AnswersPhysicsCircular Motion and Gravitation

Circular Motion and Gravitation — Test Answers

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1
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Which arrow shows the direction that the probe should be moving in order for it to enter the orbit?

A
W
B
X
C
Y
D
Z
2
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The car was rounding the curve when it hit an oil slick and went off the road. Which arrow shows the direction that the car moved in after hitting the oil slick?

A
W
B
X
C
Y
D
Z
3

Which describes the changes in Earth’s motion?

A
The speed increases from W to X because a component of the gravitational force acts in the direction opposite to the velocity.
B
The speed increases from X to W because a component of the gravitational force acts in the direction of the velocity.
C
The speed increases from X to W because a component of the gravitational force acts in the direction opposite to the velocity.
D
The speed increases from W to X because a component of the gravitational force acts in the direction of the velocity.
4

Which type of force should she place in the cell marked X?

A
friction
B
tension
C
normal
D
gravity
5

Based on the map, at which point is the object accelerating toward the right?

A
W
B
X
C
Y
D
Z
6

Which label belongs in each cell of the table?

A
W: Second X: Third Y: First
B
W: Third X: Second Y: First
C
W: First X: Second Y: Third
D
W: Third X: First Y: Second
7

Which conclusion is best supported by the image?

A
The speed of Earth is greater at W than at X because the force on Earth is greater at W than at X.
B
Earth is slowing down at W and speeding up at X because the force on Earth is greater at W than at X.
C
The speed of Earth is the same at W as at X because the force on Earth is the same at W as at X.
D
Earth is speeding up at W and slowing down at X because the force on Earth is greater at W than at X.
8

Two objects have the same center point of the circle, but are located at different positions away from the center point. Each object is moving with uniform circular motion. Which would describe the tangential speed of the objects?

A
both objects would have oscillating tangential speeds
B
both objects would have the same tangential speed
C
the object with the smaller radius has a faster tangential speed
D
the object with the larger radius has a faster tangential speed
10

The universal law of gravitation states that the force of attraction between two objects depends on which quantities?

A
the masses of the objects and the distance between them
B
the masses of the objects and their densities
C
the densities of the objects and their shapes
D
the distance between the objects and their shapes
11

What is the direction of the centripetal force when applied to an object?

A
the same direction as the object’s velocity
B
parallel with an object’s motion
C
perpendicular to an object’s motion
D
the direction opposite to the object’s velocity
12

What must be true of a force that causes an object to move in a circular motion?

A
It acts perpendicular to the velocity and is directed toward the center of the circle.
B
It acts perpendicular to the velocity and is directed away from the center of the circle.
C
It acts parallel to the velocity and is directed away from the center of the circle.
D
It acts parallel to the velocity and is directed toward the center of the circle.
13

The gravitational force between two objects is 2400 N. What will be the gravitational force between the objects if the mass of one object is doubled?

A
9600 N
B
1200 N
C
4800 N
D
600 N
14

Once an object enters orbit, what keeps the object moving sideways?

A
gravity
B
air resistance
C
inertia
D
centripetal force
15

What is the only force acting on an object orbiting Earth?

A
friction
B
inertia
C
air resistance
D
gravity
16

How does a centripetal force cause circular motion?

A
It acts in the direction of the object’s motion and causes the object to constantly change speed.
B
It acts at a right angle to the object’s motion and causes the object to constantly change speed.
C
It acts at a right angle to the object’s motion and causes the object to constantly change direction.
D
It acts in the direction of the object’s motion and causes the object to constantly change direction.
17

A bicycle tire has a radius of 0 point 2 3 m The tire spins at a constant speed with a centripetal acceleration of 42 m/s squared What is the tangential speed of the tire?

A
14 m/s
B
9 point 7 m/s
C
6 point 5 m/s
D
3 point 1 m/s
18

Question text not available

Answer:

revolution

19

Hakeem wants to explain why only one side of the moon is visible from Earth. Which comparison would provide the best support?

A
the orbital period of the moon with the rotational period of the Earth
B
the orbital period of Earth with the orbital period of the moon
C
the orbital period of Earth with the rotational period of the moon
D
the orbital period of the moon with the rotational period of the moon
20

Johannes Kepler is known for which discovery in astronomy?

A
discovering planets around other stars
B
determining planetary laws of motion
C
proposing the heliocentric model of the solar system
D
recording 20 years of data about planetary motion
21

The acceleration due to gravity on Mercury is 3 point 7 the fraction with numerator m and denominator s squared , which is about six times the acceleration due to gravity on Pluto. Which statement accurately compares the mass and weight of an object on these two planets?

A
An object weighs the same but has about one-sixth the mass on Pluto as on Mercury.
B
An object weighs about one-sixth as much but has the same mass on Pluto as on Mercury.
C
An object weighs about one-sixth as much and has about one-sixth the mass on Pluto as on Mercury.
D
An object weighs the same and has the same mass on Pluto as on Mercury.

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