# Momentum

Momentum booklet revision

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• Momentum
• Thinking time- time taken to react by a driver
• Thinking distance- distance the car between a hazard appearing and the driver applying the brakes.
• Braking Time- the time taken for the car to stop after the driver has reacted to the hazard.
• Braking distance- diistance the car travels before it comes to a halt whilst the brakes are being applied.
• Speed and velocity
• Average Speed= Total distance travelled/ Time taken
• Average Speed= 100km/1.25h = 80km/h
• Acceleration= (final velocity-initial velocity)/ time taken
• E.G. v=12m/s u=18m/s t=3s = 12-18/ 3 = -6/3 = -2m/s2
• Motion
• FINAL VELOCITY= INTITAL VELOCITY + ACCELERATION TIME.
• DISPLACEMENT= (INTIAL VELOCITY + FINAL VELOCITY) TIME/2
• DISPLACEMENT= INITAIL VELOCITY TIME +ACCELERATION TIME2/2
• FINAL VELOCITY2= INITIAL VELOCITY2 +2ACCELERATION DISPLACEMENT
• Newton's Laws of Motion
• 1. A body stays at rest or continues at constant speen unless acted upod by an unbalanced force
• 2. Force (N)= mass(kg) x acceleration (m/s2)
• Momentum(kgm/s) = mass(kg) x velocity (m/s)
• Freefall= 1kg= 10N on Earth
• Acceleration on Freefall= 10m/s2
• Gravitational field strength =10N/kg
• Braking distance- diistance the car travels before it comes to a halt whilst the brakes are being applied.
• Displacement- distance from starting point
• Momentum
• Thinking time- time taken to react by a driver
• Thinking distance- distance the car between a hazard appearing and the driver applying the brakes.
• Braking Time- the time taken for the car to stop after the driver has reacted to the hazard.
• Speed and velocity
• Average Speed= Total distance travelled/ Time taken
• Average Speed= 100km/1.25h = 80km/h
• Acceleration= (final velocity-initial velocity)/ time taken
• E.G. v=12m/s u=18m/s t=3s = 12-18/ 3 = -6/3 = -2m/s2
• Motion
• FINAL VELOCITY= INTITAL VELOCITY + ACCELERATION TIME.
• DISPLACEMENT= (INTIAL VELOCITY + FINAL VELOCITY) TIME/2
• DISPLACEMENT= INITAIL VELOCITY TIME +ACCELERATION TIME2/2
• FINAL VELOCITY2= INITIAL VELOCITY2 +2ACCELERATION DISPLACEMENT
• Newton's Laws of Motion
• 1. A body stays at rest or continues at constant speen unless acted upod by an unbalanced force
• 2. Force (N)= mass(kg) x acceleration (m/s2)
• Momentum(kgm/s) = mass(kg) x velocity (m/s)
• Freefall= 1kg= 10N on Earth
• Acceleration on Freefall= 10m/s2
• Gravitational field strength =10N/kg
• Distance is a scalar quantity- it has size only   Displacement is a vector quantity- it has size and direction.