Physics 250 Final Exam Theory
Questions And Answers
You need to load a crate of mass m onto the bed of a truck. One
possibility is just to lift the crate straight up over a height h, equal to
height of the truck's bed. The force exert in this case is F1 and the
work one in this case is W1. The other possibility is to slight the
crate up a frictional ramp of length L. In this case, you exert force F2
and perform work W2. Which statement is true?
A. F1>F2 and W1>W2
B. F1=F2 and W1>W2
C. F1=F2 and W1=W2
D. F1>F2 and W1<W2
E. F1>F2 and W1=W2 -
correct answer ✅E
Identical forces act for the same length of time on two different
masses. The change in momentum of the smaller mass is:
A. Equal to the change in momentum of the larger mass
B. Larger than the change in momentum of the larger mass
C. Smaller than the change in momentum of the larger mass, but
not zero kg m/s
D. Cannot tell without knowing masses
E. Zero kg m/s -
correct answer ✅A
, Physics 250 Final Exam Theory
Questions And Answers
An inelastic collision between two objects is characterized by the
following:
A. Total momentum of the system is conserved
B. Total energy of the system is conserved
C. Total kinetic energy of the system remains constant
D. Both A and B are true
E. Both A and C are true -
correct answer ✅A
You throw a rudder ball at a downward angle so that when it hits
the ground, the ball bounces off with the same speed with which it
hit the ground. How could you increase the impulse the ground
exerts on the ball by the collision (assume you always throw the ball
at the same initial speed)?
A. Since the ball's speed does not change as a result of the collision,
the impulse exerted on it by the ground is the same regardless of
how it is thrown
B. By throwing the ball at a steeper angle (i.e. so its initial velocity is
closer to being directly down)
C. Since the ball's speed does not change as a result of the collision,
the impulse exerted on it by the ground is always 0Ns
Questions And Answers
You need to load a crate of mass m onto the bed of a truck. One
possibility is just to lift the crate straight up over a height h, equal to
height of the truck's bed. The force exert in this case is F1 and the
work one in this case is W1. The other possibility is to slight the
crate up a frictional ramp of length L. In this case, you exert force F2
and perform work W2. Which statement is true?
A. F1>F2 and W1>W2
B. F1=F2 and W1>W2
C. F1=F2 and W1=W2
D. F1>F2 and W1<W2
E. F1>F2 and W1=W2 -
correct answer ✅E
Identical forces act for the same length of time on two different
masses. The change in momentum of the smaller mass is:
A. Equal to the change in momentum of the larger mass
B. Larger than the change in momentum of the larger mass
C. Smaller than the change in momentum of the larger mass, but
not zero kg m/s
D. Cannot tell without knowing masses
E. Zero kg m/s -
correct answer ✅A
, Physics 250 Final Exam Theory
Questions And Answers
An inelastic collision between two objects is characterized by the
following:
A. Total momentum of the system is conserved
B. Total energy of the system is conserved
C. Total kinetic energy of the system remains constant
D. Both A and B are true
E. Both A and C are true -
correct answer ✅A
You throw a rudder ball at a downward angle so that when it hits
the ground, the ball bounces off with the same speed with which it
hit the ground. How could you increase the impulse the ground
exerts on the ball by the collision (assume you always throw the ball
at the same initial speed)?
A. Since the ball's speed does not change as a result of the collision,
the impulse exerted on it by the ground is the same regardless of
how it is thrown
B. By throwing the ball at a steeper angle (i.e. so its initial velocity is
closer to being directly down)
C. Since the ball's speed does not change as a result of the collision,
the impulse exerted on it by the ground is always 0Ns
