Answers 2003390-Physics 1 Honors Sem. 1 - PetersCircular Motion

Circular Motion Answers

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A remote-controlled plane has a mass of 0.386 kg and flies in a circle with a radius of 75 m. The centripetal force on the plane is 4.0 N.

11 m/s

28 m/s

45 m/s

784 m/s

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Lucia wants to change the motion map shown so that it shows uniform circular motion.

She should change the length of each vector that is tangent to the circle so that it is the same as the vector pointing toward the center at that point.

She should change the direction of the vectors that are toward the center of the circle so that each points tangent to the circle opposite the existing tangent vectors.

She should change the direction of the vectors that are toward the center of the circle so that each points away from the center of the circle.

She should change the lengths of the vectors that point toward the center so that each is the same length.

An object is in circular motion. How will the object behave if the centripetal force is removed?

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.

Scientists are making plans to put a probe in orbit around Earth. They want the probe to enter the orbit shown below.

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

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

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

A centripetal force causes circular motion because it accelerates an object

toward the center of a circle, which changes the direction of motion but not the speed.

toward the center of a circle, which changes the speed of motion but not the direction.

along the edge of a circle, which changes the direction of motion but not the speed.

along the edge of a circle, which changes the speed of motion but not the direction.

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

What is the direction of the centripetal force when applied to an object?

the direction opposite to the object’s velocity

the same direction as the object’s velocity

perpendicular to an object’s motion

parallel with an object’s motion

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Circular Motion Answers

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