Physics
Scalar
A scalar is a quantity that has magnitude only.
Vector
A vector is a quantity that has magnitude and direction.
The moment (or torque) of a force.
The turning effect of a force (or moment or torque) about a point is defined as the force x the perpendicular distance from the point to the line of action of the force,
i.e. moment = F × d.
UNIT: Nm.
The principle of moments.
For a system to be in equilibrium,
Σ anticlockwise moments about a point = Σ clockwise moments about the same point.
Centre of gravity.
The centre of gravity is the single point within a body at which the entire weight of the body is considered to act.
Displacement
The displacement of a point B from a point A is the shortest distance from A to B, together with the direction.
UNIT: m.
Scalar
A scalar is a quantity that has magnitude only.
Vector
A vector is a quantity that has magnitude and direction.
The moment (or torque) of a force.
The turning effect of a force (or moment or torque) about a point is defined as the force x the perpendicular distance from the point to the line of action of the force,
i.e. moment = F × d.
UNIT: Nm.
The principle of moments.
For a system to be in equilibrium,
Σ anticlockwise moments about a point = Σ clockwise moments about the same point.
Centre of gravity.
The centre of gravity is the single point within a body at which the entire weight of the body is considered to act.
Displacement
The displacement of a point B from a point A is the shortest distance from A to B, together with the direction.
UNIT: m.
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