Physics 2204
Universal Gravity WS
Name:___________________
Multiple Choice:
1. How will the magnitude of the gravitational force, F, between two objects change if one of the
masses is doubled and the radius is halved?
(A)
(B)
(C)
(D)
0.5F
F
2F
8F
2. What is the separation distance between two 180 kg objects that experience a gravitational force of
2.00 × 10 -4 N?
(A)
(B)
(C)
(D)
0.011 m
0.10 m
9.6 m
93 m
3. A 16.5 kg mass and a 25.0 kg mass experience a gravitational force of attraction of 1.36 x 10 -7 N.
What is the distance between the centres of their masses?
(A)
(B)
(C)
(D)
0.202 m
0.450 m
2.22 m
4.94 m
4. What happens to the gravitational force of attraction between two objects if the mass of one of the
objects doubles?
(A)
(B)
(C)
(D)
decreases by a factor of 2
decreases by a factor of 4
increases by a factor of 2
increases by a factor of 4
Physics 2204
Universal Gravity WS
Name:___________________
5. What happens to the force of gravity acting between two masses if their separation increases by a
factor of 2?
(A)
(B)
(C)
(D)
Decreases by a factor of 2
Decreases by a factor of 4
Increases by a factor of 2
Increases by a factor of 4
Long Answer:
1. Two equal masses are located some distance apart. The gravitational force between them is 400 N.
What will be the new gravitational force between them after each change? (Assume that the
objects are returned to their original state each time.)
(A)
(B)
(C)
(D)
(E)
(F)
(G)
The mass of one object is doubled.
The mass of both objects is doubled.
The mass of one object is doubled and the mass of the second object is tripled.
The distance between them is doubled.
The distance between them is increased by a factor of 4.
The distance is cut in half.
The distance is reduced to one-quarter.
2. What is the force of gravitational attraction between 1.8 x 108 kg supertankers moored so their
centres are 94 meters apart?
3. The force of gravitational attraction between two masses is 36 N. What will be the force if one mass
is doubled and the distance between them is tripled?
4. Calculate the gravitational force of attraction between two objects of masses 900g and 400g
respectively, placed with their centres 30 cm apart.
6. What is the force of attraction on an 85 kg astronaut if his distance above the surface of the earth is
3 500 km.