__Stopping Distances__

Recall that the stopping distance of a vehicle is made up of the sum of the thinking distance and the braking distance

Demonstrate an understanding of the factors affecting the stopping distance of a vehicle, including:

a) the mass of the vehicle

b) the speed of the vehicle

c) the driver’s reaction time

d) the state of the vehicle’s brakes

e) the state of the road

f) the amount of friction between the tyre and the road surface

Investigate the forces required to slide blocks along different surfaces, with differing amounts of friction

Demonstrate an understanding of the factors affecting the stopping distance of a vehicle, including:

a) the mass of the vehicle

b) the speed of the vehicle

c) the driver’s reaction time

d) the state of the vehicle’s brakes

e) the state of the road

f) the amount of friction between the tyre and the road surface

Investigate the forces required to slide blocks along different surfaces, with differing amounts of friction

__Car Safety __

Use the equation:

momentum (kilogram metre per second, kg m/s) = mass (kilogram, kg) x velocity (metre per second, m/s)

to calculate the momentum of a moving object

Demonstrate an understanding of momentum as a vector quantity

Demonstrate an understanding of the idea of linear momentum conservation

Demonstrate an understanding of the idea of rate of change of momentum to explain protective features including bubble wraps, seat belts, crumple zones and air bags

Investigate how crumple zones can be used to reduce the forces in collisions

Use the equation:

force (newton, N) = change in momentum (kilogram metre per second, kg m/s) / time (second, s)

momentum (kilogram metre per second, kg m/s) = mass (kilogram, kg) x velocity (metre per second, m/s)

to calculate the momentum of a moving object

Demonstrate an understanding of momentum as a vector quantity

Demonstrate an understanding of the idea of linear momentum conservation

Demonstrate an understanding of the idea of rate of change of momentum to explain protective features including bubble wraps, seat belts, crumple zones and air bags

Investigate how crumple zones can be used to reduce the forces in collisions

Use the equation:

force (newton, N) = change in momentum (kilogram metre per second, kg m/s) / time (second, s)

__Work and Power __

Use the equation:

work done (joule, J) = force (newton, N) x distance moved in the direction of the force (metre, m)

E = F x d

Demonstrate an understanding that energy transferred (joule, J) is equal to work done (joule, J)

Recall that power is the rate of doing work and is measured in watts, W

Use the equation:

power (watt, W) = work done (joule, J) / time taken (second, s)

P = E/t

Recall that one watt is equal to one joule per second, J/s

work done (joule, J) = force (newton, N) x distance moved in the direction of the force (metre, m)

E = F x d

Demonstrate an understanding that energy transferred (joule, J) is equal to work done (joule, J)

Recall that power is the rate of doing work and is measured in watts, W

Use the equation:

power (watt, W) = work done (joule, J) / time taken (second, s)

P = E/t

Recall that one watt is equal to one joule per second, J/s