motion vocab

Question 1

acceleration

Answer 1

rate of change of velocity

Question 2

deceleration

Answer 2

slowing down / negative acceleration

Question 3

inertia

Answer 3

the tendency of an object to resist a change motion

Question 4

law of conservation of momentum

Answer 4

the total momentum in an isolated system does not change during a collision

Question 5

magnitude

Answer 5

the size or extent of something

Question 6

momentum

Answer 6

how difficult it is to stop a moving object
P = mv

Question 7

net force (also known as resultant force)

Answer 7

vector sum of all forces acting on an object

Question 8

newton’s first law

Answer 8

an object in motion will stay in motion unless acted on by an unbalanced force

Question 9

newton’s second law

Answer 9

the mass of an object affects the way it moves when acted on by one or more forces
F = ma

Question 10

newton’s third law

Answer 10

every action has an equal and opposite reaction

Question 11

reaction force

Answer 11

the force acting in the opposite direction

Question 12

scalar quantity

Answer 12

only has size

Question 13

vector quantity

Answer 13

has size and direction

Question 14

speed

Answer 14

the distance travelled per unit of time

Question 15

velocity

Answer 15

speed in a specific direction

Question 16

distance

Answer 16

measurement of how far something travels

Question 17

displacement

Answer 17

measurement of the straight-line distance between the finishing and starting points

Question 18

what is a ticket timer?

Answer 18

a ticket timer is used to measure speed

Question 19

how does a ticket timer work?

Answer 19

it’s accelerating if the dots are spread apart
if it’s at a constant speed, the dots are evenly spread
if it’s at a slow speed, the dots will be close together

Question 20

list 2 ways momentum can be increased

Answer 20

• increasing velocity
• increasing mass