# Mechanics

• Created by: Shanmelv
• Created on: 20-09-18 13:02
Acceleration
Rate of change of velocity
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Braking distance
The distance travelled by the car whilst the brakes are applied and the car comes to a stop
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Braking Force
The frictional force applied by the road on the tyre, in the opposite direction to the motion of the vehicle, that brings the vehicle to rest
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Brittle
No plastic region and breaks at its elastic limit
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Centre of gravity
The point where the weight appears to act
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condition for mechanical equilibrium
resultant force = 0 and total moment = 0
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Couple
A pair of equal and opposite forces
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Density
Density = mass/volume
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Displacement
A vectore directed from initial position to final position having magnitude equal to the distance between those points
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Ductile
A ductile material has a large plastic region
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Elastic Limit
If an object is a subject to a stress/force that produces a extention which exceeds the elastic limit of the sample then a permanent deformation will remain when the stress/force is removed
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Extension
Length of spring/wire - orginal length
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Hookes law
The extension is directly proportional to the force applied,provided the elastic limit is not exceeded
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Line of action of a force
A straight line sharing parallel to the force considered and passing through the pointof application of the force
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Moment of a force
moment = force x perpendicular distance from pivot
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newton
A force of 1 newton will produce a acceleration of 1ms-2 when acting on a mass of one kilogram
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Plastic deformation
the material is permanently deformed
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Power
work done dived by the time taken
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Pressure
Pressure = force x area
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Principle of the conservation of energy
Energy cannot be created or destroyed, it can only be transferred into other forms
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Principle of moments
For equilibrium of an object, the sum of the clockwise moments about a point must be equal to the sum of the anticlockwise moments about the same point
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Resultant Force
The vector sum of of all the individual forces acting on a body
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Stiff
A stiff material has a large Young modulus
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Stress
stress = force / cross-sectional area
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Strain
Strain = extension / original length
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Stopping distance of a car
thinking distance + braking distance
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Torque of a couple
Torque of a couple = one of the forces x perpendicular distance
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Thinking Distance
The distance travelled from when the driver sees a problem and the brakes are applied
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Vector quanity
A quantity that has both magnitude and direction
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Velocity
Velocity = rate of change of displacement
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Watt
Watt is the power used when one joule of work is done per second
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Young Modulus
Young modulus = stress/strain
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## Other cards in this set

### Card 2

#### Front

The distance travelled by the car whilst the brakes are applied and the car comes to a stop

Braking distance

### Card 3

#### Front

The frictional force applied by the road on the tyre, in the opposite direction to the motion of the vehicle, that brings the vehicle to rest

### Card 4

#### Front

No plastic region and breaks at its elastic limit

### Card 5

#### Front

The point where the weight appears to act