Physics 2 autumn term

Question 1

What is momentum?

Answer 1

momentum (p) = mass (m) * velocity (v)
ΣF prop. ( Δp)/( Δt)
It is a vector quantity.

Question 2

Question: Car of mass 800kg moving at 30ms^-1 brought by breaking force of 1200N.

Answer 2

initial momentum -> p=mv -> 800*30=2400kgms^-1

time taken to stop ΣF= Δp/ Δt -> 1200=2400/t = 20s

Question 3

What is impulse?

Answer 3

Δp or Δ(mv). measured in Ns.

Question 4

Conservation of linear momentum

Answer 4

The total linear momentum of an isolated system of bodies remains constant.

Question 5

What are suvat eq?

Answer 5

Equations of uniform acceleration. Thus only applies when acceleration is constant.
s = displacement, u = initial velocity, v = final velocity, a = acceleration, t = time.
Used for projectile motion.