Momentum
Solve the following momentum problems. Show your work.
1. If a 2-kg ball is thrown through the air at 20 m/s, what is the momentum of the ball?
2. If a bowling ball is rolling down the lane at 2.41 m/s, with a momentum of 11.76 kg m/s,
what is its mass?
3. If a 98-kg running back has a momentum of 842 kg m/s, what is his velocity?
4. Complete the table below calculating the missing values. No work must be shown!!
Use the information in the table above to answer the following questions
a. Which object has the greatest momentum?
b. Which object has the least momentum?
c. Why is the momentum for Object B greater than the momentum for Object A?
d. What factor causes Object D to have a greater momentum than Object C?
5. A large fish with a mass of 1-kg is in motion at 0.45 m/s when it encounters a small, 0.25
kg fish at rest. The larger fish swallows the smaller fish and continues in motion at a
0.36 m/s. Fill in the momentums before and after the collision. No work needed!
Law of Conservation of Momentum
1. A 3000-kg truck moving with a
velocity of 10 m/s hits a 1000-kg
parked car. The impact causes
the 1000-kg car to be set in
motion at 15 m/s. Fill in the
table with the correct values.
2. Determine the velocity of the truck immediately after the collision. p = mv
Use the Law of Conservation of Momentum to solve the following problems. Show Your Work!!
3. A 98-kg fullback is running along at 8.6 m/s when a 76-kg defensive back running in the
same direction jumps on his back. What is the speed of the two players immediately
after the tackle? (hint: add the masses of both players for m2)
4. Atti, the dog, has a mass of 15 kg. She is running at 3.0 m/s toward her master, Judy,
who has a mass of 40.0 kg, standing still on slippery ice. After Judy catches her leaping
dog, what is the speed of Judy and Atti after the catch? (hint: add masses of both for m2)
5. A 25-kg medicine ball is thrown at 3.2 m/s to a clown standing on a skateboard. The
clown catches the medicine ball and moves together with the ball at 1.1 m/s. What is
the final mass of the clown with the ball on the skateboard?
6. A 2.9-kg cart is originally moving at 0.26 m/s. Then a brick is placed on it and it slows
down to 0.15 m/s. What is the mass of the brick? (hint: you have to solve for m2 then
subtract the mass of the cart)
gravity
weight
distance
newtons
momentum
Newton's first law
Newton's second law
Newton's third law
projectile
centripetal force
air resistance
sliding friction
conservation of momentum
force
static friction
________________________ 1. The phrase "to every action there is an equal and opposite
reaction" is ___.
________________________ 2. A ball thrown across a football field is an example of a(n) ___.
________________________ 3. When an object moves in a circle, _____ acts to accelerate
the object towards the center of that circle.
________________________ 4. The Law of Inertia is another name for ____.
________________________ 5. A push or pull that one body exerts on another is a _____.
________________________ 6. A property of a moving object calculated from its mass and
velocity is ____.
________________________ 7. According to ____, when a bowling ball strikes the pins, the
momentum lost by the bowling ball is gained by the pins.
________________________ 8. ___ is the force that every object in the universe exerts on
every other object.
________________________ 9. An object's ____ is the measure of the gravity pulling on the
object's mass.
_______________________ 10. The amount of gravitational force between two objects
depend on their masses and the ____ between them.
_______________________ 11. Weight is measured in units of ___, while mass is measured in
kilograms.
_______________________ 12. Two surfaces that are not moving past each other have ____.
_______________________ 13. A box you are pushing across the floor has ____.
_______________________ 14. The equation F = m × a relates to ____.
_______________________ 15. The force exerted by air on a moving object is called ____.
16.
The balls in the figure above have the same mass. If the balls are dropped from the table at
the same time, which ball will hit the floor first?
17. Why don't the Action/Reaction forces in Newton's 3rd Law cancel out?
18. If a 2.2-kg ball is thrown through the air at 25 m/s, what is the momentum of
the ball? Show Work!
19. A 2.9-kg cart is originally moving at 0.26 m/s. Then a brick is placed on it and
it slows down to 0.15 m/s. What is the mass of the brick? (hint: you have to solve
for m2 then subtract the mass of the cart) Show Work!
20. Why would a flat sheet of paper and a wad of paper with the same mass not
fall through the air at the same rate?
21. When is something weightless? ___________________
22.
The acceleration due to gravity on Earth is _______m/s2.
23.
What are the four types of friction and how are they different?
24.
On the image to the write draw the reaction vector.
If the action statement is "bowling ball hits pin to the left."
Write the reaction statement___________________________________
Kevin pushes a 200 kg elephant on skateboards across the floor with 15N of
force. The friction opposing the motion is 5N.
25. Sketch a vector diagram on the picture to the right for
the applied force (A) & the force of friction (B)
26.
What is the net force on the elephant?____________
27.
What type of friction is described?______________________
28.
Calculate the acceleration of the elephant. (Use the Net Force) Show work