Q.1
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
Q.2
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.
Q.3
A spin balancer rotates the wheel of a car atrevolutions 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
Q.4
A grindstone spinning at the rate of 8.3 rev/s has what approximate angular speed?
  • 3.2 rad/s
  • 26 rad/s
  • 52 rad/s
  • 81 rad/s
Q.5
Calculate the amount of centripetal force it takes for a softball pitcher to rotate a ball with a velocity of 3 m/s if the ball weigh 0 .kg and her arm is 0.meters long.
  • 0.38
  • 1.23
  • 0.55
  • 1.66 N
Q.6
Determine the linear velocity of the tips of the blades for a ceiling fan with 2.m blades rotating at 45.rpm. (give in SI Units)
  • 565.5 m/s
  • 180 m/s
  • 282.7 m/s
  • 90 m/s
Q.7
The wheels of a car have radius 0.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
Q.8
Calculate the mass of an object if it tookN to rotate it in a circle with a radius of 2 meters with a velocity of 4 m/s
  • 4.1 kg
  • 3.6 kg
  • 2.5 kg
  • 1.8 kg
Q.9
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.
Q.10
Determine the central angle if the arc length iscm and the radius is 5 cm. Convert to degrees.
  • 2°
  • not possible ... "s" is too small
  • ≈ 114.6°
  • 360°
Q.11
Centripetal acceleration acts towards the ___________ of the circular motion
  • centre
  • circumference
Q.12
Centripetal force is...
  • the resultant force acting on a body moving at constant speed in a circle
  • the outwards force acting on a body moving at constant speed in a circle
Q.13
Calculate the velocity of an object moved around a circle with a radius of 1.m and an acceleration of 3.5 m/s2.
  • 2.4 m/s
  • 3.6 m/s
  • 3.9 m/s
  • 4.2 m/s
Q.14
A 1.3 m long fishing line rated as "lb test" that can stand a force oflb (44.N) is attached to a rock of mass 0.5 kg. The maximum speed at which the rock can be rotated without breaking the line is __________.
  • 10.75 ms-1
  • 10.95 m/s
Q.15
An object is moving round a horizontal circle of radius 0.m, at a constant angular frequency ofrpm. The centripetal acceleration of the object is ___________.
  • 3.53 rad s-1
  • 3.73 rad/s
Q.16
A particle moves in a horizontal circle of radius 0.m with a constant speed and a period of revolution of 0.s. The linear velocity of the particle is ____________.
  • 188.50 m/s
  • 188.70 ms-1
Q.17
What's the centripetal force of a 0.2 kg yoyo spun in a circle with a radius of .7 meters at a velocity of 3 m/s?
  • 2.05 N
  • 2.57 N
  • 2.90 N
  • 3.13 N
Q.18
Calculate the centripetal force required to make a 5 kg ball move 4 m/s in a circle with a radius of 2 m.
  • 10 N
  • 20 N
  • 30 N
  • 40  N
Q.19
You are moving a ball in a circle usingN of centripetal force. What would the force be if you doubled the radius of the circle.
  • 18 N
  • 36 N
  • 72 N
  • 144 N
Q.20
When an object is in circular motion it is constantly changing its velocity.
  • True
  • False
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