AP Physics Mechanics of Rotation

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.

Which of the following is the unit for centripetal force?

• J

• m/s²

• kg⋅m/s

• N

How does the speed in Case A compare to the speed in Case B?

• two times

• one fourth times

• four times

• one half times

Tags

NGSS.HS-PS2-1

When a student stands on a rotating table, the frictional force exerted on the student by the table is

• greater in magnitude than the frictional force exerted on the table by the student

• less in magnitude than the frictional force exerted on the table by the student

• equal in magnitude than the frictional force exerted on the table by the student

• directed away from the center of the table

Tags

NGSS.HS-PS2-1

A car goes around a curve of radius r at a constant speed v. The coefficient of static friction between the tires and the surface is µ. What is the maximum value of the car’s velocity in order to prevent car from skidding of the road?

• (µrg)²

• µ r/g

• √urg

• g/ µr

Tags

NGSS.HS-PS2-1

What force keeps planets in orbit around the Sun?

• Friction

• Gravity

• Momentum

• Velocity

Tags

NGSS.HS-ESS1-4

NGSS.HS-PS2-4

Bruno the bat flies at a speed of 0.5 m/s in circle of radius 1 m. What is his acceleration?

• 0.25 ms^-2

• 0.5 ms^-2

• 1 ms^-2

• 2 ms^-2

Tags

NGSS.HS-PS2-1

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

• It increases.

• It decreases.

• It remains unchanged.

Calculate the mass of an object if it took 20 N 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

Tags

NGSS.HS-PS2-1

What is the relationship between centripetal force and the mass of an object?

• direct

• inverse

• exponential

• inverse squared