Momentum Basics
If you decrease the velocity does the momentum increase or decrease?
Decrease
A 2500 kg car is parked in the driveway, what is its momentum?
0 kg m/s
Cart A with a mass of 2 kg and an initial velocity of 5 m/s to the right collides with Cart B with a mass of 1 kg and an initial velocity of 3 m/s to the left.
After the collision, Cart A has a velocity of 0.3 to the left, and Cart B has a velocity of 7.6 m/s to the right.
Was momentum conserved?
Yes
What causes the Momentum to change?
Impulse
A 0.43-kg soccer ball is kicked with a velocity of 28 m/s, what is it's momentum?
12.04 kg m/s
The Hulk tosses a 200 kg rock with a speed of 30.0m/s at Ironman. Ironman, initially at rest, is struck by and carried away by the rock. Iron man has a mass of 150kg. What is the combined speed of iron man and the rock after the collision?
17.1 m/s
Which ball has the greatest momentum?
Soccer ball: m= 0.4 kg, v = 30 m/s
Baseball: m = 0.1 kg, v = 40 m/s
Bowling ball: m = 5 kg, v = 2 m/s
Soccer ball
12 kg m/s
When would momentum not be conserved?
When there is a net force on the system.
A 0.046 kg tennis ball is launched from a 1.35 kg homemade cannon. If the cannon recoils with a speed of 2.1 m/s, determine the muzzle speed of the tennis ball.
62 m/s
If the mass increases but the velocity stays the same, what happens to the momentum?
It increases
Cart A with a mass of 2 kg and an initial velocity of 4 m/s to the right collides with Cart B with a mass of 1 kg and an initial velocity of 2 m/s to the left.
After the collision, the carts stick together and have a final velocity of 2 m/s to the right.
Was momentum conserved?
Yes
A 3000-kg truck moving with a velocity of 10 m/s hits a 1000-kg parked car. The impact causes the car to be set in motion at 15 m/s. Assuming that momentum is conserved during the collision, determine the velocity of the truck immediately after the collision.
5.0 m/s