# miranda_morriis

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1. ## the phsyics in swinging

To start your swinging motion, you must push off the ground to create some type of energy you wish to increase. As you swing backwards to get a starting swing from gravity, your potential energy will increase as your body moves forward. Going backwards, your potential energy decreases and increases in kinetic energy. Whether you're increasing or decreasing in kinetic or potential energy, the increase or decrease is the same amount of either energy. So for example, the amount of kinetic energy you lose is the amount of potential energy you will obtain.
2. ## the physics in jumping on a trampoline

The equation E=KE (kinetic energy) + PE (potential energy) is used to find the energy of a jump on a trampoline. When you jump, you lose your kinetic energy due the velocity of your jump while gaining potential energy. If you jump with a greater speed and force, it will result in a larger jump. The energy you use to push down on the trampoline transfers into the reaction of the springy material to create energy to lift you high into the air.
3. ## the physics in singing

Just like the violin strings, your voice is also a vibration that travels through the air. Your auditory nerves are stimulated by vibrating air molecules. These vibrating air molecules cause other adjacent molecules to vibrate and the motion is carried through the air to your ear. This is mechanical energy creating your ear drum to vibrate, allowing you to hear the sound that was created. There are different dynamics to singing. For example forte, which means loud. This means your voice increases in the amplitude which is the loudness.
4. ## the physics in playing the violin

In order to create sound on this instrument, you must create a vibration of the strings. Whether it's plucking the strings by hand or placing a bow across the different strings. The vibration travels through the strings to the bridge and sound post at the bottom of the instrument. This allows the sound to radiate in the air. The tension in the strings, increasing the tension = a higher frequency, bow, and construction of the body all control the loudness and tonal quality of the sound. Increasing the tension of the string, known as tuning the instrument, can be done by the fine tuners located on the sound post or the pegs, located at the top of the instrument.
5. ## figure skating

Figure skating incorporates Newton's first law- an object in motion will stay in motion unless acted upon by a force. Also known as inertia, the act of gliding across the ice because the friction of the ice isn't powerful enough to prevent the skater from moving. But without the friction from the ice, it would be impossible to create motion. To start moving, the skater needs to push of the ice and also to stop themselves.
6. ## the physics of swimming

the physics in swimming contains three components; resistance, drag, and hydro-dynamics. Water is 1000 times more resistant than air. Swimmers need to maximize their strealine and reduce the surface area of the human body traveling through the water. 91% of a person's energy is lost through the drag force the water creates. Minimizing the surface area is achieved by tightening the body to resemble a torpedo. In order to reach a fast velocity, the swimsuit must be designed to be similar to the skin of a shark. Sharks are chosen because of their very fast velocity,even though their surface area is large. To decrease the surface area of a swimmer's head, they wear swim caps to cover any ways to slow them down.
7. ## the physics of competitive skiing

The goal of competitve skiing is to cross the finish line the fastest, while navigating tight turns and obstacles throughout the run. The skier, during the course, minimizes the resistance to motion in order to maximize their speed, both from air resistance and snow resistance. In minimizing their air resistance, they reduce their projected frontal area. This is showed when the skier is in a crouched position, resulting in a lower drag force. Minimizing the drag force is done by two factors; body posture and the choice of race suit. Also the mass of the skier can help lower the drag force. The more mass a skier has, the greater force of gravity acting upon the skier results in a smaller magnitude of the drag force. Here, the skier will reach a greater velocity.
8. ## Roller coasters

As a roller coaster approaches a large hill, the potential energy of the car increases. As you approach the top of the hill, this is where the potential energy reaches the maximum level. Going down the hill, while increasing your speed, the potential energy transforms into kinetic energy. At the very bottom of the hill is where the kinetic energy is at it's max. While making a loop, right before the loop the cart has kinetic energy that partly transforms into potential energy, almost equal when the cart is completely upside down. Coming down from the loop, the speed increases again, resulting into that potential energy to turn into kinetic energy once again.
9. ## the physics of sleep in zero gravity

Sleeping in space, having closed eyes in zero gravity, is a very strange experience. Usually taking a day or two to get accusmed to, is related to the extension of the spine. But when you close your eyes, many astronauts experience "those never ending fall scenario that makes up many nightmares." The astronauts in space never took long periods of time to sleep. In order to sleep in zero gravity, they must be strapped into place, touching a surface. Most people lose a large percentage of their bone mass in orbit which is similar to the bone loss issue with people lying horizontally.
10. ## the physics of football

Football exemplifies physics through Newton's three laws of motion. The action displayed on the field involves mass, velocity, acceleration, torque and more. Newton's first law states that an object at rest will stay at rest. An object in motion will stay in motion unless acted upon by an unbalanced force. The heavier the object, the more resistance it can uphold to a force. So a large linebacker is going to be a tough factor in pushing around. Torque and rotational force allows a small defensive player to tackle a bigger running back. The center of a player's mass is the key. If the player is low to the ground, their center of mass is closer to the ground, so their potential torque is small. When they tackle a player who is running, having their center of gravity farther from the ground, it is easier to push the upright player around his own axis of rotation because there is more torque.
11. ## the physics behind texting and driving

Texting and driving has always been an issue and is increasing today. People are over confident in their driving and think that it is okay to look down at their phone for only a few seconds while on the road. On average, it takes 5 seconds to send a message. At 60 mph a car travels 88 feet each second, a total of 440 feet. A lot can happen in those 5 seconds, whether it is your fault for not paying attention, or not being aware of your surroundings of all the other cars as well.
12. ## the physics in sky diving

When a skydiver falls towards earth, they encounter the force of air resistance. The speed of the skydiver, accelerating downwards, gains speed throughout the fall. The increase in speed is accompanied by the increase in air resistance. The force of air resistance counters the force of gravity. So when the skydiver increases downwards, the force of gravity also increases. Once these forces balance out, the skydiver no longer accelerates.
13. ## soccer and physics

The sport soccer can relate to physics in many ways. One way it relates is the aerodymnamics of the ball spinning in the air after having kicked it. For example, to make the ball have a curved path. The closer the air is to the center of the ball, the faster the ball moves through the air. The pressure on the ball can be reduced if the ball is rotating the same way as the airflow. Bernoulli's principle states that when speed is high, pressure is low. So when kicking the ball, one side will have more pressure than the other, creating an imbalance in the ball which makes it curve. A key thing to remember though if you're intentionally kicking the ball to curve, you must kick the ball (it's initially velocity) off-centered.