liner motion

Question 1

distance (m) define and formula

Answer 1

total length of space between a start point and an end point

D=SXT

Question 2

mass (kg) define and formula

Answer 2

the amount of matter of an object

m=fxa

Question 3

weight (N) define and formula

Answer 3

force that gravity applies to an object

W=mx9.81

Question 4

momentum (Kgm/s)define and formula

Answer 4

the amount of motion on an object

m = mass x velocity

Question 5

displacement (m) define and formula

Answer 5

total change in an objects original position

D = velocity x time

Question 6

speed (m/s) define and formula

Answer 6

the rate at which an object travels a specified distance

distance / time

Question 7

velocity (m/s) define and formula

Answer 7

the rate at which an object undergoes displacement

distance / time

Question 8

acceleration (m/s-2) define and formula

Answer 8

positive change in the velocity of an object

change in velocity / time

Question 9

deceleration (m/s-2) define and formula

Answer 9

negative change in velocity of an object

change in velocity / time

Question 10

scalar quantity define and examples

Answer 10

measurements only described in terms of size e.g. mass distance speed

Question 11

vector quantity define and examples

Answer 11

measurements described in terms of magnitude and direction e.g. weight acceleration displacement velocity and momentum

Question 12

impulse define and formula

Answer 12

change in momentum of a body as a result of a force

force x time

Question 13

static friction

Answer 13

force exerted on one surface by another when there is no motion between 2 surfaces

Question 14

sliding friction

Answer 14

2 bodies in contact with one another that may have tendency to slip

Question 15

3 factors affecting friction

Answer 15

• surface characteristics e.g. spikes
• temperature of surfaces e.g. curling
• mass of objects e.g. increased mass increases friction

Question 16

friction

Answer 16

occurs when 2 or more bodies are in contact with one another

resistance that one object encounters when moving over another

Question 17

air resistance

Answer 17

a force that acts in the opposite direction to the motion of a body travelling through air

Question 18

3 factors air resistance depends upon

Answer 18

1. velocity of body - the faster the more air resistance
2. cross-sectional area - increased CSA increases AR
3. shape and surface characteristics e.g. streamline and hair

Question 19

unbalanced

Answer 19

force in one direction is larger than a force acting in opposite direction

Question 20

explain vector diagram for high jump

Answer 20

large internal muscular force from legs create big action/ reaction force to achieve high vertical displacement

Question 21

reaction force

Answer 21

occurs when 2 bodies are in contact with one another

Question 22

what is the effect of increase impulse on the rate of change of momentum

Answer 22

the rate of change of momentum will increase

Question 23

how does impulse affect speed

Answer 23

impulse can be used to add speed to an object or slow object down

Question 24

using impulse to increase momentum is achieved by:

Answer 24

• increasing the amount of muscular force

- increasing amount of time in which force is applied

Question 25

using impulse to decrease momentum is achieved by:

Answer 25

• increasing time forces acting upon them e.g. slowing down after 60m sprint by increasing contact time of foot on the ground

Question 26

net impulse define

Answer 26

a combination of positive and negative impulses

Question 27

ground reaction force

Answer 27

force exerted by the ground on a body in contact with it.