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61 Cards in this Set
 Front
 Back
Acceleration 
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. 

Brittle 
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. 

Couple 
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. 

Displacement 
Distance travelled in a particular direction. 

Distance 
How far one position is from another. 

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

Ductile 
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. 

Energy 
The stored ability to do work. 

Eqilibrium 
When there is zero resultant force acting on an object. 

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

Force 
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. 

Joule 
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. 

Newton 
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. 

Pressure 
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. 

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

Speed 
Distance travelled per unit time. 

Spring Constant 
Force per unit extension.


Stopping Distance 
The sum of the thinking distance and the braking distance. 

Strain 
The extension per unit length. 

Stress 
The force per unit crosssectional 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 crosssectional 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. 

Thurst 
A type of force due to an engine. 

Torque 
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. 

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

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

Velocity 
The displacement per unit time. 

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

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

Weight 
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. 