Laws Of Motion And Momentum Flashcards
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
