Force of gravity and Circular motion

A 12 kg object undergoes circular motion with a radius of 4 m and a speed of 18 m/s. What is the centripetal acceleration of the object?

• 1.125 m/s²

• 81 m/s²

• 4.5 m/s²

• 36 m/s²

Tags

NGSS.HS-PS2-1

As mass increases, what happens to gravitational force?

• increases
• decreases
• stays the same
• i don't know

Tags

NGSS.HS-PS2-4

The number 6.67 x 10 -11 N* m^2 / kg^2 is called the _______________.

• universal speed constant
• the speed force
• universal gravitational constant
• Earth's gravitational constant

Tags

NGSS.HS-PS2-4

The force of gravity on Jupiter is a little more than 2 times the gravitational force on Earth. If an object has a mass of 50 kg and a weight of 490 N on Earth, what would be the object's approximate mass and weight on Jupiter?

• 50 kg and 490 N
• 100 kg and 490 N
• 50 kg and 980 N
• 100 kg and 980 N

Tags

NGSS.MS-PS2-4

The diagram shows an object traveling at a constant speed in a circular path. Which labeled arrow represents the centripetal force acting on the object?

• W

• Z

• X

• Y

Tags

NGSS.HS-PS2-1

When a tetherball is whirling around the pole, the net force is directed?

• toward the top of the pole

• toward the ground

• horizontally away from the pole

• horizontally toward the pole

You are standing in a bus that makes a sharp left turn. Which of the following is true?

• you lean to the left because of centripetal force

• you lean to the right because of inertia

• you lean forward because of the net force is forward

• you lean to the right because of centrifugal force

A satellite of mass m and speed v moves in a stable, circular orbit around a planet of mass M. What is the radius of the satellite’s orbit?

• GM/mv

• Gv/mM

• GM/v²

• GmM/v

A ball attached to a string is moved at constant speed in a horizontal circular path. A target is located near the path of the ball as shown in the diagram.

At which point along the ball's path should the string be released, if the ball is to hit the target?

• (A) A

• (B) B

• (C) C

• (D) D

A racing car is moving around the circular track of radius 300 m. At the instant when the car's velocity is directed due east, its acceleration is 3 m/s² directed due south. When viewed from above, the car is moving

• (A) clockwise at 30 m/s

• B) counterclockwise at 30 m/s

• (C) clockwise at 10 m/s

• d. counterclockwise at 10 m/s