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| Question | Answer |
| P3b - Changing Speed | . |
| Speed - Time Graphs | A change in speed per unit time is called acceleration. Speed increasing = acceleration Speed decreasing = deceleration |
| Continue... | The area under a speed-time graph is equal to the distance travelled. |
| Acceleration | The 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 |
| Calculating Distance | For a triangle = half base x height For a square = base x height |
| 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 | |
| Velocity | The 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. |
| Relative Velocity | If 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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