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

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

Preview of the back of card 3

Card 4

Front

No plastic region and breaks at its elastic limit

Back

Preview of the back of card 4

Card 5

Front

The point where the weight appears to act

Back

Preview of the back of card 5
View more cards

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