Physics - Further motion concepts 2.4

What does momentum depend on? (2)

Mass of an object

velocity

The equation for momentum?

Momentum = mass x velocity

Unit for momentum

kg m/s

State their momentums

Orange = 10 kg m/s

Green = 10 kg m/s

Newton’s second law

The resultant force acting on an object is proportional to the rate of change of momentum p=mv of the object.

What car safety features increase the time it takes to stop a passenger in a collision? (2)

Crumple Zones

Air bags

State the law of conservation of momentum

the total momentum before and after an interaction are equal, provided that no external forces are acting on the objects

What happens in an elastic collision?

The total kinetic energy before and after the collision would be equal

What happens in an inelastic collision?

Kinetic energy is lost, and transferred into other energy like heat

What happens to momentum in an explosion?

Must be 0kg m/s before and after

State the further motion concept equation (2)

x =

State the further motion concept equation

v =

v = u + at

State the further motion concept equation

v² =

v² = u² + 2ax

State the definition of moment

A moment is a turning force

Unit for moment

Nm

State the principal of moments

When an object is balanced, the sum of the clockwise moments is equal to the sum of the anticlockwise moments