Laws Of Motion And Momentum Flashcards Preview

Physics ALevel OCR > Laws Of Motion And Momentum > Flashcards

Flashcards in Laws Of Motion And Momentum Deck (15)
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1
Q

Law of conservation of momentum

A

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

2
Q

Elastic and inelastic collision

A

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

3
Q

Newton’s second law

A

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

4
Q

Impulse

A

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

5
Q

Momentum (equation)

A

Mass X velocity

6
Q

Newton’s first law

A

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

7
Q

Inertia

A

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

8
Q

Newton’s third law

A

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

9
Q

Everyday applications of first law

A
  • seat belts
  • headrests preventing injury
  • getting ketchup out of a bottle
10
Q

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

A

the moment of a couple is a torque

torque: size of one force X perpendicular distance between forces

11
Q

what is the rough earths atmosphere

A

1 X 10^5 Pascals

12
Q

what is Archimedes principle

A

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

13
Q

what is the equation for upthrust

A

Axpg
Ax=volume of water displaced
p=density of liquid
g=acceleration of free fall

14
Q

what is the equation for pressure in liquids

A

pressure = hpg

15
Q

what is Archimedes principle

A

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