Momentum

Question 1

Law of conservation of momentum

Answer 1

the total momentum before collision is equal to the total momentum after collision

Question 2

Types of momentum

Answer 2

Explosion, elastic collision and inelastic collision

Question 3

Definition, formula and unit of momentum

Answer 3

mass in motion
Formula= p(momentum) = mXv
unit: kgm/s

Question 4

Elastic collision

Answer 4

MaVa + MbVb = MaVa + MbVb

Question 5

Inelastic collision

Answer 5

MaVa + MbVb = (MaMb)V

Question 6

Explosion

Answer 6

MaVa + MbVb = MaVa + MbVb
0 = MaVa + MbVb
MaVa = -MbVb (final)

Question 7

definition, formula and unit of impulse

Answer 7

change in momentum
formula: Ft = mv-mu
Unit: kgm/s, Ns (newton second)

Question 8

definition, formula and unit of impulsive force

Answer 8

The RATE of change in momentum
formula: F = (mv-mu)/t
unit: Newton, N

Question 9

Application of impulse-momentum

Answer 9

eg: Car safety
1. airbag
2. seatbelt
3. brakes
4. crumple zone (reduces impact force and increases contact time)

Question 10

Formula for moment

Answer 10

Force x distance
*not sure if coming out