17 notecards = 5 pages (4 cards per page)
A centripetal force does no work because
d. the force is perpendicular to the motion
A box is pulled across a table at a constant speed by a horizontal force parallel to the table in the direction of motion. A force performing no work during the motion is
c. the normal force of the table on the box
Which of the following must be true of a conservative force?
c. The potential energy may either increase or decrease when the force acts.
A force does work on an object if a component of the force
b. is parallel to the displacement of the object
Work is done when
a. the displacement is not zero
If the only force acting on an object is friction during a given physical process, which of the following assumptions must be made in regard to the objects kinetic energy?
b. the kinetic energy decreases.
The main difference between kinetic energy and potential energy is that
b. kinetic energy involves motion and potential energy involves position
The equation for determining gravitational potential energy is PE = mgh. Which factor(s)in this equation is(are) not a property of the object?
d. both g and h
In the presence of frictional force,
d. non-mechanical energy is no longer negligible and mechanical energy is not conserved.
Why doesn't the principle of mechanical energy conservation hold in situations when frictional forces are present?
a. kinetic energy is not simply converted to a form of potential energy
Which of the following are examples of conservable quantities?
c. mechanical energy and mass
Each of five satellites makes a circular orbit about an object that is much more massive than any of the satellites. The mass and orbital radius of each satellite is given below. Which satellite has the greatest speed?
b. mass = m, radius = 1/2 R
Two planets have the same size, but different masses, and no atmosphere. Which of the following would be the same for objects with equal mass on the surface of the two planets.
d. II and III only
A person weighing 800 Newtons on Earth travels to another planet with twice the mass and twice the radius of Earth. The person's weight on this other planet is most nearly
d. 400 N
Which of the following quantities is a scalar that is always positive or zero?
c. Kinetic energy
A rock is lifted for a certain time by a force F that is greater in magnitude than the rock's weight W. The change in kinetic energy of the rock during this time is equal to the
c. work done by (F - W)
Two artificial satellites, A and B, orbit the earth with radii of R and 2R respectively. What is the relationship between the accelerations of A and B.
e. a(B) = 1/4 a(A)