M1, C1 - Momentum & Impulse Flashcards
What is the equation for momentum
momentum = mass x velocity
What is the unit of momentum
Ns
OR
kgms^-1
What is the equation for impulse (2)
Impulse = force x time
Impulse = final momentum - initial momentum
Impulse = change in momentum
Impulse = ft = mv - mu
What is the unit for impulse
Ns
How many kgs are in a tonne
1000kg = 1 tonne
If a ball gives an impulse I to a wall, what impulse does the wall give to the ball
I in the opposite direction
What is true of the magnitude and direction of impulses given to each other by colliding objects
They are equal and opposite
What is the formula for conservation of linear momentum
Total momentum before impact = total momentum after impact
m1u1 + m2u2 = m1v1 + m2v2
If you are asked to find the magnitude of the impulse given by A to B, what can you find instead which gives the same answer
The magnitude of the impulse given by B to A
If a string goes taught, what can we treat the two particles either side of the string as
1 particle
How do you find the magnitude of an impulse transmitted through a string when it goes taut
Find the tension away from the particle
When giving an answer of velocity, what must you include
The direction
(whether an impulse causes a change in direction)
How do you find the magnitude and direction of an impulse
Magnitude - Pythagoras
Direction - trigonometry
What does it means if two particles coalesce
The unite into one particle
When using vectors for impulses, do you have to change the signs to make a direction positive / negative when particles change direction
NO
The vector of the speed will already show the direction
