Circular Motion Review

How does the gravitational force the Earth exerts on the sun compare to the gravitational force the sun exerts on the Earth?

• The gravitational force the sun exerts on the Earth is larger

• The gravitational force the Earth exerts on the sun is larger

• Their gravitational forces are equal

• There is not enough information

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NGSS.HS-PS2-4

As two objects get closer together, what happens to the force of gravity between them?

• The force of gravity increases

• The force of gravity decreases

• The force of gravity stays the same, since their masses are constant

• Not enough information

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NGSS.HS-PS2-4

As an astronaut travels far away from Earth, his weight

• increases because gravity increases.

• decreases because her mass decreases.

• remains the same because her mass remains the same.

• decreases because gravity decreases.

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NGSS.HS-PS2-4

How does the force of gravity between two objects change when the mass of one of the objects increases?

• Fg increases

• Fg decreases

• It depends on the distance between the objects

• Fg stays the same

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NGSS.HS-PS2-4

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

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

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

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NGSS.HS-PS2-4

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

A ball on a string is travelling in circular motion. Which vector represents the centripetal force?

• The green vector because it points towards the center of the circular path
• The blue vector because it shows the direction of the object's inertia
• The green vector because it shows the path of the ball
• The blue vector because this is the way the ball will move when it is released.

Tags

NGSS.HS-PS2-1

Calculate the centripetal force required to make a 5 kg ball move 4 m/s in a circle with a radius of 2 m.

• 10 N
• 20 N
• 30 N
• 40  N

Tags

NGSS.HS-PS2-1