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16 Cards in this Set
- Front
- Back
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Physics |
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What is a resultant force? |
A single force that has the same effect as all the forces acting on an object |
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What happens when the resultant force is at: Zero? Not Zero? |
Zero: At rest or constant velocity not Zero: Velocity of an object will change |
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How to calculate the speed of an object, from a distance - time graph? |
Gradient = height of the triangle -------------------------------- Base of triangle |
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What does the gradient mean on a distance-time graph?
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Speed |
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What is Velocity? |
Is speed in a given direction |
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How to calculate acceleration from a velocity-time graph? |
Acceleration = Change of velocity --------------------------- Time taken |
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What does the gradient mean on a velocity-time graph? |
Acceleration |
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Energy transfers that occur on braking |
Friction and heat |
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What is: a) Stopping distance b) Thinking distance c) Braking distance |
a) The shortest distance a vehicle can safely stop in b) The distance travelled by the vehicle in the time it takes for the driver to react c) The distance travelled by the vehicle during the time the braking force acts |
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Factors that affect stopping distance |
1. Tiredness, alcohol and drugs 2. The faster the vehicle is traveling 3. Adverse road conditions 4. Poorly maintained vehicles |
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Terminal velocity |
When an object reaches a point where it no longer has a resultant force, the weight becomes equal to the air resistance |
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What does work done mean |
Energy transfer |
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Law of conservation? |
The total momentum before and event is equal to the total momentum after an event |
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Benefits of: a) Air bags b) Crumple zones c) Seat belts d) Side impact bars |
a) increase impact time + Spread forces b) increase impact time c) increase impact time+ Spread forces d) increase impact time |
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How does static electricity build up on insulating materials? |
Substance becomes negatively charged, |
