Physics 11
Worksheet #1 - Force of Gravity
1. Find the force of gravity between two physics students that have masses of 74.0
kg and 82.5 kg if they are sitting 95.0 cm apart.
2.
A 1450 kg spacecraft is drifting in space.
the Earth is 3860 N.
The force of gravity between it and
a)
How far is it from the center of the Earth?
b)
How far is it above the surface of the Earth? (Earth radius = 6.38x106m)
3.
What would happen to the force of gravity on the spacecraft in question #2 if
the distance between the spacecraft and the center of the Earth was:
a)
Tripled?
b)
Halved?
4.
What is the force of gravity on a 24.0 kg table sitting on the Earth?
5.
If the weight of a classroom Physics textbook is 42 N, what is the books mass?
6.
If the textbook in question #5 was taken to the Moon, would its mass and/or
weight change?
7.
Complete the following table for these objects
“g” is the force of gravity per kilogram (N/kg)
Weight is the force of gravity (N) and can be found by F=mg
Object
Mass (kg)
Radius (m)
Moon
7.36x1022
1.74x106
Venus
4.87x1024
6.05x106
Earth
5.98x1024
6.38x106
Mars
6.40x1023
3.40x106
Jupiter
1.90x1027
7.15x107
Sun
1.99x1030
6.96x108
Gravitational
Field Strength
“g” at the
surface of the
object (N/kg)
Weight of an 80.0 kg
student standing on
this object (N)
8.
What is the Earth’s gravitational field strength “g” at the top of Mt. Everest,
which is 8400 m above sea level?
9.
What is the size of the force of gravity between the Earth and the Sun?
distance of 1.50x1011 m separates them.
A