PHSC 1211 Review II (Ch. 3-4) Kaviratna
* Be able to define the following
(Get comfortable with mathematical formulas and their applications)
Work, Potential energy, Kinetic Energy, Momentum, Power, impulse, conservation of
momentum and energy
* Understand the conceptual meaning of all of the above (e.g.: Can a moving object have momentum
but not kinetic energy)
*Newton's Law of Gravitation and satellite motion; know the formula and inverse-square law (no
calculations; but qualitatively).
* Projectile motion, satellite motion (both circular and elliptical
Sample questions:
1. Planets would crash into the sun if it weren't for
a. their tangential velocities
b. their vast distances from the sun
c. the fact that they are beyond the main pull of Sun's gravity
d. their relatively small masses
2. An object is placed exactly half way between the earth and the moon. The object will fall
toward the
a. Moon
b. Earth
c. Neither of these
3. Newton's law of universal gravitation is believed to be applicable
a. on Earth only
b. on Earth and Moon only
c. to the solar system only
d. throughout the universe
4. When the distance between two stars decrease by half, the force between them
a. one forth of its present value
b. increase to four times as much
c. the as its present value
d. twice its present value
5. The fastest moving planet in a solar system is
a. the smallest planet
b. the most massive planet
c. the planet nearest the Sun
d. the planet farthest from the Sun
6. Early bird communication satellite hovers over the same point of earth's equator
indefinitely. This is because
a. forces other than earth's gravity act on it
b. it pulls as hard on the earth as earth pulls on it
c. it is beyond the main pull of earth's gravity
d. it is kept aloft by ground control
c. It's orbital period is 24 hours
7. Exert 200J in 100 s and your power output is
a. 300 W
b. 1/2 W
c. 2 W
d. 20000 W
8. Give an explanation of why a cannonball will have a greater velocity from a long-barreled
cannon than a shorter cannon.
9. Why does the force of gravity do no work on a bowling ball rolling along a bowling alley?
10. What is the kinetic energy of a 20 kg dog that is running with a speed of 9.0 m/s?
