UCM

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

Which of the following is the unit for centripetal force?

• J

• m/s²

• kg⋅m/s

• N

Which of the following ranks the tensions in the strings from highest to lowest?

• A>C>D>B

• B>D>C>A

• B>C>A>D

• D>A>C>B

Tags

NGSS.HS-PS2-1

The time taken for one complete cycle is called the...

• Period

• Frequency

• Angular velocity

Tags

NGSS.HS-PS4-1

A stone is tied to a string and whirled in a vertical circle at a radius. Which of the following cannot be true?

• The string is most likely to break at the bottom of the circle.

• The tension force is the same everywhere in the circle

• The tension is the least when the stone is at the top of the circle.

Tags

NGSS.HS-PS2-1

A ball with a mass m is fastened to a string and is swung in a vertical circle. When the ball is at the highest point of the circle the tension in the string is:

• mg

• mg + ma

• ma -mg

• mg/ma

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-4

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

True or False: The force required to keep an object moving in a circle at constant speed is called centripetal force.

• TRUE

• FALSE