Definition

Accuracy

The nearest of a measurement to the standard or true value.

Precision

Several measurement very close to each other.

Scalar

A scalar quantities is one that can be describe with a single number (including any units) giving its size or magnitude.

Are quantities that are fully describe by a magnitude (or numerical value) alone.

Vector

A quantity that deals inherently with both magnitude and direction.

Are quantities that are fully described by both a magnitude and a direction.

Homogeneous

Each term in an equation has the same base units

Distance

Total length covered irresponsible to the direction of motion

Displacement

Distance move in certain direction

Speed

Distance travel per unit time [ms-1].

Velocity

Rate of change of displacement, or displacement per unit time [ms -1].

Acceleration

Rate of change of velocity [ms-2].

Mass

Measurement of how much matter is in an object.

Weight

Measurement of how hard gravity is pulling on the object.

Inertia

Natural tendency of an object to remain at rest or in motion of a constant speed along a straight line. Mass is the quantitative measure of inertia.

Force

1 Newton is defined as the force needed to accelerate a mass of 1 kg by 1 m s-2.

Centre of gravity

Centre of gravity of an object is defined as the point where its entire weight appears to acts.

The centre of gravity of an object is defined as the point where all the weight of the object may be considered to act.

Tor que

The moment of a force = force x perpendicular distance of the pivot from the line of action of the force.

Torque of a couple

Torque of a couple = one of the force x perpendicular distance between the force.

Work done

The work done by a force is defined as the product of the force and the distance moved in the direction of the force.

Joule

Joule is defined as the amount of work done when a force of 1 newton (N) move a distance of 1 metre (m) in the direction of the force.