Compare acceleration from gradients quantitatively using velocity/time graphs.
If the line is positive then it is accelerating and if the line is negative then it is decelerating.
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How do you work out distance travelled in a velocity/time graph?
Velocity x time taken (the area under the line)
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How can you measure the speed of objects using light gates?
Measure the distance that the object will be travelling then roll the object through the light gate, which should be connected to a laptop. This will measure the exact time taken. Divide the distance by the time and that will be the speed.
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What is Newton's first law?
Newton's first law is that a moving object will continue to move at the same speed and direction unless an external force acts on it. A stationary force will stay stationary unless an external force acts on it.
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What is Newton's second law?
The acceleration in the direction of a resultant force depends on the size of the force (the bigger the force, the bigger the acceleration) and the mass of the object (The bigger the object, the smaller the acceleration).
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How is force worked out?
force= mass x acceleration
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How is weight worked out?
Weight= mass x gravitational field strength
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What is the gravitational field strength on Earth and the moon?
Earth= 10N/kg Moon= 1.6N/kg
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How is weight different from mass?
Mass is the quantity of matter there is in an object and can only change if something is added to or removed from the object. Weight is a measure of the pull of gravity on an object and depends on the strength of gravity.
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What is Newton's third law?
When objects touch or are at a distance and have a gravitational attraction then there is a pair of forces acting on the 2 objects (action-reaction forces). The 2 forces are always the same size and in opposite directions. The forces are the same.
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How does Newton's third law apply to equilibrium?
If the exact same amount of force is being exerted on each object then nothing will move. For example if two people are tugging on a rope with the same amount of force then none of them will move.
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Explain how to measure human reaction times and state typical results.
Human reaction times can be measured by the ruler test. This is by dropping a ruler & seeing how fast the other person catches it. Typical results vary depending on the stimulus. Visual= 0.25, Sound= 0.17, Touch= 0.15 (Seconds)
The mass of the vehicle, the speed of the vehicle, the driver's reaction time, the state of the vehcle's brakes, the state of the road and the amount of friction between the tyres and the road surface.
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What factors could affect a driver's reaction time?
If the driver has taken drugs, is tired or has distractions such as a mobile phone. Also, drinking coffee could decrease your reaction time.
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Explain the dangers caused by large deceleration's.
A deceleration injury could happen which occurs when a fast moving vehicle slows down or stops abruptly. It can cause high level damage to the brain.
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Other cards in this set
Card 2
Front
How do you work out distance travelled in a velocity/time graph?
Back
Velocity x time taken (the area under the line)
Card 3
Front
How can you measure the speed of objects using light gates?
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