Physics

Archimedes’ Principle

states that when an object is fully immersed in a fluid it experiences an upthrust equal in magnitude to the weight of the fluid

Boyle’s Law

states that for a fixed amount of gas at a constant temperature, the pressure and volume of the gas is indirectly proportional

Law of Floatation

states that the weight of a floating body is equal to the weight of the fluid it displaces

what does a hydrometer measure?

liquid density

Newton’s Law of Universal Gravitation

states that any two point masses in the universe attract each other with a force that is directly proportional to the product of their masses and indirectly proportional to the square of the distance between them

force couples

two forces of same magnitude apply at the same distance on opposite side of pivot point

Principle of Conservation of Momentum

states that in any interaction between 2 or more bodies, the total momentum of bodies before the collision is equal to the to the total momentum after the collision provided no external forces act on the system of bodies

mu + mu = mv + mv

Newtons 1st Law

All bodies will remain at rest, or move at a constant velocity unless acted upon by an external force

Newton’s 2nd Law

a body’s momentum change is due to the size of the external force acting upon it

Newtons 3rd Law

every action has an equal and opposite reaction

moment (M)

• scalar quantity

• unit Nm

• M = force x perpendicular distance