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- 1. Multiple Choice
High and low tides are the regular pattern of rising and sinking ocean water levels. They are formed as a result of the gravitational forces of the moon and sun on Earth's oceans. The moon has a greater effect than the sun on the Earth's oceans. Why would the moon have a greater effect than the sun?
The moon is not as hot as the sun
The moon has less mass than the Earth
The moon has less mass than the sun
The moon is closer to Earth than the sun is
- 2. Multiple Choice
Melissa watched the path a baseball followed after a pitcher threw it. She noticed that the ball traveled horizontally away from the pitcher, as well as downward toward the ground. What force caused the ball to accelerate in the downward direction when it was thrown?
applied force
air resistance
electrical force
gravitational force
- 3. Multiple Choice
These objects are placed 1 meter apart.
Which of the following is true of this scenario?
The gravitational force between the two objects is very strong because they are close together
The gravitational force between the two objects is very weak because their masses are so small
No gravitational force exists between the two objects because they are not touching
No gravitational force exists between the two objects because their masses are so small
- 4. Multiple Choice
The dotted lines in the picture show orbital paths of objects.
Which statement is true about all of the orbits shown?
The force of gravity is what holds each object in its orbit
The size of an object determines the size of its orbit
The size of both an object and the object it orbits are equal
All orbiting objects follow an elliptical path
- 5. Multiple Choice
The law of universal gravitation says all bodies attract each other. If you drop a cup, it falls to Earth. Why doesn't the gravitational attraction between your hand and the cup keep the cup from falling?
The law of universal gravitation only applies to planets in space
There is a gravitational attraction between you and the cup, but Earth's gravity is stronger, so Earth's gravity pulls the cup down
The gravitational attraction between you and the cup is so strong that the force pushes the cup down
There is no gravitational attraction between you and the cup, so Earth's gravity pulls the cup down
- 6. Multiple Choice
What is gravity?
the force that pushes all objects toward Earth
the force that pulls all objects toward one another
a magnetic force that is strongest at Earth's poles
a stream of charged particles from the sun to the Earth
- 7. Multiple Choice
A skydiver jumps out of a plane. She falls downward at a very fast speed. When she opens her parachute, she slows down. What force pulled the skydiver to the ground?
friction
gravity
air resistance
parachute pull
- 8. Multiple Choice
Which statement about the universality of gravity is untrue?
The gravitational force between two objects depends only on their masses
The gravitational force between two objects increases if the mass of one object increases
The gravitational force between two objects increases if the distance between objects decreases
Any two objects that have mass also have a force of gravity acting between them, no matter how far apart they are
- 9. Multiple Choice
Two objects have a certain gravitational force between them. What would happen if the mass of one of the objects suddenly increased?
The mass of the other object would increase
The distance between the objects would increase
The gravitational force of the objects would remain constant
The gravitational force between the two objects would increase
- 10. Multiple Choice
Which of the following would exert the greatest gravitational force on a body?
a bar magnet
a molecule
a person
a planet
- 11. Multiple Choice
What is true of an object that is in free fall?
No forces are acting on it
Only the force of gravity is acting on it
The forces of thrust and gravity balance one another out
The forces of air resistance and gravity balance one another
- 12. Multiple Choice
What is the gravitational force acting on an object that has a mass of 10 kg?
0.2 kg
9.8 kg
10 kg
98 kg
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