Laws of motion and momentum (C7) Flashcards
1
Q
Newtons first law
A
object will not accelerate unless acted on by a force
2
Q
Newtons second law
A
Force is equal to the change in momentum over time - infers that if the mass is constant F=ma
3
Q
Which law states that every force has an equal and opposite reaction
A
Newtons third law
4
Q
What can be infered from NIII
A
same size
same type
different object
opposite direction
5
Q
What is the law of the conservation of momentum
A
the momentum in a closed system is constant
6
Q
What happens in an inelastic collision
A
momentum is conserved
KE is not conserved
7
Q
What happens in an elastic collision
A
Momentum is conserved
KE is conserved
8
Q
What is impulse
A
change in momentum
9
Q
Unit for impules
A
Ns = kgm/s
10
Q
What is F=ma a special case of?
A
F= dp/dt
