accelerate but falls at a constant speed, because its weight is balanced by air resistance (drag)

Question 16

weight

Answer 16

the force of gravity pulling on an object measured in newtons

Question 17

atoms

Answer 17

tiny particles that make up all matter

Question 18

static electricity

Answer 18

a build up of electric charge