Impulse
Momentum & Energy
Collisions
Graphs
Energy Conservation
100
The units for momentum and impulse
kg m/s or N-s
100
True or False: Momentum is a scalar quantity.
False, momentum is a vector!
100
An object with a mass of 10kg moving right at 10m/s collides with an object with a mass of 20kg moving 3m/s to the left.
What will the final momentum of the system be after the collision.
Momentum= 40 kg.m/s right
100
The y-axis represents POWER and the x-axis is TIME.
What is the average Force applied?
F=0.5N
100
The ball in the pendulum is released from position 1 At position 2:
Gravitational potential energy _____ decreases/increases/stays same
Kinetic Energy_________ decreases/increases/stays same
Mechanical Energy__________ decreases/increases/stays same
Gravitational energy decreases while Kinetic Energy increases and Mechanical energy stays the same.
200
A 10 N force acts on a ball for 2 seconds. What is the impulse?
J=20Ns
200
Calculate the momentum of 14 kg sloth moving at a velocity of 2.0 m/s to the right
28 kg m/s to the right
200
A firecracker explodes and exerts equal and opposite forces on two cans. Assuming the system of two cans to be isolated, the post-explosion momentum of the system is ____.
more, less or zero
Zero
200
Determine the Impulse from the graph.
+8 kg m/s
200
How much work is needed to pull a spring with a spring constant of 200 N/m a distance of 25 cm?
PEsp=6.25J
300
This case has the largest impulse
Case B
300
Two different arrows are shot.
Arrow 1: m = 2 kg, v = +10 m/s
Arrow 2: m = 1 kg, v = -20 m/s
Compare momentum and kinetic energy.
Momentum is the same in magnitude and opposite in direction. Arrow 2 has a greater kinetic energy.
300
A rifle initially at rest shoots a 0.1kg bullet with a velocity v=100m/s. If the mass of the rifle is 1kg. What is the recoil velocity of the rifle?
V=10m/s
300
The plot on the ___ (left or right) could be a graph for kinetic energy and speed and the plot on the ___ (left or right) could be a graph for kinetic energy and mass.
right/left
300
A hovering helicopter drops a 20 kg mass. Said mass hits the ground while going 30 m/s. How high up was the helicopter flying?
Height=46m
400
If a force of 100 N is applied to a 0.5kg baseball initially at rest for 0.1 seconds, what is the final velocity of the baseball?
Vf=20m/s
400
If we double the velocity of an object, Momentum will_____ and Kinetic Energy_______
Doubles / Quadruples
400
A 3 kg cart moving at 2 m/s collides with a 1 kg cart at rest and sticks.
What is the Final velocity?
Vf=1.5m/s
400
What is the work done on the object during the 5 meter displacement shown in the graph above?
W=12 J
400
A 1kg mass has a height h=10m at point A. What is the height at point F where the mass was observed to move with a kinetic energy KE=40J?
h=6m
500
A 2kg ball hits a wall moving at 10m/s to the right and bounces of with 5m/s to the left. If the colision lasted 0.1 seconds.
What is the average Force applied?
F=-300N(to the left)
500
A worker exerts 40 W of power while lifting a 10.0 N box to a height of 2.0 m. It takes this much time.
t=0.5s
500
An object with a mass of 10kg moving right at 10m/s collides and sticks with an object with a mass of 20kg moving 3m/s to the left.
What will the final velocity of the combined objects be after the collision.
Vf=1.3m/s
500
If a moving object of 2 kg moves with a speed of 4 m/s when it undergoes the force in the graph (in the same direction as the original velocity), determine its final velocity.
+10 m/s
500
We push a 3kg box initially at rest with a force F=100N for a distance d=2m. If 50J of energy was lost due to Friction. What is the box's final velocity.
V=10m/s