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OCR Gateway P3b
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- 1P3b - Changing Speed.
- 2Speed - Time GraphsA change in speed per unit time is called acceleration.
Speed increasing = acceleration
Speed decreasing = deceleration - 3Continue...The area under a speed-time graph is equal to the distance travelled.
- 4AccelerationThe formula or measuring acceleration is:
Acceleration=change in speed (or velocity) ÷ time taken
Acceleration is measured in m/s squared
A negative acceleration shows that the car is decelerating - 5Calculating DistanceFor a triangle = half base x height
For a square = base x height - 6—For the triangle: ½ base x height
½ 4 = 2
2 x height = 2 x 8
16
For the square:
(10-4)=base
base = 6
base x height = 6 x 8 = 48
48 + 16 = 64m - 7VelocityThe velocity of an object is its speed in a particular direction.
This means that two objects could be travelling at the same speed but have different velocities. For example, two cars are travelling at 30 m/s along the same road but in opposite directions:
One of the cars has a velocity of +30 m/s
The other car has a velocity of –30 m/s
The opposite signs show that they are travelling in opposite directions. - 8Relative VelocityIf two objects are moving in parallel their relative velocity can be calculated.
For example, two cars are moving in the same direction along a road. Car A is travelling at +30 m/s and Car B is travelling at +20 m/s. Their relative velocity is 30 – 20 = +10 m/s.
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- Fichas sobre OCR Gateway P3b, creado por Zaaaara el 27/05/2014.
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- Zaaaara
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