Momentum

Question 1

Momentum

Answer 1

Mass and velocity
Change in momentum could involve change in direction or velocity
Unbalanced forces cause a change in momentum

Question 2

Collisions

Car safety

Answer 2

Increase time taken for person to decelerate in collision
Longer impact time decreases impact force because of F=ma
Seat belts, inertia forces, fabric stretches
Airbags, smaller pressure due to big area
Crumple zones, energy is taken in by concertina

Question 3

Conservation of momentum

Answer 3

Total momentum before always equals total momentum after

Vectors

Question 4

Explosions

Answer 4

Momentum before=momentum after

Recoil, away that guns follow law of m

Question 5

Elastic and inelastic collisions

Answer 5

Elastic, if a ball wastes no KE energy when it hit the floor, would return to original height
Inelastic, energy wasted as heat when mets the floor, does not go back to original height