3.5 - Newton's laws of motion and momentum

If an object is in equilibrium it means the object is....

Not accelerating. Either stationary or constant velocity

Which of Newton's Laws state 'every action force has an equal and opposite reaction force'?

Newton's third law

What is Newton's second law?

F=ma

The resultant force of object is proportional to the rate of change of momentum of the object and in the same direction

What is Newton's first law?

An object at rest or moving with constant velocity will stay that way unless a resultant force acts upon it.

What is the difference between elastic and inelastic collisions?

Elastic: Kinetic energy before is equal to kinetic energy after (no energy lost)

Inelastic: Kinetic energy at the end is not equal to kinetic energy at the start (energy is lost)

True or false: linear momentum is only conserved in elastic collisions.

False.

Linear momentum is always conserved

The rate of change of momentum can also be described as...

Resultant force. f=ma, f=m(change in v)

What is impulse?

The change in momentum. F∆t = ∆mv.

What does the area underneath a force-time graph stand for?

Impulse, the change in momentum.

What is meant by the principle of conservation of energy?

Energy cannot be created or destroyed, only transferred.

Therefore the total in every closed system would always remain the same.

What is the equation used for the principle of conservation of momentum in one-dimensional collisions?

𝒎𝟏𝒖𝟏+𝒎𝟐𝒖𝟐=𝒎𝟏𝒗𝟏+𝒎𝟐𝒗