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### 27 Cards in this Set

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 Formula for speed Speed (metres/second, m/s) = distance travelled (metres, m) ------------------------------- time taken (seconds, s) Define speed The speed of an object describes the rate at which it is travelling Define velocity The velocitu of an object is both it's speed and direction Define acceleration The rate at whioch an objects velocity is changing Formula for acceleration Acceleration (m/s²) = Change in velocity (m/s) ------------------ Time taken for change (s) When acceleration and velocity are in the same direction does the object speed up or down Speeds up When acceleration and velocity are in opposite directions does the object speed up or down The object slows down the steeper the slope of a distance time graph, the greater the ...... speed it represents. The steeper the slope of a velocity time graph the greater the ..... acceleration it represents. The area under a velocity time graph represents what. The distance travelled. Newtons third law of motion states Whenever two objects exert forces on each other, the forces are equal in size and opposite in direction When forces cancel each other out we say they are ... balanced Do balanced forces affect an object's motion No Do unbalanced forces affect an object's motion Yes; depending on the direction of the unbalanced force it may cause the object to speed up, slow down or change direction The greater the size of the unbalanced force on an object the greater it's ... acceleration The bigger the mass of an object the ...... the unbalanced force that is needed to give it a particular acceleration larger Acceleration is proportional to .... force Newtons second law of motion force = mass x acceleration One newton will accelerate a mass of one kilogram at a rate of .... one metre per second² Frictional forces ten to make a moving object .... slow down What does the braking distance of a vehicle do if its speed increases The braking distance increases What are the two parts of a stopping distance thinking breaking what is the breaking distance the distance the vehicle travels while the breaks are applied What is the reaction time Thinking distance - the time travelled by the vehicle in the time between the driver knowing the brakes should be applied and actually applying them Stopping distance = Thinking or reaction distance + braking distance Stopping distance increases if; the road is wet or icy; the driver is tried or under the influence of drink or drugs; the vehicles brakes or tyres have been pororly maintained; the vehicles spped before applying the brakes is greater Weight = mass x gravitational field strength