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Momentum and impulse
Terms in this set (42)
What is one way to define momentum
the quantity of a mass in motion
What has more momentum: a Volkswagen Beetle going 55 mph or a fully-loaded Mac dump truck going 55 mph?
The Mac dump truck has more momentum because of its larger mass
(T/F?) An object that is stationary has momentum
(T/F?) An object that is more massive than another object will always have more momentum?
False, the less massive object may just be traveling much faster than the more massive object
What factor(s) affect the amount of momentum that an object has?
Mass and Velocity
Which of the following is the correct unit of measurement for Momentum? N-sec;N m/s; kg m/s; kg m/s^2; kg m/s/s; N m
kg m/s and N sec
Momentum is a vector because?
velocity has direction
(T/F?) Mass is a vector.
False, mass is a scalar quantity.
(T/F?) Velocity is a vector.
True, velocity needs direction.
A 5 kg bowling ball travels down the lane at 3 m/s. What is its momentum?
A 40 kg student runs at 5 m/s to the right. Her momentum is?
A 50 kg student runs at 4 m/s to the left. His momentum is?
A 100 kg student has 200kg m/s of momenta, what velocity is he traveling at?
A car has 20,000kg m/s of momenta and is traveling at 10m/s, what is its mass?
(T/F?) The two students above have the SAME momentum as one another. (From the 40 kg and the 50 kg equation)
False, they have the same magnitude but differ in direction of the momentum.
The product of Force times Time is equal to?
the impulse acting on the object
When I multiply a ForcexTime , the units of measurement are?
N s, which is the same as the kg m/s
Which has a greater impulse: Object #1 that has a 1000 N force act for 15 seconds or the object #2 that has a 100 N force act for 40 seconds?
(T/F?) All impulses are the same
False, impulse is the result of Force AND the time in which the force acts, so they are not always the same at all
A force of 25 N acts on a ball for .2 seconds. What impulse does the ball receive?
5 N s
A 100 N force acts on the ball for .1 seconds. What impulse does the ball receive?
10 N s
A 10 N force acts for 1/4 of a minute. What impulse does the object receive?
150 N s
A ball receives an impulse of 50 N s when pushed with a 5 N force. How long did the force push the ball?
If impulse is Fxt and Fxt= the change in momentum (P):(T/F?) Impulse=change in momentum?
The units of measurement for Impulse are N s; (T/F?): The N s is euqal to that of a kg m/s which says that Impulse=Change in Momentum.
True, a N s is the same as kg m/s and Impulse IS equal to the Change in Momentum
Explain: An object that receives the greatest Impulse...
Receives the greatest Change in Momentum
A 1000 kg car receives an impulse of -5N s. What is its change in momentum?
-5 kg m/s
A 10 N force pushes a 500g box for .5 seconds. What is the change in velocity of the box?
A 35 N force pushes an object for .2 seconds from rest to 2m/s. What is the mass of the object?
How much force is needed to speed up a 90 kg preson from 2 m/s to 8 m/s in 1/2 a second?
Explain why: An egg doesn't break when thrown into a sheet is the same concept as to why a person is not injured in a car accident where an airbag is deployed.
Both objects had the force necessary to stop their motions in a large enough time to minimize damage to them
How do BOTH scenarios above deal with a change in momentum? (Referring to the egg thrown into sheet compared to person and airbag situation)
Both involve a change in momentum by having a Force exerted over an extended/longer period of time
How do BOTH scenarios illustrate what an impulse is? (Still referring to the egg thrown into sheet compared to person and airbag situation)
Impulse is a Force x Time: so the increase in time decreases the force acting upon the object
Which of the following increases the time of a collision involving car accidents, windshield, brick wall? (Curumple zone, seat belt, air bag, or anti-lock breaks)
Crumple zone, seat belt and airbag
If I (blank) the time of the collision, I decrease the amount of force acting upon an object.
(T/F?) Momentum is ALWAYS conserved?
Momentum BEFORE a collision is (blank) to the momentum AFTER the collision.
If the momentum of a car is 5000 kg m/s before a collision with a stationary car during a perfectly elastic collision that leaves the first car motionless, then the total momentum after the collision with the second car is?
Before a collision, Car #1 with a momentum of 22kg m/s hits Car #2 that has a momentum of 4kg m/s. After the collision, Car#1 has a momentum of 18kg m/s. What is the momentum of Car #2
Car A ( mass of 1000kg) is stopped at a stoplight before it is collided with Car B (mass of 2000kg) that is traveling at 4m/s just before the collision. After the collision, Car A is traveling at 1m/s, what is the velocity of Car B AFTER the collision?
3.5m/s in the direction that Car B was traveling
Two high schoolers are on stationary scooters and student #1 gives a push to the student #2. Student #1 has a mass of 85kg and Student #2 a mass of 68kg . Student #1 travels to the right with a velocity of 1.3m/s. what is the velocity of Student #2?
Two railroad cars collide. Car #1 has a mass of 1200kg and is traveling to the right at 5m/s. Car #2 is twice as massive and travels to the left at 3m/s. After the collision, the cars stick together. What is the velocity of the railroad cars AFTER the collision?
-.3m/s, or .3m/s to the left
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