Gravitation and Circular Motion

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

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

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Period (T) is measured in cycles per second

• True
• False

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What is the force that causes centripetal acceleration when a car goes around a curve?

• Friction
• Gravity 
• Normal
• Tension

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At the top of a roller-coaster loop, gravity and the normal force point in opposite directions.

• True
• False

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Who created the Universal Law of Gravitation?

• Copernicus
• Newton
• Kepler
• Galileo

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Any object with mass is surrounded by a gravitational field.

• True
• False
• Inconceivable
• Star Wars!

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The gravitational force between two bodies is proportional to the product of their masses, and inversely proportional to the cube of the distance between them

• True
• False
• Whatever
• Possibly...

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Friction acts in a direction_______ to the direction of an object's motion.

• unrelated
• equal
• opposite
• perpendicular

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If you went to the moon, would your weight change?

• Yes
• No
• Maybe

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