What is a **MOMENT?**

A moment is the turning effect of a force.

What is a **PIVOT?**

A pivot is the point that does not move by rotation.

Finish:

When an object is in ___ , the sum of the _____ is ____ to the sum of the _________

When an object is in balance, the sum of the clockwise moments is equal to the sum of the anticlockwise moments.

What is the equation for a **MOMENT?**

Moment = Force × Distance (Perpendicular distance from the pivot)

What is **MASS?**

Mass is the amount of matter in an object.

Mass is constant.

What is **WEIGHT?**

Weight is the downward force on an object due to gravity.

Weight vaires with acceleration due to gravity (g).

What is meant by **THE CENTRE OF MASS?**

The point through which any externally applied force produces straight-line motion but no rotation.

What is meant by **THE** **CENTRE OF GRAVITY?**

The point through which an object’s weight appears to act.

What is the equation for PRESSURE and what is its **UNIT**?

Presser = Force ÷ Area

P = F ÷ A

Pressure is measured in Nm² or Pa

What is the equation for **DENSITY?**

Density = Mass ÷ Volume

ρ = m ÷ V

ρ = kgms-³ (kgms to the -3)

What is **UPTHRUST?**

The upthrust is the difference between the upper surface force and the lower surface force

What is the equation for **UPTHRUST?**

(h+x)ρAg - ρhAg =xρAg

State **ARCHIMEDE'S PRINCIPLE**

The upthrust exerted on a body immersed in a fluid, whether fully or partially submerged, is equal to the weight of the fluid that the object displaces.