Chapter 3

Question 1

The symbol representing the acceleration caused by gravity. It is equal to 22mi/hour per second or 32 ft/second per second or 9.8 m/second per second depending on the units.

Answer 1

g:

Question 2

A measure of the force of gravity pulling on an object.

Answer 2

weight

Question 3

Expressed by the mathematical formula F=GmM/d2 that describes the strength of the force of gravity between two objects of mass M and m separated between their centers by the distance d.

Answer 3

Law of gravity

Question 4

A number relating the strength of the gravitational force to the masses being attracted and their distance apart.

Answer 4

Gravitational Constant:

Question 5

Albert Einstein’s description of gravity that was published in 1915. This theory explains the relationship between the geometry of space and the flow of time in our universe.

Answer 5

General Theory of relativity

Question 6

A small ball is dropped from the edge of a cliff. One-tenth of a second later a much heavier ball is dropped from the same position. Ignoring the effects of air friction, the second ball overtakes the first.

Answer 6

false

Question 7

Although the moon is so far away, it’s gravitational pull still affects Earth.

Answer 7

true

Question 8

The force of gravity increases between objects as they get farther away from each other.

Answer 8

false

Question 9

Because the Moon orbits Earth at a constant speed, it travels in uniform motion.

Answer 9

false

Question 10

A cannon ball weighs more than a marble. This means it requires much less force to “fall” towards Earth at the same rate as a marble.

Answer 10

false

Question 11

The force of gravity on an object.

Answer 11

weight

Question 12

The mathematical formula F=GMm/d2 that describes the strength of the force of gravity between two objects of mass M and m separated between their centers by the distance d.

Answer 12

law of gravity

Question 13

The symbol representing the acceleration caused by gravity. It is equal to 22 mi/hour per second, 32 ft/second per second or 9.8 m/sec per second depending on the units.

Answer 13

g

Question 14

If a feather and a brick are dropped at the same height in a vacuum, then

Answer 14

they hit at the same time.

Question 15

When is the force of gravity greatest on a rock

Answer 15

when it is resting on the ground.

Question 16

Jane throws a rock horizontally off a cliff. How fast is the rock traveling downward after 5 seconds (ignoring air friction)?

Answer 16

110 mph

Question 17

Using the Principle of Position Symmetry, the gravitational force on an object near another planet would

Answer 17

depend on the masses of the planet and the object and the square of the distance between them.

Question 18

A baseball player throws a baseball horizontally at 100 mph. You drop a penny at the exact same height just as the ball leaves the baseball player’s hand. Air friction is negligible. What will happen?

Answer 18

The baseball has a greater force on it than the penny.