Consider a situation where you exert a force F on a crate of mass m, moving it at a speed v a distance d across a floor in a time interval t. The quantity 1/2 mv2 is
a. the kinetic energy of the crate
b. the potential energy of the crate
c. the linear momentum of the crate
d. the work you do on the crate
e. the power you supply to the crate
[Ques. 2] Consider a situation where you exert a force F on a crate of mass m, moving it at a speed v a distance d across a floor in a time interval t. The quantity Fd is
a. the kinetic energy of the crate
b. the potential energy of the crate
c. the linear momentum of the crate
d. the work you do on the crate
e. the power you supply to the crate
[Ques. 3] Consider a situation where a skater pulls her arms inward, causing her rotation rate to speed up. Kinetic energy
a. is definitely conserved
b. is definitely not conserved
c. may or may not be conserved
d. none of the above
[Ques. 4] Consider a situation where a skater pulls her arms inward, causing her rotation rate to speed up. Linear momentum
a. is definitely conserved
b. is definitely not conserved
c. may or may not be conserved
d. none of the above
[Ques. 5] Consider a situation where a skater pulls her arms inward, causing her rotation rate to speed up. Angular momentum
a. is definitely conserved
b. is definitely not conserved
c. may or may not be conserved
d. none of the above
[Ques. 6] Consider a situation where two moving objects collide and rebound from each other. For a body oscillating at the end of a spring, the energy is
a. kinetic energy
b. elastic potential energy
c. gravitational potential energy
d. all of the above
e. none of the above
[Ques. 7] Consider a situation where two moving objects collide and rebound from each other. The energy of a ball rolling up an inclined plane
a. is entirely kinetic
b. is entirely potential
c. is both kinetic and potential
d. none of the above
[Ques. 8] Consider a situation where two moving objects collide and rebound from each other. Which of the following is not an example of potential energy?
a. The energy stored in a pile driver.
b. The energy stored in a stretched spring.
c. The energy of a body moving across a horizontal surface.
d. The energy in the water at the top of a waterfall.
[Ques. 9] Consider a situation where two moving objects collide and rebound from each other. Internal energy
a. remains constant
b. decreases
c. increases
d. varies but in a way that cannot be predicted
[Ques. 10] Consider a situation where two moving objects collide and rebound from each other. Linear momentum
a. is definitely conserved
b. is definitely not conserved
c. may or may not be conserved, depending on the nature of the collision
d. none of the above
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