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physics revision (equations (force=mass*acceleration (this law explains…
physics revision
equations
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force=mass*acceleration
this law explains relationship between an object's mass and the amount of force needed to accelerate it
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distance time graphs
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A straight slope on the graph indicates a steady speed and a horizontal line indicates the object is stationary
The gradient of the line is equal to the speed of an object the greater the gradient the greater the speed of the object
velocity time graphs
horizontal line = constant velocity, horizontal line at zero=object is at rest, constant acceleration = a straight line that is sloped
curved lines = a change in velocity that is not constant
The steeper the line the greater the acceleration and a line sloping downwards shows constant deceleration
The velocity of an object is its speed but in a certain direction so if two cars were going in opposite directions at the same speed there velocities would be opposite
vectors and scalars
Speed is a scalar because no direction is stated with it. But velocity is a vector as it has magnitude and a direction
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force has to be a vector as to fully understand a force you need to understand not only the magnitude of the force (N) but also the the direction of the force therefore it must be a vector
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You can work out the distance travelled from a velocity time graph by working out the area under the velocity time graph
forces can change an objects speed, direction or shape
If the forces on an object are balanced the object will either remain stationary or the object will remain at a constant speed
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