Mass of the body is the quantity of matter it contains.
The units of mass is Kg .
Force is the effect on the body if the body is moving it will change its speed or stop it If the body at rest it will move.
Torque is the combination of force applied at a point with the right angle (perpendicular) distance from that point to the axis of rotation.
Friction is a force tangential to the surface has to be overcome before relative motion can take place between the bodies
Friction coefficient(m) :is a constant which depends on the nature of the pair of surfaces in contact
The weight is the gravity force for the body.
Velocity is speed plus directional information.
Speed is the rate of motion, Speed = distance / time.
Acceleration is the rate of change of velocity.
Displacement is the shortest distance between two points.
Distance is the total distance which a body travelled between two points.
The density of a substance of uniform composition is defined as its mass per unit volume.
Relative density is the ratio between density of a material and density of water.
Pressure is The force exerted by a fluid on a submerged object at any point if perpendicular to the surface of the object.
Power is the rate of doing work its unit of measurement is watt.
موضوع: definitions 
