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What is the equation for momentum (kg m/s)?
Mass (kg) x Velocity (m/s) OR p = m x v
What do all moving objects have?
Momentum
How does momentum relate to mass and velocity?
The greater the mass of an object, or the greater its velocity, the more momentum the object has
What type of quantity is momentum?
A vector quantity - it has size and direction
How does the TOTAL momentum change before and after an event?
It doesn’t, in a closed system (no external forces acting on it), it stays the same before and after the event; this is called conservation of momentum
When an object is stationary, what is its momentum?
It has zero momentum
When an object is moving, what is its momentum?
p = m x v
What is the combined momentum of 2 balls when they collide (1 ball is stationary and the other is moving)?
It’s equal to the original momentum of the moving ball
REMEMBER, momentum before = …
Momentum after
What causes an objects momentum to change?
A resultant force acting on it
How does newtons 2nd law explain that a resultant force can change an object’s momentum?
N2ndLaw states f = m x a, acceleration is just change in velocity over time, so force = mass x change in velocity/time. Meaning that a force applied to an object over any time interval will change the object’s velocity Mass x change in velocity = change in momentum
What is impulse?
The change in an object’s momentum when a force is applied over time?
What is the equation for Newton’s Second Law of Motion relation to impulse and momentum?
