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JEOPARDY!

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JEOPARDY!

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Unit 5 Exam – Physics

Circular & Harmonic Motion

JEOPARDY!

Definitions

Labs

Demos/ Activities

Circular Motion

Harmonic Motion

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Define: Centripetal Acceleration

Any object moving in a circular path has an acceleration pointing toward the center of the circle.

Define: Period

The amount of time it takes for an object to travel one revolution or cycle.

What is the equation for the Law of Universal Gravitation and who derived it?

Newton

During uniform circular motion, what two things need to remain constant?

Speed and Radius

Define: Weightlessness

A sensation someone experiences when they are in free-fall—when there are no contact forces acting upon them.

How did we change the acceleration that the egg experienced into “g’s”?

Divide by the acceleration due to gravity—9.8 m/s/s.

For the Pendulum Lab, what did we graph in order to calculate the acceleration due to gravity?

Squared Period vs. Length

In the Simple Harmonic Motion – Springs Lab, we discovered that the period of a spring in simple harmonic motion depends only on what two things?

Mass and Spring Constant

In the Hooke’s Law Lab, we graphed Spring Force vs. Displacement. What was the slope of the line?

The Spring Constant

During the airplane lab you measured the length of the string and the radius of the circle. Why did you need both of these distances?

You needed the length of the spring and the radius in order to calculate the angle that the string was making with the vertical. This angle was then used to help calculate the centripetal force.

In order to transfer the marble from the Styrofoam cup into the paper cup, you had to spin the marble in a relatively fast circle around the inside of the Styrofoam cup. This circular motion created a force on the marble that pointed in which direction?

Toward the center of the cup

When we swung a water cup on a platform in a circle over our heads, the cup didn’t fall off the platform and the water didn’t spill, even though the centripetal force points toward the center. Why?

Inertia wants the cup to fly off in a direction tangent to the circular path, but the platform keeps getting in the way.

The spinning CDs worked based primarily on two physics principles. Which two principles?

Centripetal force and inertia

When we dropped the wine glass, the centripetal force had to be greater than the force of _____ in order for the glass to survive.

Gravity (or weight of the glass)

The ball and cup toy uses centripetal acceleration to cause the ball to travel in a circular path. What force causes the centripetal acceleration?

Tension in the string

An object moving in circular motion travels a distance of ______ in one period.

Circumference 2r

There is always a centripetal acceleration during uniform circular motion because the _______ is always changing.

Velocity (the direction of the velocity vector is always changing)

Daily Double!!!

Use the circle provided to draw in the velocity vector and the acceleration vector for an object traveling in a clockwise circle. What is the angle between these vectors?

ac

v

90 degrees

“Centrifugal Force” is really a fictitious force. People feel a sensation of being pressed outward when traveling in a circle because of which physics principle?

Inertia. For example, on a circular fair ride the person wants to travel in a straight line (due to inertia) but the ride keeps turning and getting in the way.

Where on the Earth would a person experience the least circular velocity?

North or South Pole; the radius here is zero.

What is the equation that relates Frequency to Period?

What is the equilibrium position of a spring?

The position that the spring naturally returns to when there are forces acting on it.

Define: Spring Constant

A measure of the elasticity of a spring; how difficult it is to stretch or compress a spring.

The period of a pendulum depends only on what two things?

String length and acceleration due to gravity

How do you measure the period of a pendulum or an oscillating spring?

In order to measure one full cycle, you must time from one amplitude maximum to the next. For example, the left-most position of the pendulum back to the left-most position of the pendulum. Or the top of the oscillating spring back to the top of the oscillating spring.

Question 6-100

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Question 6-200

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Question 6-300

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Question 6-400

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Question 6-500

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