Clicker Questions

If an object moves in uniform circular motion what can be said?

 

  1. The velocity is constant
  2. The speed is constant
  3. The acceleration is constant
  4. The net force is constant
  5. The magnitude of the displacement is constant

What is the speed of a point on the tip of a 3-cm-long second hand of a clock?

 

  1. 1.57 m/s
  2. 1.57 x 10-3 m/s
  3. 6.28 x 10-4 m/s
  4. 3.14 x 10-5 m/s
  5. 3.14 x 10-3 m/s

A car travels around a circular corner of radius r at constant speed. The corner is not banked. Which force is responsible for keeping the car on the road?

 

  1. Normal
  2. Centripetal
  3. Friction
  4. Gravity
  5. Force of acceleration

A ball is rolling on a horizontal table on the inside of a hula-hoop of radius r. At what speed must the ball be moving so that the normal force from the hoop is equal to the normal force from the floor?

 

 

 

Assume the ball is rolling counter-clock wise and is located at the dot on the figure when the loop is removed. Sketch the trajectory of the ball after the removal of the loop. 

The ball and loop are now placed vertically. A rocket makes sure the ball is always moving at a constant speed. At what point(s) is there only one force in the radial direction? Draw the free body diagram for point C.

 

What should the axis for the FBD at point C be labeled?

A roller coaster goes through a loop-the-loop of radius r. At the top of the loop (point A), what is the direction of the acceleration?

At point A, what must the speed be to feel momentarily weightless?

A car is rolling over the top of a hill at speed v. At this instant,

 

  1. n > w
  2. n < w
  3. n = w
  4. We can’t tell about n without knowing v.

A car travels around a frictionless banked circular corner of radius r at constant speed. Which force has a radial component?

  1. Normal
  2. Centripetal
  3. Friction
  4. Gravity
  5. Force of acceleration

The ball and loop are now placed vertically. A rocket makes sure the ball is always moving at a constant speed. At what point(s) is there only one force in the radial direction?

 

 

Draw the free body diagram for point C.

 

What should the axis for the FBD at point C be labeled?

Other Activities

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