Phys 203

Luke Skywalker has a mass of 13 kg and weight of 127.4 N on earth. Find his weight on the Endor moon. Acceleration due to gravity of 2 m/s/s.

• 254.8 N

• 13 kg

• 26 N

• 127.4 kg

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NGSS.HS-PS2-1

NGSS.HS-PS2-4

What happens to the acceleration due to gravity as you move away from the surface of a planet?

• Increases

• Decreases

• Remains the same

• Cannot be determined

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NGSS.HS-PS2-4

What is the equation to calculate the gravitational force for an object?

• F = mT

• F = mv²/r

• F = mu mg

• F = mg

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NGSS.HS-PS2-4

Which of the following can be a centripetal force?

• friction

• tension

• gravity

• all of these

The centripetal force on an object in circular motion is

• perpendicular to the plane of the object's motion

• in the plane of the object's motion and perpendicular to the tangential speed.

• in the plane of the object's motion and in the same direction as the tangential speed

• in the plane of the object's motion and in the direction opposite the tangential speed.

A child rides a bicycle in a circular path with a radius of 3.8 m. The tangential speed of the bicycle is 4.1 m/s. The combined mass of the bicycle and the child is 46 kg. What is the magnitude of the bicycle's centripetal acceleration?

• 1.0 m/s²

• 4.4 m/s²

• 8.0 m/s²

• 15 m/s²

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NGSS.HS-PS2-1

A child rides a bicycle in a circular path with a radius of 3.8 m. The tangential speed of the bicycle is 4.1 m/s. The combined mass of the bicycle and the child is 46 kg. What is the magnitude of the centripetal force on the bicycle?

• 162 N

• 86 N

• 50 N

• 203 N

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NGSS.HS-PS2-1

A child rides a bicycle in a circular path with a radius of 3.8 m. The tangential speed of the bicycle is 4.1 m/s. The combined mass of the bicycle and the child is 46 kg. What kind of force provides the centripetal force on the bicycle?

• Gravitational force

• Air resistance

• Friction

• Normal force

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NGSS.HS-PS2-1

A ball is whirled on a string, then the string breaks. What causes the ball to move off in a straight line?

• centripetal acceleration

• centripetal force

• centrifugal force

• inertia

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NGSS.HS-PS2-1

A sock stuck to the side of a clothes-dryer barrel has a centripetal acceleration of 20 m/s². If the dryer barrel has a radius of 0.45 m, what is the tangential speed of the sock?

• 6.7 m/s

• 2.4 m/s

• 3.0 m/s

• 9.0 m/s