Physics Y10 Forces 2 EoT test

Question 1

formula for momentum

Answer 1

momentum = mass * velocity

Question 2

what is momentum

Answer 2

a measure of the tendency of an object to keep moving or how hard it is to stop moving

Question 3

what is momentum measured in

Answer 3

kilogram metres per second (kgm/s)

Question 4

what is the conservation of momentum law

Answer 4

total momentum before is equal to total momentum afterwards, unless acted on by an external force

Question 5

what is an impact force

Answer 5

a force causing a change in momentum to an object

Question 6

formula for impact force

Answer 6

force = change in momentum/time

Question 7

what is the stopping distance

Answer 7

how far a vehicle travels until it stops

Question 8

how do you calculate stopping distance

Answer 8

thinking distance + braking distance

Question 9

what factors affect thinking distance

Answer 9

• speed of vehicle
• how intoxicated the driver is
• the driver’s concentration

Question 10

what factors affect the braking distance

Answer 10

• speed of vehicle
• mass of vehicle
• condition of brakes
• condition of tyres
• condition of road

Question 11

what are stopping distances for 20 mph

Answer 11

6m thinking, 6m braking

Question 12

what are stopping distances for 30 mph

Answer 12

9m thinking, 14m braking

Question 13

what are stopping distances for 40 mph

Answer 13

12m thinking, 24m braking

Question 14

what are stopping distances for 50 mph

Answer 14

15m thinking, 38m braking

Question 15

what are stopping distances for 60 mph

Answer 15

18m thinking, 55m braking

Question 16

what are stopping distances for 70 mph

Answer 16

21m thinking, 75m braking

Question 17

how will increased viscosity affect terminal velocity

Answer 17

it will decrease

Question 18

how will decreased mass affect terminal velocity

Answer 18

it will decrease

Question 19

what is terminal velocity

Answer 19

the velocity reached by an object when the drag force on it is equal and opposite to the force making it move

Question 20

what is Hooke’s law

Answer 20

the more force that is put on materials, the more they extend

Question 21

when is Hooke’s law true

Answer 21

as long as the elastic limit is not exceeded

Question 22

what happens after the elastic limit is exceeded

Answer 22

the material no longer hows elastic behaviour and is permanently deformed (does not return to original position when force is removed)

Question 23

equation for Hooke’s law

Answer 23

force = extension * spring constant

Question 24

what does a higher spring constant mean

Answer 24

stiffer spring

Question 25

what axes do force and extension go on on a graph

Answer 25

force - y axis, extension - x axis

Question 26

what does the gradient on a force-extension graph show

Answer 26

the spring constant

Question 27

what does a steeper curve mean on a force-extension graph

Answer 27

a stiffer spring

Question 28

what is a lever

Answer 28

a long bar that pivots

Question 29

what happens when you apply a force to one side of a lever

Answer 29

the other side moves up

Question 30

how is using a lever helpful

Answer 30

it can magnify forces, making objects easier to move

Question 31

what is a moment

Answer 31

a turning force

Question 32

formula for moment

Answer 32

force * perpendicular distance from pivot

Question 33

units for moment

Answer 33

newton metres (Nm)

Question 34

what can gears do

Answer 34

• increase speed
• increase force
• change direction

Question 35

what happens as force increases on a gear and why

Answer 35

speed decreases because work done = force * distance (work done stays same, so distance has to decrease)

Question 36

what will a bigger gear do

Answer 36

higher force, lower speed

Question 37

what will a smaller gear do

Answer 37

lower force, higher speed

Question 38

what directions do two touching gears go

Answer 38

in opposite directions

Question 39

+centre of mass stuffs