Answers DISD CR Physics 2020-2021Centripetal Acceleration

Circular Motion Answers

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Johanna makes the table below to organize her notes about centripetal forces.Which type of force should she place in the cell marked X?

tension

gravity

friction

normal

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Which motion maps show an object in uniform circular motion? Check all that apply.

A ball that has a mass of 0.25 kg spins in a circle at the end of a 1.6 m rope. The ball moves at a tangential speed of 12.2 m/s.

1.9 N

23 N

59 N

93 N

A child on a spinning playground ride is 0.36 m from the center of the ride. The centripetal force on the child is 19 N.

3.7 kg

13 kg

23 kg

79 kg

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gravity

inertia

centripetal force

centrifugal force

Without inertia, how would an object that is experiencing a centripetal force behave?

It would move in a line away from the circle’s center.

It would move in a line toward the circle’s center.

It would move in a curved, circular path.

It would move in a line tangent to the circular path.

A wrecking ball has a mass of 650 kg. It swings from a cable that is 21 m long. The centripetal force on the ball is 56 N.

1.3 m/s

1.8 m/s

46 m/s

870 m/s

How do inertia and centripetal force combine to keep an object moving in circular motion?

Centripetal force acts toward the center of the circle to overcome inertia, which acts away from the center.

Inertia acts toward the center of the circle to overcome centripetal force, which acts away from the center.

Centripetal force acts toward the center of the circle, and inertia keeps the object moving forward.

Inertia acts toward the center of the circle, and centripetal force keeps the object moving forward.

How does a centripetal force cause circular motion?

It acts at a right angle to the object’s motion and causes the object to constantly change direction.

It acts at a right angle to the object’s motion and causes the object to constantly change speed.

It acts in the direction of the object’s motion and causes the object to constantly change direction.

It acts in the direction of the object’s motion and causes the object to constantly change speed.

Suchita makes a table to identify the variables used in the equations for centripetal force.

X: tangential speedY: radius

X: radiusY: tangential speed

X: centripetal forceY: mass

X: massY: centripetal force

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