Impulse Momentum Theorem-Concepts
The equation used to represent impulse
f times delta t
A compact car, mass 725 kg, is moving at +100.0 km/h. What is it's momentum??
2.01 x 10^4 kgm/s
Define the conservation of momentum with words!!
The momentum of two objects in a system will not change after a collision.
A pool ball moving horizontally, strikes a stationary pool ball of the same size and they both go off in different directions. What can be said about the vertical components of each of the pool balls?
They need to add up to zero.
Person A, who has a mass of 60.0 kg, is riding at 25.0 m/s in his sports car when he must suddenly slam on the brakes to avoid hitting a dog who is crossing the road. He is wearing his seatbelt, which brings his body to a stop in 0.400s. What average force did the seatbelt exert on him?
What is 3750 N
The equation used to represent momentum
m times v
A compact car, mass 725 kg, is moving at +100.0 km/h. At what velocity is the momentum of a larger car, mass 2175 kg equal to that of the smaller car?
At 33.4 km/h
A car with mass of 1245 kg moving at 29 m/s, strikes a 2175 kg car at rest. If the two cars stick together, with what speed do they move?
10. m/s
If you were to draw the vectors (to scale) of a collision that results in two dimensions, describe what the outcome all of these problems would have in common?
would have a triangle...that is all the way connected. Showing that it does not change.
A tennis ball traveling at 10.0 m/s is returned by Person B. It leaves his racket with a speed of 36.0 m/s in the opposite direction from which it came. What is the change in momentum of the tennis ball?
2.8kgm/s
How are impulse and momentum related??
impulse is equal to the change in momentum
A snowmobile has a mass of 2.50 x 102 kg. A constant force is exerted on it for 60.0 s. The snow mobile’s initial velocity is 6.00 m/s and its final velocity 28.0 m/s. What is its change in momentum?
5.50 x 10^3 kgm/s
A 2575 kg van runs into the back of a 825 kg compact car at rest. They move off together at 8.5 m/s. Assuming no friction with the ground, find the initial speed.
11 m/s
If an 800.0 kg sports car slows to 13.0 m/s to check out an accident scene and the 1200.0 kg pick-up truck behind him continues traveling at 25.0 m/s, with what velocity will the two move if they lock bumpers after a rear-end collision.
20.2 m/s forward
Here's the scenerio: You pull the cart for 1.0 s exerting a 1.0 N force. Then, you pull the car for 2.0 s exerting about 0.50 N of force. Which one will have a greater velocity at the end?
they will both be the same.
A snowmobile has a mass of 2.50 x 102 kg. A constant force is exerted on it for 60.0 s. The snow mobile’s initial velocity is 6.00 m/s and its final velocity 28.0 m/s. What is the magnitude of the force exerted on it?
91.7 N
Two students on roller skates stand face-to-face then push each other away. One student has a mass of 90.0 kg and the other 60.0 kg. Find the ratio of their velocities just after their hands lose contact. Which student has the greater speed?
1:1.5 the student with the smaller mass.
A cue ball moving with 7.0 Ns of momentum strikes the nine-ball at rest. The nine-ball moves off with 2.0 Ns in the original direction of the cue ball and 2.0 Ns perpendicular to that direction. What is the momentum of the cue ball after the collision?
5.4 Ns at 22 degrees from the original direction.
Define the impulse momentum theorem. How can you express this using just words??
the change in force over time is equal to the change in momentum.
The brakes exert a 6.40 x 102 N force on a car weighing 15,680 N and moving at 20.0 m/s. The car finally stops. What is the change in the car's momentum?
-3.20 x 10^4 kgm/s
A 92 kg full back, running at 5.0 m/s, attempts to dive across the goal line for a touchdown. Just as he reaches the goal line, he is met head on in midair by two 75 kg linebackers, one moving at 2.0 m/s and the other at 4.0 m/s. If they all become entangled as one mass, with what velocity do they travel? Does the fullback score?
0.041 m/s yes
A cue ball, mass of .16 kg, rolling at 4.0 m/s, hits a stationary eight-ball of similar mass. If the cue ball travels at 45 degrees above its original path, and the eight-ball travels at 45 degrees below its original path, what is the velocity of each after the collision?
2.8 m/s
Running at 2.0 m/s, Person E, the 45.0 kg quarterback, collides with Person F the 90.0 kg tackle, who is traveling at 7.0 m/s in the other direction. Upon collision, Person F continues to travel forward at 1.0 m/s. How fast is Person E knocked backward?
10.0 m/s