Chapter 5: Circular Motion and Gravitation

Centripetal force, created by swinging something in a circle, acts in a direction--

• along the path of motion

• away from the center of the circle

• toward the center of the circle

• tangent to the circle

A 10kg car travels at a constant speed of 20.0 m/s around a horizontal circular track. Which diagram correctly represent the direction of the car's velocity (v) and the direction of the centripetal force (Fc) acting on the car at a particular moment?

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Tags

NGSS.HS-PS2-1

Two objects are attracted to each other with 36 N of gravitational force.
What would the force between them be if one of the masses were doubled?

• 9
• 18
• 72
• 144

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NGSS.HS-PS2-4

A race car completes three laps of a circular track with a radius of 35 m in 9.0 seconds. Determine the speed of the car.

• 3.9 m/s

• 73.3 m/s

• 24.4 m/s

• 1.0 m/s

Two masses 8000 kg and 1500 kg are 1.5 m apart. Find their gravitational pull.

• 3 N

• 0.0003 N

• 3000 N

• 30 N

Tags

NGSS.HS-PS2-4

Which represents the speed of the bowling ball?

• A

• B

• C

• D

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NGSS.MS-PS3-1

A 2.8 x 10³ kg truck is travelling through a highway curve that has a radius of 170 m. If the coefficient of friction between the highway and the truck’s tires is 0.45, what is the maximum speed, in km/h, that the truck can go before sliding off of the road?

• 27 km/h

• 58 km/h

• 99 km/h

• 2.1 x 10² km/h

Tags

NGSS.HS-PS2-1

A car traveling at 20 m/s rounds an 80-m radius horizontal curve with the tires on the verge of slipping. Assuming the same coefficient of friction between the car’s tires and each road surface, the same car can round a second curve of radius of 320 m with a speed, to the nearest whole number, of ____ m/s.

Tags

NGSS.HS-PS2-1

A 600 g rock is tied to a string and whirled in a vertical circle with 80 cm radius. The frequency of rotation is 5.4 Hz. What is the tension in the string at the top of the circle? Round your answer to the nearest newton. Do not include units in your typed answer.

Tags

NGSS.HS-PS2-1

A 600 g rock is tied to a string and whirled in a vertical circle with an 80 cm radius. The frequency of rotation is 5.4 Hz. What is the tension in the string at the bottom of the circle? Round your answer to the nearest newton. Do not include units in your typed answer.

Tags

NGSS.HS-PS2-1