Circular Motion and Gravitation

Centripetal acceleration is always directed

A. away from the center of the circular path

B. toward the center of the circular path

C. tangent to the circular path

D. None of the above – it varies

Centripetal force is always directed

A. away from the center of the circular path

B. toward the center of the circular path

C. tangent to the circular path

D. None of the above – it varies

The speed of an object in circular motion is directed

A. away from the center of the circular path

B. toward the center of the circular path

C. tangent to the circular path

D. None of the above – it varies

If the mass of an object moving in circular motion is tripled and the radius and speed

remain constant, the centripetal force

A. triples

B. is 1/3 as much

C. is nine times as much

D. is 1/9 as much

E. remains the same

The period for an object that goes around a circle 10 times in 5 sec

has a period ofA. 0.5 sec

B. 2 sec

C. 15 sec

D. 50 sec

If the speed of an object moving in circular motion is tripled and the mass and radius

remain constant, the centripetal force

A. triples

B. is 1/3 as much

C. is 9 times as much

D. is 1/9 as much

E. remains the same

The unit for centripetal force is

A. m/s

B. m/s2

C. N

D. Nm

The unit for centripetal acceleration is

A. m/s

B. m/s2

C. N

D. Nm

The source of centripetal force for a car going around a curve on a flat road

A. tension

B. friction

C. gravity

D. inertia

The source of centripetal force for the earth moving around the sun is

A. tension

B. friction

C. gravity

D. inertia

The source of centripetal force for a mass being twirled on the end of a

string is

A. tension

B. friction

C. gravity

D. inertia

Centripetal force is directly related to ____and inversely related to ___.

A. Radius, mass

B. Mass and speed, radius

C. Radius, mass and speed squared

D. Mass and speed squared, radius

[Default][MC Any][MC All]

If both masses are doubled and distance between them remains the

same, the force of gravity is

A. doubled

B. ½ as much

C. quadrupled

D. ¼ as much

E. the same

If the distance between the two masses is tripled and their masses remain the

same, the force of gravity is

A. tripled

B. 1/3 as much

C. nine times as much

D. 1/9 as much

E. the same

If an astronaut weighs 550 N on earth and she is at a distance that is double

the earth’s radius, what would she weigh at that distance?

A. 138 N

B. 275 N

C. 550 N

D. 1100 N

E. 2200 N

Which way does the force of gravity act?

A. Away from each object

B. Toward each object

C. Same direction for each objecct

If a gravitational force exists between two bodies of different masses, which

one feels the stronger force?

A. The less massive object

B. The more massive object

C. Each feels the same force

D. The more dense object

Andrea weighs 450 N on earth. How much would she weigh on

Planet Z if the acceleration due to gravity on Planet Z is 4.67 m/s2?

A. 96.4 N

B. 2100 N

C. 156 N

D. 214 N

The mass of the moon is 7.3 x 1022 kg and the mass of the earth is 5.98 x 1024 kg. If

their centers are 3.6 x 108 m apart, what is the gravitational force between them?

A. 2.25 x 1052 NB. 6.24 x 1011 N C. 2.25 x 1020 N D. [6.02 x 1024 N

Find the distance between a 0.82 kg bowling pin and a 0.795 kg

boling pin if the force of attraction is 6.75 x 10-10 N.

A. 0.254 m

B. 0.0644 m

C. 15.5 m

D. 3.94 m

Find the centripetal force provided by friction on a 45 kg skater as she rounds a curve of radius 12 m at a

speed of 8 m/s.A. 2.5 N

B. 30 N

C. 240 N

D. 75 N

A 70.0 kg child sits on the outer edge of a carousel. If the centripetal force acting on her due to friction is 2710 N

and her speed is 8.80 m/s, how far from the center is she located?

A. 2.0 mB. 0.5 mC. 0.227 mD. 0.0286 m

The Millenium Falcon has to orbit Nabu before landing. If the distance of 4562 km

from the center of Nabu and has a centripetal acceleration of 4.42 m/s2,

what is its orbital speed?A. 560 m/sB. 1060 m/sC. 4490 m/sD. 20,164 N

A 1.2 kg mass is attached to a string 1.0 long and swings in a horizontal circle at a rate of 8.0 turns in 6.0 s.

What is the speed of the mass?

A. 4.71 m/s

B. 1.33 m/s

C. 4.19 m/s

D. 8.38 m/s