Topic 4

Question 1

What is the thinking distance?

Answer 1

Distance the car travels in the time between the diver noticing the hazard and applying the breaks

Question 2

What two things is thinking distance effected by

Answer 2

Your reaction time

How fast your going

Question 3

What is breaking distance

Answer 3

Distance the car travels during its deceleration whilst the brakes are being applied

Question 4

What four main factors effect braking distance

Answer 4

How fast your going
The mass of vehicle
How good your breaks are
How good the grip is(friction between tyres and road)

Question 5

What three factors effect the grip

Answer 5

Road surface
Weather
Tyres

Question 6

What tyre tread depth is essential for getting ride of water inw et conditions and what is it called

Answer 6

1.6mm

“Aquaplaning”

Question 7

What kind of quantity is momentum

Answer 7

Vector quantity

-has size and direction

Question 8

Momentum is always

Answer 8

Conserved when no other forces act

Question 9

When forces act on an object it causes it to

Answer 9

Change momentum

Question 10

What effects does a larger force have on momentum and acceleration

Answer 10

Faster change of momentum and greater acceleration

Question 11

The longer it takes for the change in momentum

Answer 11

The smaller the force (car crash)

Question 12

What three factors do cars have to increase the time taken for change in momentum

Answer 12

Crumble zones
Seat belts
Air bags

Question 13

What do crumble zones do to increase the time taken for change in momentum

Answer 13

Crumble on impacts increasing time taken for car to stop

Question 14

What do seat belts do do increas time taken for change in momentum

Answer 14

Stretch slightly, increasing time taken for wearer to stop

Reducing four e acting on chest

Question 15

What do air bags do

Answer 15

Slow you down gradually

Question 16

What happens when a force moves an object

Answer 16

Energy is transferred and work is done

Question 17

When work is done it can be both

Answer 17

Useful

Wasted

Question 18

Work is measured in (energy transferred)

Answer 18

Joules

Question 19

Power is

Answer 19

The rate of doing work

Question 20

Power is measured in

Answer 20

Watts or j/s

Question 21

Anything that’s moving has

Answer 21

Kinetic energy

Question 22

name two principles of conserving energy

Answer 22

Energy can never be created or destroyed-only transferred from one form to another
Energy is only useful when it’s transferred from one form to another

Question 23

Give two examples of forms that energy is transferred by

Answer 23

Heat

Sound

Question 24

Describe how heat energy dissipates to surroundings

Answer 24

Is transferred to cooler surroundings, which then become warmer. This causes the energy to become less concentrated- it dissipates

Question 25

What does the principle of conservation of energy say about the total amount of energy when it dissipates

Answer 25

The amount of energy stays the same

Still there but can’t be easily used or gotten back again

Question 26

What is the sum of the distance it takes to stop a car made up of

Answer 26

Thinking distance

Breaking distance

Question 27

Kinetic energy gained=

Answer 27

Gravitational potential energy lost

Question 28

When something falls gravitational potential energy is converted into

Answer 28

Kinetic energy

Further something falls the faster it goes