3/24/23, 8:19 PM
Enabling Assessment 4: Impulse and Momentum - S-EPHY001 CEE14 PHYSICS FOR ENGINEERS LEC 2nd Sem ( 2022-2023 )…
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S-EPHY001 CEE14 PHYSICS FOR ENGINEERS LEC 2nd Sem ( 2022-2023 )
Enabling Assessment 4: Impulse and Momentum
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Question 1
A Toyota (small car) strikes a Mack truck (large truck) head-on. They stick together after the collision. Defining the
system as the car plus the truck, total momentum and total energy are conserved.
Response: True
Question 2
The momentum change of an object is equal to the
Response: impulse acting on it
Question 3
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3/24/23, 8:19 PM
Enabling Assessment 4: Impulse and Momentum - S-EPHY001 CEE14 PHYSICS FOR ENGINEERS LEC 2nd Sem ( 2022-2023 )…
A car accelerates from rest. In doing so the absolute value of the car's momentum changes by a certain amount and
that of the Earth changes by a larger amount.
Response: False
Question 4
Suppose the entire population of the world gathers in one spot and, at the sounding of a prearranged signal,
everyone jumps up. While all the people are in the air, Earth recoils, like a rifle firing a bullet, with a change in
momentum equal to and opposite that of the people.
Response: True
Question 5
Padded dashboards in cars are safer in an accident than non-padded ones because passengers hitting thedashboard
encounter
Response: lengthened time of contact
Question 6
The impulse-momentum relationship is a direct result of
Response: Newton's 2nd law
Question 7
Whether a truck comes to a stop by crashing into a haystack or a brick wall, the impulse is
Response: both the same
Question 8
A 5000-kg freight car moving at 2 m/s collides with a 10,000-kg freight car at rest. They couple uponcollision and
move away at
Response: 2 m/s.
Question 9
Consider two carts, of masses m and 2m, at rest on an air track. If you push first one cart for 3 s and then the other
for the same length of time, exerting equal force on each, the kinetic energy of the light cart is smaller than the
kinetic energy of the heavy car.
Response: False
Question 10
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3/24/23, 8:19 PM
Enabling Assessment 4: Impulse and Momentum - S-EPHY001 CEE14 PHYSICS FOR ENGINEERS LEC 2nd Sem ( 2022-2023 )…
When a golf club hits a golf ball, the change in momentum of the ball is ___________ the change in momentum of
the club.
Response: equal to
Question 11
A golf ball is fired at a bowling ball initially at rest and bounces back elastically. Compared to the bowling ball, the
golf ball after the collision has less momentum but more kinetic energy.
Response: True
Question 12
A 90 kg halfback runs north and is tackled by a 120 kg opponent running south at 4 m/s. The collision is perfectly
inelastic. Just after the tackle, both players move at a velocity of 2 m/s north. Calculate the velocity of the 90 kg
player just before the tackle.
Response: 10 m/s
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Question 13
Which has a greater momentum—a truck with a mass of 2250 kg moving at a speed of 25 m/s or a car with amass
of 1210 kg moving at a speed of 51 m/s?
Response: the car has greater momentum of 56,250 kg-m/s
Question 14
A person is standing on a roller blades and is holding a heavy medicine ball. If he throws the ball horizontally to
the right, what will be the resulting motion?
Response: to the left
Question 15
If superman at rest in free space throws an asteroid that has more mass than superman, then which moves faster?
Response: superman
Question 16
A large heavy truck and a small baby carriage roll down a hill. Neglecting friction, at the bottom of the hill,the
baby carriage will likely have
Response: less momentum.
Question 17
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3/24/23, 8:19 PM
Enabling Assessment 4: Impulse and Momentum - S-EPHY001 CEE14 PHYSICS FOR ENGINEERS LEC 2nd Sem ( 2022-2023 )…
Skelly the skater travelling at high speed needs a certain amount of force to stop him. More stopping force is
needed if he has
Response: all of the above
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