Mechanics

Everything for the mechanics section of the edexcel spec

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Physics Paper 1 (Mechanics)
speed = distance
time
However, this formula only gives the average speed over time and does not take into account any times when a lower or higher speed. For this reason, motion is represented on a graph. They are represented as
displacement/time, velocity/times, acceleration/time where each is the integral of the next.
Displacement/time graph:
S Y axis value
U Gradient of y intercept
V Gradient of the line
A Second differential
T X axis value
Velocity/time graph
S Area under the graph
U Y intercept
V Y axis value
A Gradient
T X axis value
Acceleration time graph
S Second integral
U First integral at y intercept.
V Area under the graph
A Y axis value
T X axis value
Scalar quantities show a magnitude of a measurement only. Vector quantities show the magnitude and the direction in which they are being applied e.g. 3 ms1 north. Therefore acceleration can be a change in
direction, and not only its speed.
THE EQUATIONS OF MOTION:
a = v-u
t
1 (u + v )t
s= 2
1 at2
s = ut + 2
v2 = u2 + 2as
Vectors can be used to represent movement that is not consisting of one straight line. Two vectors can be joined tail to tip to find their resultant. The length of this is the overall magnitude.

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Newton's 3 laws of motion:
1. If a body has a number of forces F1, F2...Fn acting on it, it will remain in a state of constant motion only if F=0.
2. Acceleration is directly proportional to the objects mass and the force applied by the equation F = ma .
3. If body A exerts a force on body B, then body B exerts a force of the same size on body A, but in the opposite direction.…read more

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Efficiency = Energy input x100
Power is a measure of the rate at which energy is transferred.
energy transferred
P ower = time
Because energy can also be determined as work, which is distance x force, the distance and time cancel to form:
P ower = force x velocity
The power output of a car is often deemed its horsepower.…read more

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