Resultant for make an object speed up or slow down.
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What is mass?
Amount of matter, in kg.
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What is weight?
Force caused by grativty, in Newtons (N).
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What is gravity?
Acceleration.
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What is air resistance?
Force caused by 'collisions' with air particles, slows down objects. Bigger surface area = more air resistance. Faster speed = more air resistance.
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What is terminal velocity?
Maxium, steady speed. Air resistance and weight balance.
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What is meant by thinking distance?
Distance travelled between seeing the hazards and applying the brakes.
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What are factors that increase thinking distance?
Alcohol, drugs, tiredness, distractions (eg mobile phones), FASTER speed.
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What is braking distance?
Distance travelled whilst braking.
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What are factors that can increase braking distance?
Bad brakes, worn tyres, ice, snow, FASTER speed.
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How to calculate stopping distance?
Thinking distance + braking distance
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What is the rule of speed and braking distance?
Double speed = 4 x braking distance
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What is passive safety?
Prevent crashes e.g electric windows, paddle controls.
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What is active safety and how does it work?
Reduce injuries in a crash e.g crumple zones, seat belts, air bags. All- increase the collision time, decrease the acceleration, decrease the force. Energy dissipated slowly.
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What is momentum and how to calculate it?
Moving objects want to stay moving. Mass x velocity
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2 different of fuels?
Petrol, diesal.
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What are alternative fuels?
Electric cars, biomass, hybrids.
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What does power mean?
How fast you 'use up' your energy.
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How does driving style affect affect fuel consumption?
Aggressive acceleration/braking,carrying too much and traffic jams.
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What does work done mean?
Equal to energy transferred
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What does kinetic energy mean?
Energy of moving objects
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What is gravitational potential energy?
Energy objects have because they are above the ground.
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What happens to falling objects?
Gravitational potential energy decreases. Kinetic energy increases
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