P5 - Momentum Flashcards
What is the equation for momentum?
Mass (kg) x Velocity (m/s)
What does ‘conservation of momentum’ mean?
There is equal momentum before as at the end.
Why is the combined momentum of a bullet and a gun zero?
Because when a shot is fired, the bullet travels forward (+ve momentum) and the gun recoils backwards (-ve momentum) with equal momentum but in opposite directions - they cancel eachother out!
When something explodes, what is the total momentum of all the particles?
0 because momentum is conserved. At the start the momentum is zero. During the explosion, the particles fly outward in opposite directions and their momentums cancel each other out.
What is the unit for momentum?
kg m/s
A 65kg kangaroo is moving in a straight line at 10 m/s. Calculate its momentum.
650 kg m/s
What is the equation for force acting?
Change in momentum / Time taken for change to happen
What is the unit of force?
N
Momentum has size and speed but what doesn’t it have?
Direction
If one object has a mass of 30kg and another has a mass of 75kg, which will have the most momentum? If they were travelling at the same speed.
The 75kg one because the one with the greater mass will have a greater velocity so more momentum.
What type of theory is a kinetic theory?
A particle model
According to the kinetic theory, what do gases consist of?
Very small particles.
What does an decrease in volume to do to pressure?
Increases it.
Why do gas particles exert a force during collision?
because they have a mass.
How is an outward pressure created?
when gas particles collide with the walls of a sealed container.
