G481 Key Definitions

This is a set of flashcards for the key definitions from unit G481: Mechanics from OCR A physics 

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  • Created by: abbiemca
  • Created on: 20-04-16 23:59
Speed
Rate of change of distance (m/s)
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Average Speed
Total distance travelled/time taken (m/s)
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Displacement
Distance moved in a stated direction (m)
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Velocity
Rate of change of displacement (m/s)
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Scalar Quantity
A quantity with magnitude (size) but not direction
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Vector Quantity
A quantity with magnitude (size) and direction
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Acceleration
Rate of change of velocity (m/s^2)
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Thinking Distance
Distance traveled from when the driver sees a problem and the brakes are applied
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Braking Distance
Distance travelled from when the driver starts braking to when the car stops
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Stopping Distance
Distance travelled from when the driver sees a problem to when the car stops (thinking distance + braking distance)
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Density
Mass per unit volume (kg/m^3)
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Newton
One Newton is the force that causes a mass of one kilogram to have an acceleration of one metre per second squared (N)
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Weight
The weight of an object is the gravitational force acting on the object (N)
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Centre of Gravity
A point where the entire weight of an object appears to acct
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Drag
The resistive force experienced by an object moving through a fluid
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Terminal Velocity
At terminal velocity drag = weight
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Equilibrium
At equilibrium net resultant force = 0 and net moment = 0
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Moment of a Force
The force multiplied by the perpendicular distance from a specified point (Nm)
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Principle of Moments
If an object is balanced, then the sum of the clockwise moments about a pivot is equal to the sum of the anticlockwise moments about the same pivot
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Couple
A couple is a pair of equal and opposite forces, which tends to produce rotation only
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Torque of a Couple
The force multiplied by the perpendicular distance between the forces (Nm)
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Pressure
Force per unit area (Pa)
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Work Done
The force multiplied by distance moved in the direction of the force (J)
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Joule
The work done by a force of one newton acting over a distance of one metre
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Potential Energy
The stored energy associated with a force due to the position of a body (J)
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Gravitational Potential Energy
The stored energy associated with the weight of a body at a given vertical height (J)
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Kinetic Energy
The energy of a body due to the motion of the body (J)
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Conservation fo Energy
Energy cannot be created or destroyed, it can only be transformed into other forms
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Power
Rate of work done with respect to time (W)
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Hooke's Law
Extension of material is proportional to force applied to material
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Watt
One joule per second
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Tensile Stress
The force per unit cross-sectional area of a material
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Tensile Strain
The extension per unit length of a material
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Young's Modulus
Tensile stress per unit tensile strain
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Ultimate Tensile Stress
The maximum stress a material can stand
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Elastic Deformation
Material regains its original shape when stress is removed
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Plastic Deformation
Material is permanently distorted when dress is removed
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Other cards in this set

Card 2

Front

Total distance travelled/time taken (m/s)

Back

Average Speed

Card 3

Front

Distance moved in a stated direction (m)

Back

Preview of the back of card 3

Card 4

Front

Rate of change of displacement (m/s)

Back

Preview of the back of card 4

Card 5

Front

A quantity with magnitude (size) but not direction

Back

Preview of the back of card 5
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