You can use this site for additional help http://www.clockworks.com 1. You have

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You can use this site for additional help http://www.clockworks.com 1. You have a grandfather clock you have inherited. It currently is not working. a. What are three areas you should check to see if the mechanism is working properly? b. You check that the clock is working, and your push the pendulum to start the clock and hear the distinctive tick tock as it swings back and forth. Yet when you come back a half hour later, the pendulum is not moving. What reasons could you give for this and how could you fix them? c. What is Oscillation, and how can that be used to keep time? d. How are a tuning fork and a quartz stone similar? 2. You can use this site for additional help. https://youtu.be/46w99bZ3W_M a. When is sound considered music? b. How does surround sound work? c. Does it depend where you are in a room for surround sound to work? d. Why does it not matter where a sub-woofer is placed in a room? e. What is binaural sound? What album did Pink Floyd use binaural sound effects to put” The Lunatic inside your head?” Bonus cool stuff on how Binaural sound can be used to alter what you are listening to with the use of headphones. https://youtu.be/pvr3gr8BzA0 3. You can use this video to help you. https://youtu.be/mgcIivxODH0 a. How does Static Friction work in Velcro? b. How Sliding Friction work in Velcro? c. https://youtu.be/4eVIJME3JW8 in this clip, how was a wheel used to raise the obelisk? 4. You can use this video to help you https://youtu.be/yYAw79386WI a) How does a moving wheel have both translational and rotational movement? b) If you forget to put the lug nuts on a tire and the tire comes off, what does gyroscopic rotation make the tire do? c) How could a car continue to drive without that 4th wheel? d) How do some vehicles have locking hubs to engage 4 wheel drive ? 5. You can use this video to help you https://youtu.be/5ltjFEei3AI You’re a pilot for the Navy. For your airplane to be able to lift itself off the ground, it must be traveling forward with a speed of 208 km/h (130 mph). a. The force exerted by the air on the airplane causes it to accelerate down the runway. How long must the runway be for the airplane to reach its takeoff speed? b. An aircraft carrier runway is only about 100 m long. As your answer to part b indicates, this distance is not enough for the airplane to reach takeoff speed on its own. The aircraft carrier must assist the airplane by exerting an extra force on it. The aircraft carrier uses a steam-powered catapult to help push the airplane forward. How much additional force must the catapult exert on the airplane to bring the airplane to takeoff speed at the end of the 100-m runway? c. How does a helicopter fly that allows it to land in a smaller space then a jet? d. Why do aircraft carriers use more jets than helicopter? e. What is a sonic boom, and what causes it?

Explanation / Answer

1. (a) There may be certain reasons for it like
(1)Spring is not properly wound up
(2) Minute or hour hand are touching which can actually jam the motion .
(3)Sometimes the orientation of the clock on the wall is not in correct position which also lead to stop the watch.

(b) If clock stop half an hour then it may be possible that the orientation of the clock is not proper i.e the clock is leaning at different angle then what it was earlier when it is working properly.Its orientation changes the forces effect which lead to stop the watch.

(c) Oscillation is define as the back and forth motion in regular or fixed period of time.
Since it moves with fixed period therefore it can be use to keep time.

(d) Both are similar as they both work on the resonance condition.

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