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14 Cards in this Set
- Front
- Back
- 3rd side (hint)
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Newton's first law of motion. |
An object moving at constant velocity is either acted on by no forces, or the forces acting on it are balanced. |
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In terms of lifts, The tension in the cable is less than the weight of... |
- the lift is moving up and decelerating - the lift is moving down and accelerating |
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In terms of lifts, The tension in the cable is greater than the weight of... |
- the lift is moving up and accelerating - the lift is moving down and decelerating |
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Terminal velocity |
Drag force is equal and opposite to its weight. (Acceleration is then zero, and speed remains constant) |
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Drag force depends on? |
- the shape of object - it's speed - the viscosity of the fluid |
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Thinking distance (Words) |
Distance travelled by a vehicle in the time it takes the driver to react. |
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Thinking distance (Equation) |
S1 = speed x reaction time = v x t0 |
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Braking distance (Words) |
Distance travelled by a car in the time it takes to stop safely, from when the brakes are first applied. |
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Braking distance (Equation) |
S2 = (u*2) / 2a
Assuming constant deceleration (*) means to the power of |
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Stopping distance |
Thinking distance + stopping distance
ut0 + (u*2) / 2a
U is speed before brakes applied |
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Impact time (Equation) |
t = 2s / (u + v) |
Newtons second law |
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Acceleration (Equation) |
a = (v - u) / t |
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Impact force (Equation) |
F = ma |
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5 car safety features |
1- vehicle bumpers 2- crumple zones 3- seat belts 4- collapsible steering wheel 5- airbags |
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