• A
• A & B
• A, B & D
• C

• True
• False
• Don't Know
• #### 3.  In a uniform circular motion

• velocity is constant
• acceleration is constant
• speed is constant
• All of the above

• 203 m
• 8163 m
• 80,003 m
• 23 m

• A
• B
• C
• D

• 5 m/s/s
• 0.2 m/s/s
• 15.8 m/s/s
• 11 m/s/s
• #### 7.  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.
• #### 8.  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
• #### 9.  A car moving around a curve at a constant speed of 150 mph is accelerating.

• True, because it is moving at a constant speed.
• True, because it is changing direction.
• False, because it is not a constant velocity.
• False, because it is moving at a constant speed.
• #### 10.  A car makes a left turn, a book on the front seat slides to the right...why?

• centripetal acceleration of the book
• centripetal force of the book
• will power
• inertia of the book
• #### 11.  Acceleration causes a change in velocity so acceleration can cause

• a change in speed only.
• a change in speed or direction.
• a change in direction only.
• #### 12.  What would act as the centripetal force for a car on a circular track?

• Friction
• Gravitation
• Tension
• None of These
• #### 13.  Determine the central angle if the arc length is 10 cm and the radius is 5 cm. Convert to degrees.

• not possible ... "s" is too small
• ≈ 114.6°
• 360°
• #### 14.  Centripetal acceleration acts towards the ___________ of the circular motion

• centre
• circumference
• #### 15.  A rubber stopper on the end of string is swung steadily in a horizontal circle. In one trial, it moves at speed v in a circle of radius r. In a second trial, it moves at a higher speed 3v in a circle of radius 3r. In the second trial the acceleration is

• the same as in the first trial
• three times larger
• one-third as large
• nine times larger
• One-ninth as large.

• A
• B
• C
• D
• E

• A
• B
• C
• D
• E
• #### 18.  An object in uniform circular motion is (choose all that apply)

• traveling at a constant speed
• accelerating
• not accelerating
• moving in one direction
• Both A & B

• #### 20.  A spin balancer rotates the wheel of a car at 500 revolutions per minute. What is the angular speed in degrees per second?

• 16.67 deg / sec
• 6,000 deg / 1 sec
• 3,000 deg / 1 sec
• 180,000 deg / 1 sec

• 64 m/s
• 45 m/s
• 32 m/s
• 23 m/s
• 16 m/s
• #### 22.  A horse gallops around a circular arena. The centripetal force on the horse is ___.

• directed outward
• tension
• directed toward the center of the arena
• 9.8 N

• True
• False
• #### 24.  For an object to be in uniform circular motion the direction of the acceleration is

• perpendicular to the direction of travel.
• parallel to the direction of travel.
• diagonally inwards between the direction of travel and the center of the circle.
• diagonally outwards away from the center of the circle but in the same direction of travel.
• diagonally inwards towards the center of the circle but opposite to the direction of the velocity.