MechanicsDefinitions
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
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| Physical Quantity | A quantity that can be measured, or calculated, and expressed in numbers
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| Scalar Quantity | A quantity with magnitude only, not direction
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| Distance | A measure of how far one point is from another
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| Displacement | An object's overall change in position
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| Time | Used to measure the duration of an event or the interval between events
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| Speed | Rate of change of distance with respect to time
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| Vector Quantity | A quantity with both magnitude and direction
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| Velocity | Rate of change of displacement with respect to time
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| Acceleration | Rate of change of velocity with respect to time
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| Mass | A measure of the amount of matter in a body
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| Momentum | The product of mass and velocity
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| Force | That which causes acceleration
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| Acceleration due to gravity | The acceleration experienced by a body in free fall within the gravitational field of a massive body
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| Weight | A force equal to the product of mass and acceleration due to gravity
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| Centre of gravity | The point at which the whole weight of a body appears to act
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| Friction | A force that opposes the motion of a body
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| Moment of a Force | The force multiplied by the perpendicular distance to the fulcrum
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| Lever | A rigid body that is free to rotate about a fixed axis
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| Couple | A pair of equal and opposite forces whose lines of action do not coincide
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| Torque of a Couple | Product of the magnitude of one of the forces and the distance between the two forces
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| Density | Mass per unit volume
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| Pressure | Force per unit area
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| Buoyancy | Upward force on a body that is wholly or partly immersed in a fluid
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| Work | Product of force and displacement
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| Energy | Ability to do work
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| Kinetic Energy | Energy a body has due to its motion
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| Potential Energy | Energy a body has due to its position
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| Power | Rate at which work is done
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| Radian | A measure of angle found by dividing arc length by radius
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| Angular Velocity | Rate of change of angle with respect to time
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| Linear Velocity | Rate of change of displacement with respect to time in a direction perpendicular to the radius at that point
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| Periodic Time | Time taken for one complete revolution, cycle or oscillation
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| Centripetal Acceleration | Acceleration of an object travelling in uniform circular motion, directed towards the centre of the circle
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| Centripetal Force | Force required to keep up uniform circular motion, directed towards the centre of the circle
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| Elastic Constant | Constant of proportionality between force applied and the resulting displacement of spring/elastic string
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| Elasticity | Ability of a body to resist a distorting influence or stress and to return to its original shape and size when the stress is removed
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| Simple Harmonic Motion | When the acceleration of a body towards a particular point is proportional to displacement away from that point
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| Amplitude | Maximum distance an object moves away from its equilibrium position
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| Frequency | Number of revolutions, cycles or oscillations an object completes per unit time
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| Period of SHM | Time taken for one complete revolution, cycle or oscillation
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Created by:
conordesmond
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