Physics Quiz - Uniform Circular Motion

A 2.0 kg rock is moving in a 0.5 m horizontal circle every 0.25 s. Which of the following does the rock experience?

• no net force

• a centripetal acceleration

• only the acceleration of gravity

• motion due only to its inertia

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When dealing with an object in circular motion, the distance the object covers in one revolution is called the:

• circumference.

• radius.

• tangent.

• distance.

When dealing with circular motion, the time that it takes to make one revolution of the circle is called the:

• rotation.

• orbit.

• period.

• segment.

Why does an object experiencing uniform circular motion have an acceleration?

• because it ir changing speed

• because it is changing direction

• because it is moving n a straight line

• because it has mass

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An object in uniform circular motion is always moving ________________ the circle.

• away from

• toward

• parallel to

• tangent to

In uniform circular motion, which two variables point toward the center of the circle?

• the centripetal force and the acceleration

• the velocity and the mass

• the period and the mass

• the time and the radius

Neglecting air resistance, how would the horizontal acceleration and velocity of the hammer change if the thrower releases the chain?

• The horizontal acceleration and velocity of the hammer would be along the V_tang vector.

• The horizontal acceleration and velocity of the hammer would be inward toward the thrower.

• The horizontal acceleration and velocity of the hammer would be straight down by gravity.

• The horizontal acceleration and velocity of the hammer would be continue in a circle.

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A car moves with a constant speed of 17 m/s on a circular track of 200 m radius. Calculate the acceleration of the vehicle. HINT: a = V² / R

• 1.45 m/s²

• 0.76 m/s²

• 1.98 m/s²

• 2.34 m/s²

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A 250 kg motorcycle goes around a 20.0 m radius turn at 19.0 m/s. What is the centripetal force on the motorcycle? HINT: f = MV² / R

• 2396.6 N

• 4512.5 N

• 5006.8 N

• 5656.7 N

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The _______________________ supplies the centripetal force requirement for the car to move in a horizontal circle. Without it, the car would turn its wheels but would not move in a circle (as is the case on an icy surface).

• friction force

• centrifugal force

• normal force

• applied force

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