Physics P3 Forces and Motion
Created by AP.
- Created by: A.P
- Created on: 19-01-13 17:11
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- Forces and Motion
- Forces, Mass and Acceleration
- If the forces acting on an object are balanced, it's at rest or has a constant speed. If the forces acting on an object are unbalanced, it speeds up or slows down.
- The unit of force in the newton (N).
- force = mass x acceleration
- Where F = unbalanced force in N, m = mass in kg and a = acceleration in m/s2
- The equation f=ma is used to find mass or acceleration if the resultant force is known.
- Car Safety
- Reaction time, and therefore thinking distance, may increase if a driver is...
- ...tired, under the influence of alcohol or other drugs, travelling faster or distracted (lacking concentration).
- Braking distance may increase if...
- ...thre road conditions are poor, e.g. icy, the car has not been properly maintained, e.g. worn brakes, or the speed is increased.
- For safe driving, it is important to be able to stop safely.
- Keep an appropriate distance from the car in front.
- Have different speed limits fro different types of road and locations.
- Slow down when road conditions are poor.
- Have different speed limits fro different types of road and locations.
- Keep an appropriate distance from the car in front.
- Factors affecting breaking distance are:
- The greater the mass of a vehicle the greater its braking distance.
- The greater the speed of a vehicle the greater its braking distance.
- When the brakes are applied the brake pads are pushed against the disc. This creates a large friction force that slows the car down. Worn brakes reduce the friction force, increasing the braking distance.
- Worn tyres with very little tread reduce the grip of the wheels on a slippery road, leading to skidding and an increase in distance.
- Increased braking force reduces the stopping distances.
- Worn tyres with very little tread reduce the grip of the wheels on a slippery road, leading to skidding and an increase in distance.
- When the brakes are applied the brake pads are pushed against the disc. This creates a large friction force that slows the car down. Worn brakes reduce the friction force, increasing the braking distance.
- The greater the speed of a vehicle the greater its braking distance.
- The greater the mass of a vehicle the greater its braking distance.
- Thinking distance increases linearly with speed.
- Braking distance increases as a squared relationship, e.g. the braking distance at 60mph is nine times the braking distance at 20mph.
- Untitled
- Reaction time, and therefore thinking distance, may increase if a driver is...
- Forces, Mass and Acceleration
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