Further mechanics Flashcards
(4 cards)
1
Q
How to answer a 2d momentum question
A
1- Draw a diagram of the situation
2- Write out all known quantities
3- Momentum before and after in dimension 1
4- Momentum before and after in dimension 2
5- Rearrange to find unknown quantities
6- Redraw situation as a momentum triangle
7- Use Pythagoras and trig to calculate final vector
2
Q
What are elastic collisions
A
- Both KE and momentum are conserved
3
Q
What are inelastic collisions
A
- Momentum is conserved, not KE
- Lost energy goes to heat
4
Q
What happens in a perfectly inelastic collision
A
- Objects stick together
