# Circular Motion And Gravitation Test! Physics Trivia Questions Quiz

16 Questions | Total Attempts: 526  Settings  .

• 1.
A ball is whirled on a string, then the string breaks. What causes the ball to move off in a straight line?
• A.

Centripetal acceleration

• B.

Centripetal force

• C.

Centrifugal force

• D.

Inertia

• 2.
When a car makes a sharp left turn, what causes the passengers to move toward the right side of the car?
• A.

Centripetal acceleration

• B.

Centripetal force

• C.

Centrifugal force

• D.

Inertia

• 3.
What term describes a force that causes an object to move in a circular path?
• A.

Circular force

• B.

Centripetal acceleration

• C.

Centripetal force

• D.

Centrifugal force

• 4.
A centripetal force acts
• A.

In the same direction as tangential speed

• B.

In the direction opposite tangential speed

• C.

Perpendicular to the plane of motion

• D.

Perpendicular to the tangential speed but in the same plane

• 5.
Which of the following is due to inertia?
• A.

A ball whirled in a circular motion stays in one plane.

• B.

A ball whirled in a circular motion experiences centripetal acceleration directed toward the center of motion.

• C.

A ball whirled in a circular motion experiences a centripetal force directed toward the center of motion.

• D.

A ball whirled in a circular motion will move off in a straight line if the string breaks.

• 6.
When calculating the gravitational force between two extended bodies, you should measure the distance
• A.

From the closest points on each body

• B.

From the most distant points on each body

• C.

From the center of each body

• D.

From the center of one body to the closest point on the other body

• 7.
What is the centripetal force that holds planets in orbit?
• A.

Inertia

• B.

Gravitational force

• C.

Planetary force

• D.

Kepler's force

• 8.
The force that Earth exerts on the moon
• A.

Is greater than the force the moon exerts on Earth

• B.

Is less than the force the moon exerts on Earth

• C.

Is equal in magnitude to the force the moon exerts on Earth

• D.

Causes tides

• 9.
How does the gravitational force between two objects change if the distance between the objects doubles?
• A.

The force decreases by a factor of 4

• B.

The force decreases by a factor of 2

• C.

The force increases by a factor of 2

• D.

The force increases by a factor of 4

• 10.
The law of universal gravitation states that
• A.

Two objects always exert gravitational forces on each other.

• B.

The force of gravity depends on the mass and the distance between the two objects

• C.

All objects fall at different rates on earth.

• D.

Both a and b.

• 11.
The most violent part of a hurricane is at the edge of the hurricane’s eye. This region, called the eyewall, can have winds with speeds of more than 300 km/h. Suppose winds in a hurricane’s eyewall have a tangential speed of 82.2 m/s. If the eyewall is 25 km from the center of the hurricane, what is the magnitude of the centripetal acceleration of particles in the eyewall?
• A.

0.27 m/s2

• B.

270.3 m/s2

• C.

0.003 m/s2

• D.

3.3 m/s2

• 12.
Because of the conditions that give rise to them, tornadoes do not have the widespread destructive effects of hurricanes. Nevertheless, the winds encountered in some tornadoes are even greater than those at the eyewall of a hurricane. Suppose a small pebble is swept up in a tornado. The pebble is 3.81 m from the center of the tornado and has a tangential speed equal to that of the surrounding wind: 124 m/s. What is the magnitude of the centripetal acceleration of the pebble?
• A.

32.5 m/s2

• B.

8.54 m/s2

• C.

1059.2 m/s2

• D.

4035.7 m/s2

• 13.
A model airplane with a mass of 3.2 kg moves in a circular path with a radius of 12 m. If the airplane’s speed is 45 m/s, how large is the force that the control line exerts on the plane to keep it moving in a circle?
• A.

12 N

• B.

540 N

• C.

3.6 N

• D.

1728 N

• 14.
A 45 kg child riding a Ferris wheel has a tangential speed of 8.5 m/s. Find the magnitude of the centripetal force on the child if the distance from the child to the axis of the wheel is 18 m.
• A.

180.6 N

• B.

8128.1 N

• C.

120 N

• D.

21.3 N

• 15.
The sun has a mass of 2.0 x 1030 kg and a radius of 7.0 x 105 km. What mass must be located at the sun’s surface for a gravitational force of 470 N to exist between the mass and the sun?
• A.

1.73 x 10 ^-23 kg

• B.

1.73 kg

• C.

1.73 x 10^-6 kg

• D.

1.73 x 10^-34 kg

• 16.
Deimos, a satellite of Mars, has an average radius of 6.3 km. If the gravitational force between Deimos and a 3.0 kg rock at its surface is 2.5 ´10-2 N, what is the mass of Deimos?
• A.

4.96 x 10^15 kg

• B.

7.87 x 10^11 kg

• C.

4.96 x 10^25 kg

• D.

4.96 x 10^-21 kg

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