Leaving Cert Physics mechanics definitions

Pregunta	Respuesta
physical quantity	A physical quantity is one that can be measured or calculated and expressed in numbers
scaler quantity	A scaler quantity is one with magnitude only. It has no directional component
distance	The distance between two points is a measure of how far one point is from the other
time	Time is used to measure the duration of events to put them in sequence or to measure the interval between them
speed	Speed is the distance travelled per unit time
vector quantity	A vector quantity is one with both magnitude an direction
displacement	Displacement is distance in a given direction
velocity	Velocity is the rate of change of displacement with respect to time
acceleration	Acceleration is the rate of change of velocity with respect to time
mass	Mass is a measure of the amount of matter in a body
momentum	Momentum is the product of mass and velocity
force	A force is that which can cause acceleration
acceleration due to gravity	Acceleration due to gravity is the acceleration experienced by a body in free fall within the gravitational field of a massive body
weight	Weight is a force equal to the product if mass and acceleration due to gravity
Centre of gravity	Centre of gravity is the point at which the whole weight of the bidy appears to act
friction	Friction is a force that opposes the motion of a body
moment of a force	The moment of a force is the force multiplied by the perpendicular distance to the fulcrum
lever	A lever is a rigid body that is free to rotate about a fixed axis
couple	A couple is a pair of equal and opposite forces whose line of action fo not coincide
torque	The torque of a couple is equal to the magnitude if one of the forces multiplied by the distance between them
density	Density is mass per unit volume
pressure	Pressure is force per unit area
buoyancy	Buoyancy is the upward force on a body that is wholly or partially immersed in a fluid
work	Work is the product of force and displacement
energy	Energy is the ability to do work
kinetic energy	Kinetic energy is the energy a body has due to its motion
potential energy	Potential energy is the energy a body has due to its position or condition
power	Power is the rate at which work is done
angle	Angle measured in radians is equal to the arc length divided by the radius
angular velocity	Angular velocity is the rate of change of angle
linear velocity	Linear velocity is the speed of the particle in a direction perpendicular to the radius at that point
periodic time	Periodic time is the time taken for one complete revolution cycle or oscillation
centripetal accleration	Centripetal acceleration is the acceleration of an object travelling in uniform circular motion it is directed towards the centre of the circle
centripetal force	Centripetal force is the force required to maintain uniform circular motion it is directed towards the centre of the circle
the elastic constant	The elastic constant is the constant of proportionality between the applied force and the resulting displacement of a given spring
elasticity	Elasticity is the ability of a body to resist a distorting influence or stress and to return to its original size and shape when the stress is removed
simple harmonic motion	Simple harmonic motion is where the acceleration of a body towards a particular point is proportional to displacement from that point
amplitude	Amplitude is the maximum distance that an object moves from its equilibrium position
frequency	Frequency is the number of cycles or oscillations the object completes per unit time
period	The period of a particle executing shm is the time taken for one complete oscillation

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Leaving Cert Physics mechanics definitions

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