linear motion

Question 1

linear motion

Answer 1

movement of a body in a straight line with all body parts moving the same distance and direction over the same time

Question 2

linear motion example

Answer 2

a water skier being pulled at constant speed will travel in linear motion as all parts of their body travel in the same direction over the same distance per unit of time

Question 3

where is the force applied for linear motion to occur

Answer 3

through the centre of mass

Question 4

scalar quantities

Answer 4

have magnitude only

Question 5

scalar quantities examples

Answer 5

• mass
• inertia
• distance
• speed

Question 6

vector quantities

Answer 6

have magnitude and direction

Question 7

vector quantities examples

Answer 7

• weight
• acceleration
• deceleration
• displacement
• velocity
• momentum

Question 8

distance

Answer 8

total length of the path covered from start to finish

Question 9

displacement

Answer 9

shortest straight line route from start to finish

Question 10

speed

Answer 10

the rate of chnage of direction (m/s)

Question 11

speed formula

Answer 11

speed = distance / time taken

Question 12

velocity

Answer 12

the rate of change in displacement (m/s)

Question 13

velocity formula

Answer 13

velocity = displacement / time taken

Question 14

acceleration

Answer 14

the rate in change of velocity (m/s2)

Question 15

acceleration formula

Answer 15

acceleration = (final velocity - initial velocity) / time taken

Question 16

deceleration

Answer 16

occurs when the rate of change in velocity is negative or there is a decrease in velocity over time

Question 17

momentum

Answer 17

measurement of the amount of motion an object has (kgm/s)

Question 18

momentum formula

Answer 18

momentum = mass x velocity

Question 19

what does a distance time graph show

Answer 19

speed

Question 20

what does a displacement time graph show

Answer 20

velocity

Question 21

what does a velocity time graph show

Answer 21

acceleration

Question 22

when might a body’s state of motion get quicker?

Answer 22

when diving off the block or pushing off the wall after a turn in swimming

Question 23

when might a body’s state of motion get slower?

Answer 23

when going into a turn or in the middle of a distance race in swimming

Question 24

what causes changes in speed and direction?

Answer 24

external unbalenced forces

Question 25

force

Answer 25

a push or pull that alters the state of motion of a body (N)

Question 26

force formula

Answer 26

force = mass x acceleration

Question 27

what are the 2 types of force

Answer 27

internal
external

Question 28

internal force

Answer 28

a force that originates inside the body e.g. contraction of muscles

Question 29

external force

Answer 29

a force acting that originates outside of the body e.g. gravity

Question 30

external force examples

Answer 30

• gravity
• friction
• air resistance
• inertia

Question 31

gravity

Answer 31

force that pulls objects back down to earth

Question 32

friction

Answer 32

objects moving against each other in opposition cause friction

Question 33

air resistance

Answer 33

friction caused by air moving over a surface

Question 34

inertia

Answer 34

the reluctance of a body to change its state of motion