Momentum
Impulse
Units
Collisions
Potpourri
100
When do objects have no momentum?
When they aren't moving. Velocity = 0
100
What two variables multiplied together represent impulse?
Force x time
100
What is the unit(s) for momentum?
kg m/s
100
What type of collision occurs when a bowling ball hits the pins?
Elastic collision
100
What force do we neglect when solving conservation of momentum problems?
Friction
200
An eagle drops a fish while flying. As the fish falls freely to Earth, what happens to its momentum?
It increases
200
How can you reduce the force felt when objects change their momentum?
Have the force act over a longer period of time
200
What is the unit(s) for impulse?
N s
200
During which type of collision is momentum conserved?
Momentum is conserved in both elastic and inelastic collisions.
200
Name three vector measurements.
Acceleration, velocity, weight, force, momentum
300
What is the momentum of a 30 kg boy running 2 m/s?
60 kg m/s
300
A constant braking force of 10 N applied for 5 seconds is used to stop a 2.5 kg cart traveling 20 m/s. What is the magnitude of the impulse applied to stop the cart?
50 N s
300
What is the unit for energy?
Joules (J)
300
During which type of collision is kinetic energy conserved?
Elastic collisions
300
A toy cannon is at rest on a frictionless surface. Once fired, the cannonball has a momentum of 100 kg m/s east. What is the momentum of the 1,000 kg cannon?
-100 kg m/s west
400
What is the velocity of a car with a mass of 1,500 kg and a momentum of 30,000 kg m/s?
20 m/s
400
An 18 N s impulse is applied for 3 seconds. What was the magnitude of the force applied?
6 N
400
What is the unit of Force?
Newton (N)
400
What is the velocity after the collision?
4 m/s east (right)
400
For each collision below, state if it is elastic or inelastic:
a. bowling
b. football tackle
c. Newton's cradle
d. pool
e. catching a baseball
f. a dog catching a frisbee
a. elastic
b. inelastic
c. elastic
d. elastic
e. inelastic
f. inelastic
500
What is the mass of truck with a momentum of 45,000 kg m/s and a velocity of 25 m/s?
1,800 kg
500
A 0.1 kg bullet is brought to rest by an impulse of 50 N s. What was the initial speed of the bullet?
500 m/s
500
What are two units used to measure Power?
Watts (W) kilowatts (kW) Gigawatts (GW)
Horsepower (hp)
500
If the post collision velocity of the car is -10 m/s, what is the post collision velocity of the truck?
-10 m/s
500
State Newton's 3 laws of motion.
1. Law of inertia: objects at rest stay at rest and objects in motion stay in motion until acted on by an unbalanced force
2. F = mass x acceleration
3. Every action (force) has an equal and opposite reaction (force)