What is the equation for speed?
time / distance
change in speed / time taken
time x distance
distance / time
A steeper slope means a slower speed
What is acceleration?
speed of an object in a certain direction
the change in speed per second
the time taken for a change in speed
frictional force that acts on a moving object
What are forces measured in?
Newtons (N)
Kilograms (kg)
Watts (W)
Joules (J)
How can thinking distance be increased?
icy/wet road conditions
tiredness
worn brakes or tyres
mass of vehicle
What is the equation for stopping distance?
thinking distance x braking distance
thinking distance + braking distance
braking distance / stopping distance x100
stopping distance - thinking distance
Work is done whenever a force moves an object
What is power measured in?
Joules ( J )
Newtons ( N )
Kilograms ( kg )
What is kinetic energy?
energy when you stand still
energy an object has because of its movement
increased speed of an object
a force of attraction between masses
Cars with a greater kinetic energy will have a lower braking distance
What do seatbelts do?
cushion the impact for the driver and passengers
absorb energy and break to avoid the driver being impaled during an accident
prevent people in the car from being propelled forwards
be a part of the car designed to crumple up during a collision
What do air bags do?
be the part of the car designed to crumple up during a collision
What do crumple zones do?
cushion the impact for the drivers and passengers
What is the equation for momentum?
mass x acceleration
mass x velocity
force / time taken
mass / acceleration
At higher speeds, falling objects experience more drag
When a skydiver jumps out of an aeroplane, what does he initially do?
deaccelerate due to air resistance
accelerate due to the force of gravity
accelerate due to air resistance
deaccelerate due to the force of gravity
What is the height of a 160g cricket ball if it has 30J of gravitational potential energy?
18.75m
18m
10.46m
5.3m
