Mechanics - Momentum and Impulse Flashcards
What is the symbol for momentum?
p
What is the equation for momentum?
p=mv
Momentum = mass x velocity
What type of quantity is velocity?
Vector
What type of quantity is mass?
Scalar
What type of quantity is momentum?
Vector
1kg =
1000g
What is the simple equation for impulse?
I=Ft
Impulse = force x time
What type of quantity is foce?
Vector
What type of quantity is time?
Scalar
What type of quantity is impulse?
Vector
How can you calculate acceleration?
A = (v-u)/t
(Change in velocity ÷ time)
What simple equation should you always remember?
F=ma
What is the second equation for impulse?
I=m(v-u)
Impulse = mass(final velocity - initial velocity)
What is the third equation for impulse?
I=∆p
Impulse = change in momentum
Impulse = final momentum - initial momentum
What are the units of momentum?
Kgms^-1 or Ns
What are the units of mass?
Kg
What are the units of velocity?
ms^-1
What are the units of impulse?
Ns (newton seconds)
What are the units of force?
Newtons
What are the units of time?
Seconds
What are the units of acceleration
ms^-2
1 tonne =
1000kg
What do you need to consider with problems considering a wall?
If you are doing a problem that is dealing with a ball bouncing off a wall you can’t really apply the impulse momentum principle to it.
You need to find the impulse exerted on the ball by the wall
And (due to newtons 3rd principle) you know that the force will ber equal and opposite
What can you use to help solve collision problems?
The impulse momentum principle
What is the conservation of momentum principle?
Total momentum before impact = total momentum after an impact
How can you write the conservation of momentum in an equation?
what is the best way to format a question when using the conservation of momentum?
When using the conservation of momentum what do you need to remember to do?
Pick a positive direction
If a question asks for the velocity, what do you need to remember to do?
State the velocity and the direction
What is 1.3?
Everything is the same except you have vector values for momentum
