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Forces and motion 2


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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 ...
Do balanced forces affect an object's motion
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 ...
The bigger the mass of an object the ...... the unbalanced force that is needed to give it a particular acceleration
Acceleration is proportional to ....
Newtons second law of motion


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
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

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