Rotation

Which of the following is the unit for angular displacement?

• meters
• seconds
• radians
• radians per second

A rod rotates about a pivot at its center at 2 rads/s. Its angular velocity increases to 14 rads/s in 3 s. Find the rod's angular acceleration

• 2 rad/s/s
• 4 rad/s/s
• 6 rad/s/s
• 8 rad/s/s

A record on a turntable is spinning and is coming to rest. If the angular velocity is 20.0 rad/s and the record slows at a rate of - 5 rad/s/s, how long does it take the record to come to rest? 

• 2 s
• 4 s
• 12 s 
• 8 s 

Tags

NGSS.HS-PS3-2

A ball attached to a string and rotates in a circle. If it takes 1.00 s to complete one revolution, what is the angular velocity of the ball?

• 3.14 rad/s
• 6.28 rad/s
• 9.42 rad/s
• 12.6 rad/s

Torque is the rotational analog of which of the following quantities?

• kinetic energy
• linear momentum
• force
• acceleration

An ice skater performs a fast spin by pulling her outstretched arms down and close to her body. What happens to her angular momentum? 

• increases 
• decreases 
• stays the same

An experiment is performed in a physics class where three objects- a hoop, a cylinder and a solid sphere, roll down an incline of height, H without slipping. Which of the three objects reaches the bottom of their inclined planes first? 

• hoop
• cylinder
• solid sphere

A spinning skater draws in her outstretched arms and thereby reducing her moment of inertia by a factor of 2.  Determine how her rotational velocity changes. 

• It halves
• It is tripled
• It is doubled
• It is 1/3

Determine the moment of inertia of a 5 kg bowling ball that has a radius of 0.3 m. Assume that the bowling ball is a solid sphere. I=2/5MR^2

• 0.18 kg m^2
• 5 kg m^2
• 1.5 kg m^2
• 0.30 kg m^2

A 2.0 kg hoop rolls to the right with a constant translational speed of 6.0 m/s. What is the total kinetic energy of this hoop arrangement? I=1/2MR^2

• 36 J
• 54 J
• 96 J
• 140 J