Momentum
Name one way you could increase an object's momentum.
1. Make the object more massive.
2. Make the object move faster.
A bus hits some dirt and changes its momentum from 12,000 kgm/s to 7,200 kgm/s.
1. What is the change in momentum of the bus?
2. What was the impulse on the bus?
1. -4800 kg m/s
2. -4800 kg m/s
What is the total momentum of the following system?
(Picture to follow)
- 5 kg m/s
100
B A C
An object has a momentum of 18.5 kg m/s. If the object is moving 6.2 m/s, what is the mass of the object?
2.98 kg
A 190 kg football player is moving at 7 m/s. During a collision he is brought to a complete stop.
1. Calculate the football player’s change in momentum?
2. Calculate the amount of force necessary to stop him in 0.4 seconds?
1. -1330 kg m/s
2. -3325 N
A running child of mass 40 kilograms is running with a velocity of 4 m/s due East. The kid jumps onto a 20 kilogram unicycle that is rolling in the parking lot at 2 m/s due East.
1. What is the total momentum of the kid/unicycle combined system before the kid jumps on?
2. What is the total momentum of the kid/unicycle combined system after the kid jumps on?
1. 200 kg m/s, East
2. 200 kg m/s, East
200
F = 12 N
t = 2 s
DAILY DOUBLE
Write both valid units for momentum.
kg m/s
Ns
Wendy hits a 0.05 kg golf ball, initially at rest on the tee, with a golf club, giving it a final speed of 75 m/s. If the club provides 1600 N of force onto the golf ball, how long were they in contact?
0.002 seconds
A 1400 kg red car traveling at 22 m/s to the East, collides into a 1500 kg blue car that is at rest. After the collision, the cars “stick” together, and slide off as one big mass. What is their velocity as they slide off?
10.6 m/s
DAILY DOUBLE
300
F = 6 N
J = 12 Ns
pfinal = 54 kg m/s
A 50 kg skater slows their speed from 10 m/s to 3 m/s. What is their change in momentum?
-350 kg m/s
DAILY DOUBLE
A force of 2000 N is applied for 2.5 seconds to a 2500 kg car. If the car has an initial speed of 3.0 m/s, what is the car’s final velocity?
5 m/s
One drives a 2 kg purple remote control car down the road with a very slow speed of 1.2 m/s. Goofing off, another student drives a 4 kg yellow remote control car with a velocity of 6.2 m/s down the SAME street! When the yellow RC Car overtakes the purple one, a collision happens.If the yellow RC car continues down the street after the collision, but with a speed of only 1.5 m/s. What would be the speed of the purple RC car?
10.6 m/s
400
m = 4 kg
J = 40 Ns
pfinal = 64 kg m/s
An snowman was traveling along the ground with a momentum of 12 kg m/s. Suddenly, the snowman started melting, losing half of his mass. He also started moving 3 times as fast. What would the new momentum of the snowman be?
18 kg m/s
A 2500 kg car is moving at 5.0 m/s towards a wall. It hits the wall and rebounds at 3.0 m/s in the other direction. The collision takes .50 seconds. How much force was on the car?
40,000 N
A soccer ball (0.5 kg) is kicked along the ground at a speed of 7 m/s. A basketball, with a mass of 1.5 kg is rolled TOWARDS the soccer ball with a velocity of 5 m/s (a head on collision). After the collision, the soccer ball bounces backwards with a velocity of 0.7 m/s. What is the final velocity of the basketball?
-2.43 m/s
500
Change in Velocity
B
B
B