Ucm

Which statement is true about an object that is traveling in uniform circular motion?

• The speed of the object varies.
• The net force on the object is directed toward the center of the circular path.
• The direction of the object's velocity is constant.
• The net force on the object is directed away from the center of the circular path.

What is the direction of the acceleration at point A, if the ball is revolving clockwise?

• up
• right
• down
• left

What happens to an object's tangential speed as the radius decreases?

• It increases.

• It decreases.

• It remains unchanged.

You are making a circular turn in your car on a horizontal road when you hit a big patch of ice, causing the force of friction between the tires and the road to become zero. While the car is on the ice, it

• A) moves along a straight-line path away from the center of the circle.

• A) moves along a straight-line path toward the center of the circle.

• A) moves along a straight-line path in its original direction.

• A) continues to follow a circular path, but with a radius larger than the original radius.

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-2

A particle P is moving in a circle with uniform speed. Which one of the following diagrams correctly shows the direction of the acceleration a and velocity v of the particle at one instant of time?

• A
• B
• C
• D

What is the direction of the velocity at point B, if the ball is revolving clockwise?

• up
• right
• down
• left

What is the direction of the acceleration at point B, if the ball is revolving clockwise?

• up
• right
• down
• left

Tags

NGSS.HS-PS2-1

Centripetal acceleration always points

• in the direction of the object's motion
• in the opposite direction of the object's motion
• towards the center of the circle
• towards the outside of the circle

Which of the following is the best description of what is being depicted (only one answer is correct)?

• Tangential Velocity

• Centripetal Acceleration

• Axis of rotation

• Angular velocity

If the radius of the string is .3 meters long and the stopper makes 5 revolutions per second, what is the speed of the stopper? (Hint: C=2πr)

• 9.4 m/s
• 6.8 m/s
• 11.7 m/s
• 3.5 m/s