# PSC 2121 Lecture Notes - Lecture 1: Bowling Ball

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Course PHYSICAL SCIENCE PSC2121
Working problems
Chapter 4: Gravity, Projectiles and Satellites
1) According to Newton, the greater the masses of interacting objects, the
a. less the gravitational force between them.
b. greater the gravitational force between them.
c. greater the force between them by the square of the masses.
2) What is the force of gravity on a 500-N woman standing on Earth's surface?
a. 50 N
b. 250 N
c. 500 N
d. 598 N
e. 5000 N
3) If the mass of Earth somehow increased with no change in radius, your weight would
a. increase also.
b. decrease.
c. remain the same.
4) If your mass remained the same while the mass of Earth doubled while staying the same
size, your weight would
a. be the same.
b. double.
c. quadruple.
d. be eight times as much as now.
e. none of the above
5) Consider two planets in space that gravitationally attract each other. If the masses of both
planets are doubled, and the distance between them doesn't change, then the force
between them is
a. one-quarter.
b. half as much.
c. twice as much.
d. four times as much.
e. none of the above
6) If the Earth had twice its present radius and twice its present mass, what would happen to
your weight? Explain.
7) Two objects move toward each other due to gravity. As the objects get closer and closer,
the force between them
a. increases.
b. decreases.
c. remains constant.
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8) Two objects move toward each other due to gravity. As the objects get closer and closer,
the acceleration of each
a. increases.
b. decreases.
c. remains constant.
9) If Earth's mass decreased to one-half its original mass with no change in radius, your
weight would
a. decrease to one-quarter.
b. decrease to one-half.
c. remain the same.
d. none of the above
10) If the masses of two planets doubles and the distance between them also doubles, the
force between them would be
a. one-quarter.
b. half as much.
c. twice as much.
d. four times as much.
e. none of the above
11) If the radius of the Earth somehow decreased with no change in mass, your weight would
a. increase.
b. not change.
c. decrease.
12) If the Sun were twice as massive,
a. its pull on the Earth would double.
b. Earth's pull on the Sun would double.
c. both
d. neither
13) A woman who normally weighs 400 N stands on top of a very tall ladder so she is one
Earth-radius above Earth's surface. What is her weigh there?
a. zero
b. 100 N
c. 200 N
d. 400 N
e. none of the above
14) A very massive object A and a less massive object B move toward each other under the
influence of gravity. Which force, if either, is greater?
a. the force on A
b. the force on B
c. both forces are the same
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