Momentum
What is the equation for momentum?
p=mv
If you have the Impulse and Force what can you find?
Time
According to the impulse-momentum theorem, airbags reduce force on passengers by _________.
increasing the time it takes to stop
This is the product of an object's mass and velocity.
What is momentum?
Why is it harder to stop a 500 kg object moving at 50 m/s compared to an identical object moving at 30 m/s?
The faster one has more momentum.
A ball is thrown at a wall with a momentum of 3 kg*m/s. It bounces back without losing energy. What is the change in momentum? (think about direction)
-6 kg*m/s
This is the product of force and time.
What is impulse?
This is the unit for momentum.
What is kilogram meters per second (kg*m/s)?
What do you get when you take momentum divided by velocity?
Mass
Name 3 factors that affect momentum.
mass, speed, and direction
This a collision where objects bounce apart and kinetic energy is conserved.
Elastic collision
This is the variable (symbol) for Momentum. (hint - nobody knows why)
What is p?
A .25kg marble is rolling on the floor at 2m/s, what is the momentum?
.5 kg m/s
If a 2N force is applied on an object for 10 seconds what is the Impulse
20 N s
If the change in momentum is 10 kg m/s, then what is the Impulse?
10 kg m/s
This is a collision where the objects stick together after colliding.
Inelastic collision
A 2 kg ball moving at 4 m/s collides elastically with another identical ball at rest. What will be the velocity of the first ball after the collision?
0 m/s (at rest)
Two football players collide as one tackles the other. What happens to the total momentum of the two players.
Total stays the same.
Impulse is equal to a change in what value?
What causes Momentum to change?
Impulse (or a net force being exerted)
What law says the total momentum of a system before an event is the same as after the event?
Law of Conservation of Momentum
A boy on ice skates stands in the middle of an ice rink (no friction). If he throws a football toward the north, what direction will the boy move after the throw?
South