When a force acts on a spring it is stretched or compressed, its length will changes by an amount e from its original length. …

An object of constant mass accelerates in proportion to the force applied.
Demo
In this tutorial you will learn how to calculate the force applied to an object if you …

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 …

The quantity power is the rate at which work is done. The quicker work is done the greater the power.
What is Power?
The quantity power …

Stretching or squashing an object can transfer energy into its elastic potential energy store.
What is Elastic potential energy?
Stretching or squashing an object can transfer …

The size of the current is the rate of flow of charge. Electrons are negatively charged particles which transfer energy through wires as electricity.
What …

Resistance is an electrical quantity that measures how a device or material reduces the electrical current flow through it.
What is Resistance?
Resistance is an electrical …

Resistors in series and in parallel can change the total resistance in a circuit.
What is Resistance in series and parallel?
Resistors in series and in …

The power of an appliance is the energy that is transferred per second. Electric power is the rate, per unit time at which electrical …

Lifting an object in a gravitational field transfers energy into the objects gravitational energy store. Gravitational potential energy is the energy an object has due to its …

The efficiency of a device is the proportion of input energy that is converted to useful energy.
What is Efficiency?
The efficiency of a device is …

The potential difference between two points is the energy transferred per unit charge. An electrical circuit is an energy transformation device.
What is Energy transformed?
The …

The unit for work done is the joule (J), or Newton meter (N-m). One joule is equal to the amount of work that is done when 1 N of force moves an …

All moving objects have momentum. Forces can cause changes in momentum. The total momentum in a collision or explosion is conserved and stays the …

Uniform or constant acceleration is a type of motion in which the velocity of an object changes by an equal amount in every equal time period.
Demo
In …

Acceleration is how quickly the velocity is changing whether it be speed, direction or both. Acceleration is a measure of how quickly the velocity …

Speed is how fast an object is moving in no given direction. Velocity is how fast an object is moving in a given direction. …

Weight is the force acting on an object due to gravity. The weight of an object is defined as the force of gravity on the object …

Weight is the force acting on an object due to gravity. The weight of an object can be defined as the force of gravity on the …