• #### 1.  Earth revolves around the sun, centripetal force required is provided by:

• Frictional force
• Gravitational force
• Coulomb’s force
• Magnetic force

• 6.38×106
• 6.38×1024
• 6.0×106
• 6.0×1024

• 0o
• 45o
• 90o
• 180o

• 0o
• 45o
• 90o
• 180o

• Newton
• Coulomb
• Cavendish
• Faraday

• 6.38×106
• 6.38×1024
• 6.0×106
• 6.0×1024
• #### 7.  The gravitational force between two bodies depends upon the product of their masses in addition to:

• Square of the distance between them
• Shape of bodies
• Medium between them
• Sum of masses

• 203 m
• 8163 m
• 80,003 m
• 23 m
• #### 9.  What is the most direct cause of a car's centripetal acceleration as it rounds a curve?

• The force of the steering wheel
• The weight of the car.
• The normal force exerted by the road.
• The friction between the tires and the road.
• #### 10.  The velocity is always _____ to the line of a circle.

• outwards
• towards the center
• tangent
• faster

• A
• B
• C
• D

• A
• B
• C
• D

• A
• B
• C
• D

• 5 m/s/s
• 0.2 m/s/s
• 15.8 m/s/s
• 11 m/s/s
• #### 15.  What force keeps an object moving in a circle?

• centripetal force (inward)
• centrifugal force (outward)

• 2.4 m/s
• 3.6 m/s
• 3.9 m/s
• 4.2 m/s

• A
• B
• C
• D
• #### 18.  Two masses m and M are separated by a distance d. If the distance between the masses is increased to 3d, how does the gravitational force between them change?

• becomes 1/3 as great
• 1/9 as great
• 3x greater
• 9x greater
• #### 19.  What happens if you let go of the string when you spin the stopper around your head?

• the stopper continues moving in a circle
• the stopper moves in a straight line
• #### 20.  Two bugs ride a turntable which is rotating at a constant rate of 4 rad/s. Bug A is at a radius of 4 cm, while bug B is at a radius of 8 cm. Which of the following is true?

• Bug A has a greater angular velocity
• Bug B has a greater angular velocity.
• Bug A has a greater linear velocity.
• Bug B has a greater linear velocity.

• A
• B
• C
• D

• 360 degrees
• 2π radians
• π radians
• 2 radians
• #### 23.  The motion of the Moon around the Earth is an example of ____________.

• uniform action
• projectile motion
• rectilinear motion
• circular motion
• #### 24.  The wheels of a car have radius 0.330 m. and are rotating at 600.0 rpm. Determine the speed of the car in miles/hour to the nearest tenth. (Determine ω (angular velocity) first and then use v=ω⋅r and convert to km/hour)

• 11.88 km/hour
• 685.4 km/hour
• 74.64 km/hour
• 74640 km/hour

• 565.5 m/s
• 180 m/s
• 282.7 m/s
• 90 m/s

• A
• B
• C
• D

• m/s
• m/s2
• m.s2
• m/s.s
• #### 28.  What can be said of an object in uniform circular motion?

• It has a constant velocity.
• It is an example of Newton's First Law in the absence of a force.
• It has a constant tangential speed.
• none of the choices given

• A
• B
• C
• D
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