Law of conservation of momentum

For a system of interacting objects, the total momentum in a specified direction remains constant as long as no external forces act on the system

Elastic and inelastic collision

Momentum and energy are both conserved when two objects collide. In elastic collision the kinetic energy is retained by the objects, in inelastic collision the kinetic energy is transformed into other forms such as heat and sound

Newton’s second law

The net force acting on an object is directly proportional to the rate of change of its momentum and is in the same direction.

Impulse

The impulse of a force is the change in momentum unit Ns or Kgm/s

Momentum (equation)

Mass X velocity

Newton’s first law

And object at rest stays at rest and an object in motion stays in uniform motion unless acted upon by an unbalanced force

Inertia

The tendency of an object to resist changes in its velocity/acceleration. The more inertia in an object the more mass it has.

Newton’s third law

When two objects interact, each exerts an equal force in the opposite direction on each other with the same type of force

Everyday applications of first law

- seat belts
- headrests preventing injury
- getting ketchup out of a bottle

how do you calculate the moment of a couple and what is the moment of couple called

the moment of a couple is a torque

torque: size of one force X perpendicular distance between forces

what is the rough earths atmosphere

1 X 10^5 Pascals

what is Archimedes principle

the upthrust exerted on a body immersed in fluid, whether partially or fully submerged, is equal to the weight of the fluid displaced

what is the equation for upthrust

Axpg

Ax=volume of water displaced

p=density of liquid

g=acceleration of free fall

what is the equation for pressure in liquids

pressure = hpg

what is Archimedes principle

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