Template by Modified by Bill Arcuri, WCSD Chad Vance, CCISD Click Once to Begin JEOPARDY! Unit 4 Review Circular Motion

Template by Modified by Bill Arcuri, WCSD Chad Vance, CCISD JEOPARDY! Definitions Demos/ Labs Torque & C of M Circular Motion Empty

Template by Modified by Bill Arcuri, WCSD Chad Vance, CCISD Daily Double Graphic and Sound Effect! DO NOT DELETE THIS SLIDE! Deleting it may cause the game links to work improperly. This slide is hidden during the game, and WILL not appear. In slide view mode, copy the above (red) graphic (click once to select; right click the border and choose “copy”). Locate the answer slide which you want to be the daily double Right-click and choose “paste”. If necessary, reposition the graphic so that it does not cover the answer text. Daily Double!!!

Template by Modified by Bill Arcuri, WCSD Chad Vance, CCISD Define: Period

Template by Modified by Bill Arcuri, WCSD Chad Vance, CCISD The amount of time it takes for an object to complete one revolution (travel in a complete circle).

Template by Modified by Bill Arcuri, WCSD Chad Vance, CCISD Define: Centripetal Force

Template by Modified by Bill Arcuri, WCSD Chad Vance, CCISD When the net force of an object points toward the center of a circular path, it is said to have a centripetal force. There must be an EXTERNAL force to create circular motion (i.e. gravity or string tension).

Template by Modified by Bill Arcuri, WCSD Chad Vance, CCISD What is the Law of Universal Gravitation and who derived it?

Template by Modified by Bill Arcuri, WCSD Chad Vance, CCISD All objects with mass experience an attractive force toward each other. Newton

Template by Modified by Bill Arcuri, WCSD Chad Vance, CCISD Define: Weightlessness

Template by Modified by Bill Arcuri, WCSD Chad Vance, CCISD A sensation someone experiences when they are in free-fall—when there are no contact forces acting upon them.

Template by Modified by Bill Arcuri, WCSD Chad Vance, CCISD What is the difference between center of mass and center of gravity?

Template by Modified by Bill Arcuri, WCSD Chad Vance, CCISD Center of mass is the point on an object where mass is equal in all directions. Center of gravity is the point on an object where the force of gravity can act without causing a rotation.

Template by Modified by Bill Arcuri, WCSD Chad Vance, CCISD When we dropped the wine glass, the centripetal force had to be greater than the force of _____ in order for the glass to survive.

Template by Modified by Bill Arcuri, WCSD Chad Vance, CCISD Force of gravity – weight of the glass

Template by Modified by Bill Arcuri, WCSD Chad Vance, CCISD In order to pick up the marble using the Styrofoam cup, you had to spin the marble in a relatively fast circle around the inside of the cup. This circular motion was caused by a force on the marble that pointed in which direction?

Template by Modified by Bill Arcuri, WCSD Chad Vance, CCISD Toward the center of the cup

Template by Modified by Bill Arcuri, WCSD Chad Vance, CCISD 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?

Template by Modified by Bill Arcuri, WCSD Chad Vance, CCISD Inertia wants the cup to fly off in a direction tangent to the circular path, but the platform keeps getting in the way.

Template by Modified by Bill Arcuri, WCSD Chad Vance, CCISD If an egg being swung in a circle experiences a centripetal acceleration of 57 m/s/s, how many g’s is the egg experiencing?

Template by Modified by Bill Arcuri, WCSD Chad Vance, CCISD 5.82 g’s

Template by Modified by Bill Arcuri, WCSD Chad Vance, CCISD In the airplane lab, the tension in the string was split into its x and y components. How did we find the y component of the tension? Why did we need to calculate the x component of the tension?

Template by Modified by Bill Arcuri, WCSD Chad Vance, CCISD The y component of the tension was equal to and opposite in direction of the weight of the airplane (so we calculated the weight). The x component of the tension was equal to the centripetal force (net force in the horizontal direction), the calculating of which was the point of the lab.

Template by Modified by Bill Arcuri, WCSD Chad Vance, CCISD In order for an object to be stable, its _______________ must be over its base.

Template by Modified by Bill Arcuri, WCSD Chad Vance, CCISD Center of Mass

Template by Modified by Bill Arcuri, WCSD Chad Vance, CCISD Why do people use leverage to help them move heavy objects? (Be specific.)

Template by Modified by Bill Arcuri, WCSD Chad Vance, CCISD Torque = radius (force perp.) The further away from the axis of rotation a person applies a force, the less that force has to be in order to move the object.

Template by Modified by Bill Arcuri, WCSD Chad Vance, CCISD What two conditions need to be met in order for an object to be in static equilibrium?

Template by Modified by Bill Arcuri, WCSD Chad Vance, CCISD The torques are balanced (net torque = 0 N m) and the forces are balanced (net force = 0 N). The object is stationary.

Template by Modified by Bill Arcuri, WCSD Chad Vance, CCISD What are two ways to increase an object’s stability?

Template by Modified by Bill Arcuri, WCSD Chad Vance, CCISD 1) Increase the size of its base 2) Lower its center of mass

Template by Modified by Bill Arcuri, WCSD Chad Vance, CCISD What is a rule that can be used to help you choose the axis of rotation for an object in static equilibrium if you are using net torque to solve for a force or a distance?

Template by Modified by Bill Arcuri, WCSD Chad Vance, CCISD Set the axis of rotation as a location of an unknown force (if the radius is zero, then there is no torque from that force at that location, and you therefore do not need to know he unknown force to solve the problem).

Template by Modified by Bill Arcuri, WCSD Chad Vance, CCISD An object moving in circular motion travels a distance of ______ in one period.

Template by Modified by Bill Arcuri, WCSD Chad Vance, CCISD Circumference  2  r

Template by Modified by Bill Arcuri, WCSD Chad Vance, CCISD There is always a centripetal acceleration during uniform circular motion because the _______ is always changing.

Template by Modified by Bill Arcuri, WCSD Chad Vance, CCISD Velocity (the direction of the velocity vector is always changing)

Template by Modified by Bill Arcuri, WCSD Chad Vance, CCISD 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? Daily Double!!!

Template by Modified by Bill Arcuri, WCSD Chad Vance, CCISD acac v 90 degrees

Template by Modified by Bill Arcuri, WCSD Chad Vance, CCISD “Centrifugal Force” is really a fictitious force. People feel a sensation of being pressed outward when traveling in a circle due to which physics principle?

Template by Modified by Bill Arcuri, WCSD Chad Vance, CCISD 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.

Template by Modified by Bill Arcuri, WCSD Chad Vance, CCISD Where on the Earth would a person experience the least circular velocity? The most circular velocity?

Template by Modified by Bill Arcuri, WCSD Chad Vance, CCISD Least  North or South Pole; the radius here is zero. Most  Equator; the radius (distance from the axis of rotation) is largest here. v = 2(pi)radius/period

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Template by Modified by Bill Arcuri, WCSD Chad Vance, CCISD Question 6-100

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Template by Modified by Bill Arcuri, WCSD Chad Vance, CCISD Question 6-200

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Template by Modified by Bill Arcuri, WCSD Chad Vance, CCISD Question 6-300

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Template by Modified by Bill Arcuri, WCSD Chad Vance, CCISD Question 6-400

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Template by Modified by Bill Arcuri, WCSD Chad Vance, CCISD Question 6-500

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