1
Q
What is the equation for impulse?
A
- ΔP = FΔt
- F = ma
- F = m (v-u) / t
- F = ΔP / t
- This is Newtons Second Law of motion
2
Q
How do you calculate Momentum in 2D?
A
- Break it down into the horizontal and vertical components
- Remember your components of forces rules
- Tanx = Sinx / Cosx
- If you are not given a value for mass the likelyhood is it will cancel
3
Q
How do you know if a collision is elastic or inelastic?
A
- If elastic then Total KE before = Total KE after
- If inelastic then Total KE before ≠ Total KE after
4
Q
What is the equation for KE of a non relativistic particle?
A
- Ek = p2 / 2m
5
Q
How do you derive Ek = p2 / 2m?
A
- p = mv
- p2 = m2v2
- So p2/2m = m2v2 / 2m
- = 1/2 mv2
- Hence Ek = p2 / 2m
6
Q
How do you convert degrees to radians?
A
- θ * π / 180
7
Q
How do you convert radians to degrees?
A
- θ * 180 / π
8
Q
What is angular velocity?
A
- ω = θ / t
- Angular velocity is the rate of change of angle measured in rad s-1
9
Q
What are the equations for angular velocity?
A
- v = ωr
- T = 2π / ω
10
Q
How do you derive a = v2 / r
A
11
Q
What is angular displacement?
A
- θ = s / r
- Angular displacement = Displacement / Radius
12
Q
What is required to maintain circular motion?
A
- A centripetal force provided by the resultant force acting on an object towards the centre of the circle
- Without this the object will continue on a path at a tangent to the circle
13
Q
What are the equations for centripetal force?
A
- F = ma
- F = mv2 / r
- F = mrω2
