The Physics……..Newton’s Third Law of Gravity
Newton’s Third Law states that if two objects interact the force exerted on object 1 is equal in magnitude but opposite in direction to the force exerted on object 2 by object 1.
Several forces are present when two objects interact with one another. Body 1’s force on 2 is the action force and body 2’s on 1 is the reaction force. The reaction force accelerates away from the earth and the action force accelerates towards the earth. A normal force is also present which acts in both ways.
The variables present are :
- Fg – the action force (= to mg)
- Fg' - the reaction force
- n-normal force exerting away from the earth
- n'- normal force exerting towards the earth
- Fg ' = - Fg
- N=-n'
The Cheerleading and How it Relates to Physics............
The stunt pictured is a QP. The girl is standing on the guy’s single hand. Notice the normal force present that holds her in the air. In which direction are the action and reaction forces working?
THE SPORT OF GYMNASTICS AND CHEERLEADING:
A cheerleader must become an expert on the physics of rotation. When a she is thrown into the air for a fancy stunt that involves rotation of the body she has all the angular momentum from her push-off that she will get.
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- Angular momentum equals the product of mass, velocity and distance from mass to axis of rotation.
- QUESTION:How can her rate of rotation change without the help of someone giving her a little help or her pushing off on something?
- ANSWER: The angular speed increases or decreases by changing the distance between the mass and the axis of rotation. When a cheerleader performs a stunt, for example, a back tuck, she may have nothing to gain angular momentum(if she stands on the ground with velocity and position both equal to zero. But when she jumps up and tucks her mass in to decrease the distance between her body and the axis of spin. Her angular momentum is still constant because no external torque (radius X force) occurs. Cheerleaders must be in top shape athletically and gymnastics background is often required to do the rigorous routines required today.
FORCE= change in momentum/ change in time
Shandale McKay:
ReplyDeleteI really liked learning how physics works in cheerleading. It really helps seeing how the stuff we learn in class is used in different aspects of life.
I was a competitive cheerleader for 5 years, and never thought about it in this manner. Being in this class has even given me a new perspective on my own major and lets me see it in a whole new light.
ReplyDeleteI agree, it is very interesting learning that everything in life can in some way be explained with physics. I never thought about all the ways physics affects your daily life. Seeing examples like this helps make everything make more sense.
ReplyDeleteI had no idea how much physics went into cheerleading. Real life examples help difficult concepts become comprehensible
ReplyDeleteIt's cool to break down activities that you never really think of relating to physics. Interesting post!
ReplyDeleteI think the physics of cheerleading is intresting. A group in our class gave a presentation on baseball and I thought the physics of baseball was awesome!
ReplyDeleteJessice Lang
I never really thought about the importance of angular momentum in cheerleading. Thanks for an article that relates physics to sports
ReplyDeleteCheerleading has alot of physics in the sport.All the movement in the sport involves physics but then again thats why momentum and timing are very important.
ReplyDeleteKelsey Irvine:
ReplyDeleteReading this made me have to stop and think about all the activities I do and how they relate to physics. I wonder if they ever stop to apply this in terms of competition.
seems like everything we do in life is connected to physics.
ReplyDelete- Tulsi Patel
Physics class always seems to make everything look different. I can't look at most things the same anymore because I start thinking about all the forces acting on them and why they are moving like they are.
ReplyDelete-Matt Outlaw