Mechanics-Linear Definitions I Flashcards
(28 cards)
Displacement is: {Definition}
Displacement is distance from a point in a given direction. [m]
Velocity is: {Formula}
Velocity is:
displacement/time [m/s].
V = s/t [V=final velocity, s=displacement, t=time]
Acceleration is: {Formula}
Acceleration is:
change in velocity/time [m/s2]
a = (v – u)/t [a=acceleration, v=final velocity, u=initial velocity, t=time]
A vector is: {Definition}
A vector is a quantity with magnitude and direction. E.g., force, acceleration.
A scalar is: {Definition}
A scalar is a quantity with magnitude only. E.g., distance, time, mass.
Newton’s 1st law of motion: {Definition}
A body will travel with a constant velocity unless an external force acts on it. E.g., friction, gravity.
Newton’s 2nd law of motion: {Definition}
The rate of change of movement of the body is proportional to the force applied and takes place in the direction of the force.
Newton’s 3rd law of motion: {Definition}
When a body A exerts force on a body B, then body B exerts an equal but opposite force a body A.
Force is: {Definition} & {Formula}
Force is that which causes acceleration. [F=ma]
A Newton is: {Definition}
A Newton is: the force that causes a mass of 1kg to gain an acceleration of 1 ms-2.
Friction is: {Definition}
Friction is a force that opposes motion when two objects slide over each other.
Momentum is: {Formula}
Momentum is: p =mv [p: momentum, m: mass, v: velocity] kg m/s
Principle of conservation of momentum is: {Definition}
Principle of conservation of momentum is: the total momentum before an interaction equals dumb after an interaction if there are no external forces acting.
Density is: {Formula}
Density is: p = m/v [p: density, m: mass, v: volume] kg/m3
Pressure is: {Formula}
Pressure is: P = F/A [P: pressure, F: force, A:area] Pa
A Pascal is: {Definition}
A Pascal is: the pressure when a force of 1N is exerted on an area of 1 m2.
Boyles Law is: {Definition}
Boyles Law is: At constant temperature for a fixed mass of gas pressure is inversely proportional to volume.
Archimedes principle is: {Definition}
Archimedes principle is: when a body is partially or wholly immersed in a fluid, it experiences an apparent loss in weight (upthrust) equal in magnitude to the weight of the fluid displaced.
Law of floatation is: {Definition}
Law of floatation is: the weight of floating body = weight of fluid displaced.
Work is: {Formula}
Work is: W = Fs [W:Work, F:Force, s:displacement]
A Joule is: {Definition}
A Joule is: the work done when a force of 1N is exerted for a distance of 1m.
Energy is: {Definition}
Energy is: the ability to do work. [J]
Kinetic energy is: {Formula}
Kinetic energy is: Ek = 1/2 mv2 [E: energy, m: mass, v: velocity] [J]
Potential energy is: {Formula}
Potential energy is: Ep = mgh [E: energy, m: mass, g:acceleration due to gravity, h: height] [J]
