Forces can cause an object to rotate and the turning effect of the force is called a moment. If a resultant force acts on an object about a fixed turning point called the pivot or fulcrum it will cause the object to rotate e.g. using a spanner, a screwdriver, opening a door hanging on hinges.
When a force acts on a spring it is stretched or compressed, its length will changes by an amount e from its original length.
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Pressure can be calculated if you know the force applied to or by an object and the contact area. The units are newtons per square meter, or N/m2.
An object of constant mass accelerates in proportion to the force applied.
In physics, the kinetic energy (KE) of an object is the energy that it has due to its motion. It is defined as the work needed for an object of a known mass to accelerate to a given velocity.
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The quantity power is the rate at which work is done. The quicker work is done the greater the power.
Stretching or squashing an object can transfer energy into its elastic potential energy store.
The size of the current is the rate of flow of charge. Electrons are negatively charged particles which transfer energy through wires as electricity.
Resistance is an electrical quantity that measures how a device or material reduces the electrical current flow through it.
The power of an appliance is the energy that is transferred per second. Electric power is the rate, per unit time at which electrical energy is transferred by an electric circuit.
