- If the momentum of an object changes and its mass remains constant, ...
Your answer:
it is accelerating or decelerating
its velocity is changing
both answers are correct
none of these are correct
- In order to increase the final momentum of a golf ball we could....
Your answer:
follow through when hitting the ball
all these answers are correct
Increase the force acting on it
increase the time of contact with the ball
- Suppose a girl is standing on a pond where there is no friction between her feet and the ice, In order to get off the ice, she can....
Your answer:
get on her hands and knees and crawl off the ice
throw something in the direction opposite to that she wants to go
walk very slowly on tiptoe
bend over touching the ice in front of her, then bring her feet to her hands
- Two objects collide with each other but one object has a much greater mass. During the collision the heavier mass has....
Your answer:
a smaller force acting on it and a smaller change in momentum
a smaller force acting on it and a greater change in momentum
an equal and opposite force acting on it but a smaller change in momentum
an equal and opposite force acting on and the same change in momentum
- The momentum change of an object is equal to:
Your answer:
object's mass times the force acting on it
the force acting on it times its velocity
impulse acting on it
velocity change of the object
- The reason padded dashboards are used in cars is that they...
Your answer:
look nice and feel good
decrease the impulse in a collision
decrease the momentum of a collision
increase the time of impact in a collision
- If an ball bounces off the ground rather than just stopping the force on the ball is...
Your answer:
less because the impulse is less
greater because the time of the collision is less
greater because the impulse is more
less because the time of the collision is more
- Suppose a cannon is made of a strong but very light material. Suppose that the cannonball is more massive than the cannon itself. For such a system...
Your answer:
the force on the cannonball would be greater than the force on the cannon
conservation of momentum and energy would not hold
the target would be a safer place than where the operator is located
recoil problems would be lessened
- A boxer will roll with the puch in order to...
Your answer:
stop being hit all together
increase the time of contact with the fist
reduce the change in momentum of the fist
reduce the impulse of the fist
- A 1 N apple falls to the ground. The apple hits the ground with an impact force of about..
Your answer:
2 N
9.8 N
Not enough information to say
1 N
- The area under a F-t graph represents..
Your answer:
change in momentum
work
mass
change in velocity
- A 10 kg bowling ball traveling at 4 m/s hits a 2 kg pin head on. If the pin starts moving forward at 6.7 m/s what is the velocity of the ball just after hitting the pin?
Your answer:
0 m/s
0.8 m/s
2.7 m/s
3.7 m/s
- Indiana Jones (75kg) jumps straight down into a runaway 300 kg mine car traveling at 20 m/s. What is the speed of the car after he lands in it?
Your answer:
20 m/s
80 m/s
5 m/s
16 m/s
- A small economy car (low mass) and a limousine (high mass) are pushed from rest across a parking lot, equal distances with equal forces. The car that receives the greater impulse is the...
Your answer:
small economy car
no answer
neither, same for each
limousine
- If all people, animals, trains and trucks all over the world began to walk or run towards the east, then...
Your answer:
the earth's spin would not be affected at all
no answer
the earth would spin a little bit slower
the earth would spin a little bit faster
- A karate expert executes a swift blow and severs a cement block with her bare hand.
Your answer:
The impulse on both the block and the expert's hand have the same magnitude
all the answers are correct
The time of impact on both the block and the expert's hand is the same
The force on both the block and the expert's hand have the same magnitude
- The force that accelerates a rocket into outer space is exerted on the rocket by the...
Your answer:
rocket's wings
atmosphere pressure
exhaust gasses
Earth's gravity
- A 100 kg free-floating astronaut fires 0.10 kg of gas at a speed of 50 m/s from her propulsion pistol. What is the astronaut's recoil speed?
Your answer:
50 m/s
none of these answers
0.05 m/s
10 m/s
- What difference in kick would you expect in firing a bullet versus firing a blank cartridge from the same gun?
Your answer:
Both would recoil the same because they have the same amount of gunpowder
Both would recoil the same because the impulses would be the same
The gun fired with the bullet would recoil more because the change in momentum of the bullet is greater than the blank
The gun fired with the blank cartridge would recoil more because the gun has less mass
- Why is more impulse delivered during a collision when bouncing occurs than during one when it doesn't?
Your answer:
the mass is greater
the change in momentum is greater
all of these answers are correct
the time for which the impulse acts is greater