# Mechanics

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- 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

#### Back

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

#### Back

### Card 4

#### Front

No plastic region and breaks at its elastic limit

#### Back

### Card 5

#### Front

The point where the weight appears to act

#### Back

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