Chapter 4- Collisions Flashcards
Unit of momentum
Ns
Kgms-1
Momentum equation
Momentum = mass x velocity P= mv
Is momentum scalar or a vector
Vector (has direction)
Momentum is c…
Conserved
A simple collision between trolleys on a friction- compensated slope
Trolley a pushed so that interrupt of card cuts across light beam with trolley moving at a constant velocity down the friction- compensated slope. The time the light beam is interrupted is recorded electronically and the constant velocity is calculated
Trolley a has cork with pin
To stick into cork (coupled) to trolley b
Velocity of combined is calculated as interior or card on trolley a passes through the second light beam
Momentum before the collision =
Momentum after the collision
The principle of conservation of linear momentum
States that in any interaction between bodies, linear momentum is conserved, provided that no resultant external force acts on the body
Collusion experiments can be simulated with
Gliders on linear air tracks (friction is negligible)
Sticky tack used to stick gliders together
As momentum is a vector quality, if momentum is assigned positive value
In left direction, then must be negative in right direction
Impulse equation
Force x time
Change in momentum
Newton’s second law of motion
States that the resultant force exerted on a body is directly proportional to the rate of change if linear momentum of the body
Resultant force =
Change in momentum / time
Momentum in conserved system means
Change in momentum of a woman is equal and opposite to that of the man
Recoil
Pushing one another apart
Impulse unit
Ns
