Momentum Basics
The equation for momentum
What is p = m x v (momentum = mass x velocity)
The equation(s) for impulse
What is I = F x t and/or I = (m2 x v2) - (m1 x v1)
(impulse = force x time and/or the change in momentum)
The equation for a perfectly inelastic collision
What is (m1 x v1) + (m2 x v2) = (m1+m2)vf
(initial momentum of object 1 plus initial momentum of object 2 = the mass of both objects x velocity of both objects combined)
The description of what occurs in a perfectly inelastic equation
What is two objects collide and stick together
A bomb (at rest) undergoes fission and splits into two fragments, one heavy and the other light. Which fragment has the greater momentum?
The both have the same (magnitude of) momentum
The momentum of a 10 kg object moving at a velocity of 5 m/s
What is 50 kg m/s
A force of 4 N is applied to a ball for 0.75 s. What is the impulse?
What is 3 kg m/s or 3 N s
The equation for BOTH inelastic and elastic collisions
What is (m1 x v1) + (m2 x v2) = (m1 x v1f) + (m2 x v2f)
(total initial momentum = total final momentum)
Polly Ester and Ray Ahn are doing the Elastic Collision lab on a low-friction track. Cart A has a mass of 1.00 kg and is moving rightward at 27.6 cm/s prior to the collision with Cart B. Cart B has a mass of 0.50 kg and is moving leftward with a speed of 42.9 cm/s. After the magnetic repulsion of the two carts, Cart A is moving leftward at 10.1 cm/s. Determine the post-collision speed and direction of cart B.
What is 32.5 cm/s (cart is moving right)
A Roller Derby exhibition recently came to town. They packed the gym for two consecutive weekend nights at South's field house. On Saturday evening, the 68-kg Anna Mosity was moving at 17 m/s to the right when she collided with 76-kg Sandra Day O'Klobber, who was moving to the right as well, at 12 m/s and directly in Anna's path. Anna jumped onto Sandra's back and the two continued moving together at the same speed. Determine their speed immediately after the collision.
What is 14.36 m/s
The velocity of an object with a momentum of 189 kg m/s with a mass of 15 kg.
What is 12.5 m/s
A car pulls a trailer with a force of 250 N. If the total impulse is 900,000 N*s, for how long is the force applied?
What is 3600 s
The equation for an explosion type collision
What is mtotal x vi = (m1 x v1f) + (m2 x v2f) ...
(total mass x initial velocity = momentum of all pieces post-explosion)
Bailey is on the tenth frame of her recent bowling competition and she needs to pick up the last pin for a spare and the first place trophy. She rolls the 7.05-kg ball down the lane and it hits the 1.52-kg pin head on. The ball was moving at 8.24 m/s before the collision. The pin went flying forward at 13.2 m/s. Determine the post-collision speed of the ball.
What is 5.39 m/s
Rex (m=86 kg) and Tex (92 kg) board the bumper cars at the local carnival. Rex is moving at a full speed of 2.05 m/s when he rear-ends Tex who is at rest in his path. Tex and his 125-kg car lunge forward at 1.40 m/s. Determine the post-collision speed of Rex and his 125-kg car.
What is 0.61 m/s
The mass of an object with a velocity of 10 m/s and a momentum of 207 kg m/s
What is 20.7 kg
A group of people are pushing a stalled car with a mass of 1100 kg. If they push with a net force of 350 Newtons for 10 seconds, what is the car’s final velocity?
What is 3.182 m/s
What is ALL COLLISIONS
An 82-kg male and a 48-kg female pair figure skating team are gliding across the ice at 7.4 m/s, preparing for a throw jump maneuver. The male skater tosses the female skater forward with a speed of 8.6 m/s. Determine the speed of the male skater immediately after the throw.
What is 6.7 m/s
A 1 kg firecracker explodes into two pieces. One piece has a mass of 0.4 kg and moves to the left at 3 m/s. What is the velocity and direction of the other piece?
What is 2.0 m/s (to the right)
A 1300 kg race car is traveling at 80 m/s while a 15,000 kg truck is traveling at 20 m/s. Which has the greater momentum?
What is the truck
Race car = 104,000 kg m/s
Truck = 300,000 kg m/s
A 0.105 kg hockey puck is traveling at 12 m/s when it is struck by a stick. As a result, the puck travels at 15 m/s in the opposite direction. If the contact between the stick and puck lasted 0.05 s, what was the force?
What is -56.7 N or kg m/s2
The type(s) of collisions in which kinetic energy is conserved.
What is elastic
Hayden (m=24.3-kg) is gliding along the sidewalk on his skateboard at 8.6 ft/s. As he travels under a low-hanging branch of the tree where Matthew is sitting, he grabs the 4.5-kg bag of soccer balls from Matthew's hands. Determine the speed of Hayden immediately after grabbing the bag of soccer balls.
What is 7.26 ft/s
Abbey and Mia are in the basement playing pool. On Abbey's recent shot, the cue ball was moving east at 82 cm/s when it struck the slower 5-ball moving in the same direction at 24 cm/s. The 5-ball immediately speeds up to 52 cm/s. Determine the post-collision speed of the cue ball.
What is 54 cm/s