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Caroline Cummings (1st) and Annalis Mach (0 hr)

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Caroline Cummings (1st) and Annalis Mach (0 hr)

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The acrobat is suspended high in the air, so she has high potential energy. As her height increases, her position relative to the ground is higher, thererfore she has higher potential energy. In this case, she has high gravitational potential energy because she hanging high off of the ground.

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The hand is causing a force that is making the lasso move in a circle. The change in the position of the hand indicates a change in tangential velocity because the direction of every point on the lasso is changing. Also, the direction of acceleration is pointed in towards the center of the circle.

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For an object to be in free fall the only force acting on that object can be the force of gravity. In this picture the child is jumping into the pool, so while in the air he is experiencing free fall.

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The hand is doing work on the car because it is applying a force to the car that is changing the total energy of the car system. It is applying the force for a certain amount of time, causing the car to be displaced from its original position, and thus does work on the car.

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The dancer is jumping up in the air. The direction of its motion is pointed up, but the acceleration vector is pointed down. The acceleration is pointed down because the only force acting on the dancer is the force due to gravity, and the vector of the acceleration due to gravity is pointed down, to earth. Since the acceleration vector is in the opposite direction of the dancer's motion, the dancer is exhibiting negative acceleration. The dancer slows down as she ascends due to the gravity acting in the opposite direction of the motion.

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According to Newtons first law, an object at rest will continue at rest until an outside force does work on the object. In this example, the book is at rest and will continue to remain at rest until some force is exhibited on the book.

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This truck is exhibiting positive acceleration because the direction vector is in the same direction of the truck's motion. Since the truck is speeding up and moving left (shown by the truck speeding up to not sink in the sand), the acceleration is positive.

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In this photo the bull rider will feel the impulse as the bull's hoofs hit the ground. Impulse is mass times the change in velocity, and is the change in momentum. The momentum of the system is changing because the velocity of the system is changing. The velocity of the system is changing because when the bull jumps and runs in the pen, its velocity changes each time is speeds up, slows down, or changes direction.

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In this photo the guitar strings exhibit harmonic motion because the stringers are a medium that transfer energy. When the strings are plucked, standing waves are created, which are an example of harmonic motion.

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The skier on this mountain is exhibiting high kinetic energy because he is converting all his potential energy to kinetic energy as he skis down the hill. He has high kinetic energy because he initially started with only potential energy and now as he skis down the slope that is all converted into kinetic energy. As the skier continues to convert his remaining potential energy into kinetic energy he will gain speed (mgh = mgh + 1/2mv^2). This equation applies because energy will be conserved because the snow has negligble friction.