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61 Cards in this Set

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The rate of change of velocity, measured in metres per second squared.

Acceleration of Free Fall (g)

The acceleration of a body falling under gravity. On earth this value is 9.81.

Average Speed

A measure of total distance travelled in a unit time.

Braking Distance

The distance a vehicle travels while decelerating to a stop.


A material that distorts very little even when subject to a large stress and does not exhibit any plastic deformation.

Centre of Gravity

The point at which the entire weight of an object can be considered to act,

Components of a Vector

The results from resolving a single vector into horizontal and vertical parts.

Compressive Force

Two or more forces that have the effect of reducing the volume of the object on which they are acting, or reducing the length of the spring.

Conservation of Energy

Physical law stating that energy cannot be created or destroyed, just transformed from one form to another or transferred from one place to another. This is the situation in any closed system.


Two forces that are equal and opposite to each other but not in the same straight line.

Crumple Zone

An area of a vehicle designed to increase the distance over which the vehicle decelerates and so reduces the average force acting.


Distance travelled in a particular direction.


How far one position is from another.


The resistive force that acts on a body when it moves through a fluid.


Materials that have a large plastic region, therefore can be drawn into a wire.

Elastic Deformation

The object will return to its original shape when the deforming force is removed.

Elastic Limit

The point at which elastic deformation becomes plastic deformation.

Elastic Potential Energy

The energy stored in a stretched or compressed object.


The stored ability to do work.


When there is zero resultant force acting on an object.


The change in length of an object when subjected to a tension.


A push or a pull on an object.

Force Constant

The constant of proportionality in Hooke's law.

Free Fall

When an object is accelerating under gravity.

Global Positioning System

A network of satellites used to determine an object's position on the Earth's surface.

Gravitational Force

The force due to a gravitational field acting on an objects mass.

Gravitational Potential Energy

Energy an object possesses because of its position in a gravitational field.

Hooke's Law

The extension of an elastic body is proportional to the force that causes it.

Instantaneous Speed

The speed of an object at a given moment in time.


Unit of energy, work done when a force of 1N moves its point of application 1 metre in the direction of the force.

Kinetic Energy

The work an object can do by virtue of its speed.

Moment of a Force

The turning effect due to a single force, calculated from the force multiplied by the perpendicular distance from a given point.


Unit of Fore, 1N is the force which gives a mass of 1kg an acceleration of 1ms^-2.

Plastic Deformation

The object will not return to its original shape when the deforming force is removed, it becomes permanently distorted.


Force per unit area, 1PA = 1Nm^-1.

Principle of Moments

For a body in rotational equilibrium the sum of the clockwise moments equals the sum of the anticlockwise moments.

Resultant Force

The overall velocity when two or more velocities are combined.

Resultant Velocity

The overall velocity when two or more velocities are combined.


A physical property with magnitude (size_ but not direction; i.e, Speed, Distance, Pressure etc


Distance travelled per unit time.

Spring Constant

Force per unit extension.

Stopping Distance

The sum of the thinking distance and the braking distance.


The extension per unit length.


The force per unit cross-sectional area, measured in Pascals.

Tensile Force

Two equal and opposite forces acting on a wire in order to stretch it. When both forces have the value T, the tensile force is T not 2T.

Tensile Stress

The tensile force per unit cross-sectional area.

Terminal Velocity

The velocity at which an object's drag equals its accelerating force. Therefore there is no resultant force and zero acceleration.

Thinking Distance

The distance travelled from seeing the need to stop to applying the brakes.


A type of force due to an engine.


The turning effect due to a couple.

Turning Forces

One or more forces that if unbalanced will cause rotation.

Ultimate Tensile Strength

The maximum tensile force that can be applied to an object before it breaks.

Ultimate Tensile Stress

The maximum stress that can be applied to an object before it breaks.


A force on an object due to a difference in pressure when immersed in a fluid.


A physical quantity that has both magnitude and direction; i.e, Velocity, Force, Acceleration, etc.


The displacement per unit time.

Velocity-Time Graph

A motion graph showing velocity against time for a given body.


A physical quantity representing how much 3D space an object occupies.


The gravitational force on a body.

Work Done

The product of the force and the distance moved in the direction of the force.

Young Modulus

The ratio between stress and strain.