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Topic 1: Forces
A force can change the shape of an object, its motion, or its state of rest.
The driving force of a car is the force that makes it move. Friction acts when the tyre is in contact with
the ground. When the car moves forward:
The force of friction on the ground on the tyre is in a forward direction. The force of the tyre onto the
ground is backwards in other words the tyre pushes the ground backwards and the ground pushes
the tyre forwards. Not to get into the specifics of relativity, but "the car moves forward" in this case.
When two forces interact they always exert equal and
opposite forces. A reaction force is a force reacting to
another eg firing a cannon the cannon rolls back
The resultant force is a single force that is equal to the
effect of all forces acting on an object. If the resultant
force on an object is zero then the object stays at rest or
constant. If two forces are acting on the same object the
resultant forces are their total or difference.
Topic 2: Acceleration
Acceleration = speed/time = 1/t2 units: m/s/s
Velocity Time graphs:
The AREA under the graph is DISPLACEMENT
The GRADIENT is ACCELERATION
Displacement Time graphs:
The GRADIENT is the VELOCITY due to this equation:
Topic 3: Accelerating Forces
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The accelerating force is mass x acceleration, often shortened to force = ma
Remember 1N = 1kgm /s2 because it is mass (kg) time acceleration (m/s/s).
F = resultant force as well as accelerating force.
Using the resultant force from a diagram you can calculate the acceleration.
Remember weight is a force too (the Rocket Problem). Weight is measured
in Newtons as it is vector, but mass is scalar and measured in kg.
Topic 4: Terminal Velocity (using Fig. C)