This is a physical property with magnitude but not direction. Another word for magnitude is size. Examples of it include speed, distance, temperature and wavelength.
Scalar
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This is a quantity that has both size and direction. Another word we can use for size is called magnitude. Examples are velocity, force, acceleration and electric current.
Vector
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This is the distance travelled in a particular direction. The unit for distance is the metre.
Displacement
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This is the speed of an object at a moment in time. A cars speedometer gives the driver an instantaneous speed.
Instantaneous Speed
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A measure of the total distance travelled in a unit time. It tells you how far an object has travelled in 1 second.
Average Speed
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The velocity of a moving object is its displacement per unit time. It is a vector quantity and is measured in metres per second (ms-1).
Velocity
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The acceleration of an object is its rate of change of velocity. It is measured in metres per second squared (ms-2). It is a vector quantity.
Acceleration
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This is the unit of force. 1 N is the force which gives a mass of 1 Kg an acceleration of 1 ms-2
Newton
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This is the turning effect due to a couple. It is measured in Newton metres (Nm).
Torque of a couple
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The moment of a force is the turning effect due to a single force. It is calculated by multiplying the force by the perpendicular distance from a given point. The units are Newton metres. (Nm)
Moment of a Force
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This is the distance travelled by a vehicle from seeing the need to stop to applying the brakes.
Thinking Distance
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The distance a vehicle travels while decelerating to a stop. This is the distance travelled after the brakes have been applied.
Braking Distance
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This is the thinking distance added to the braking distance.
Stopping Distance
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The product (multiplied together) of a Force and the distance moved in the direction of the force gives the work done by the force. It can also be thought of as the energy converted from one form into another. The unit is Joules. (J)
Work Done
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This is the unit of energy. It is the work done when a force of 1 N moves its point of application 1 m in the direction of the force.
Joule
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The rate at which work is done. It is measured in Watts (W).
Power
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This is the unit of power. Equal to one joule per second. 1 W = 1 JS-1
Watt
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This is the force per unit cross-sectional area. It is measured in Nm-2 or Pascals (Pa).
Stress
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This is the extension per unit length. It has no units. We say it is dimensionless.
Strain
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This is the ratio between stress and strain i.e. the stress divided by the strain. It has the same units as stress namely Newton metres squared ( Nm-2) or Pascal (Pa)
Young Modulus
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This is the maximum tensile (stretching) force that can be applied to an object before it breaks.
Ultimate Tensile Stress
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This means that the object will return to its original shape when the deforming force is removed.
Elastic Deformation
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This means that the object will not return to its original shape when the deforming force is removed, it becomes permanently deformed.
Plastic Deformation
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Other cards in this set
Card 2
Front
This is a quantity that has both size and direction. Another word we can use for size is called magnitude. Examples are velocity, force, acceleration and electric current.
Back
Vector
Card 3
Front
This is the distance travelled in a particular direction. The unit for distance is the metre.
Back
Card 4
Front
This is the speed of an object at a moment in time. A cars speedometer gives the driver an instantaneous speed.
Back
Card 5
Front
A measure of the total distance travelled in a unit time. It tells you how far an object has travelled in 1 second.
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