physic

• Work done = force x distance moved
• The SI unit of energy is the joule (J).
• Displacement is the distance moved in a particular direction
• Distance travelled below is not equal to displacement
• Speed is distance moved by object per unit time
• Velocity is the distance travelled per unit time in a specified direction
• velocity = displacement / time taken
• Acceleration is the rate of change of velocity
• Acceleration = change in velocity / time taken
• If velocity of a moving object is decreasing, it is decelerating or retarding
• Solid: molecules arranged in close together in regular patterns, incompressible because molecules are close together with have little space between them.
• Solid: balanced between molecule holds them in fixed positions, molecules vibrate about fixed positions, alternately attracting and repelling one another, strong attractive forces prevent molecules from leaving fixed positions while repulsive forces between atoms to prevent them from collapsing into one another.
• Work = force x distance
• Power = work done / time
• mass = density x volume
• weight = mass x gravitational force
• moment = force x distance
• Ek = 1/2mv^2
• velocity = displacement / time
• Moment of a force is the product of the force and perpendicular distance from the pivot to the line of action of

  the force.