JEOPARDY Click Once to Begin Unit 4 Review
JEOPARDY! Click Once to Begin 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 100 100 100 200 200 200 300 300 300 400 400 400 500 500 500 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
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? Template by Modified by Bill Arcuri, WCSD Chad Vance, CCISD
ac 90 degrees v 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 Template by Modified by Bill Arcuri, WCSD Chad Vance, CCISD
Template by Modified by Bill Arcuri, WCSD Chad Vance, CCISD
Template by Modified by Bill Arcuri, WCSD Chad Vance, CCISD
Template by Modified by Bill Arcuri, WCSD Chad Vance, CCISD
Template by Modified by Bill Arcuri, WCSD Chad Vance, CCISD
Template by Modified by Bill Arcuri, WCSD Chad Vance, CCISD
Template by Modified by Bill Arcuri, WCSD Chad Vance, CCISD
Template by Modified by Bill Arcuri, WCSD Chad Vance, CCISD
Template by Modified by Bill Arcuri, WCSD Chad Vance, CCISD
Template by Modified by Bill Arcuri, WCSD Chad Vance, CCISD
Template by Modified by Bill Arcuri, WCSD Chad Vance, CCISD
Question 6 -100 Template by Modified by Bill Arcuri, WCSD Chad Vance, CCISD
Answer Template by Modified by Bill Arcuri, WCSD Chad Vance, CCISD
Question 6 -200 Template by Modified by Bill Arcuri, WCSD Chad Vance, CCISD
Answer Template by Modified by Bill Arcuri, WCSD Chad Vance, CCISD
Question 6 -300 Template by Modified by Bill Arcuri, WCSD Chad Vance, CCISD
Answer Template by Modified by Bill Arcuri, WCSD Chad Vance, CCISD
Question 6 -400 Template by Modified by Bill Arcuri, WCSD Chad Vance, CCISD
Answer Template by Modified by Bill Arcuri, WCSD Chad Vance, CCISD
Question 6 -500 Template by Modified by Bill Arcuri, WCSD Chad Vance, CCISD
Answer Template by Modified by Bill Arcuri, WCSD Chad Vance, CCISD
- Slides: 62