Topic 6 Flashcards
What is impulse?
Impulse is equal to the change of momentum
State the equation used to calculate the impulse of a force acting over a time
Impulse = FΔt
If there is a fixed change of momentum that must occur, how do you reduce the force that is exerted in the process?
Increase the length of time over which the change of momentum occurs
What is the conservation of linear momenutm?
The total momentum before an event must be equal to the total momentum after an event, assuming no external forces act
State the conservation of linear momentum in equation form
m₁v₁ = m₂v₂
What is an elastic collision?
A collision in which kinetic energy is conserved
What is an inelastic collision?
A collision in which kinetic energy is not conserved but instead converted to other forms
State the equation used to calculate angular velocity
ω = v/r
Angular velocity = linear velocity / radius
What is the time period of a circular orbit with angular velocity ω?
T = 2π/ω
What is required for an object to move with circular motion?
A centripetal force
In what direction does a centripetal force act?
Perpendicular to the direction of the object’s motion, towards the centre of the circular path
What equation is used to calculate a centripetal force?
F =mv^2/r
F =mrω^2
What are radians a measure of?
Radians are a measure of angle
How many radians form a full circle?
2π radians
What is the equation for kinetic energy of a non-relativistic particle?
E = p^2/2m
