Quiz 1 This is a photograph of an apple and feather free fall in a evacuated chamber. The apple and feather are released from the top. Suppose the camera opened flash every 1 s.
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This is a photograph of an apple and feather free fall in a evacuated chamber. The apple and feather are released from the top. Suppose the camera opened flash every 1 s.
Suppose A1 is the distance from t = 0s to t = 1 s, A2 is the distance from t = 1s to t =2s, A3 is the distance from t = 2s to t = 3s ……
what is the ratio of A1: A2: A3…….
(2) If camera opened flash every 0.06s, is the ratio of the distance between every 0.06 s the same as above or change? Why?
(1) A simple method of measuring the static coefficients of friction: Suppose a block is placed on a rough surface inclined relative to the horizontal as show in the Fig. The incline angle is increased until the block stars
to move. Measuring the critical angle θc at which this slipping just occurs, you can obtain μsProof: μs=tan θc
(2) The 10.2 Kg block is held in place by massless rope passing over two massless, frictionless pulleys. Find the tensions T1, T2, T3, T4, T5 and magnitude of force F.
When the incline angle is increased until the block
Is on the verge of slipping, the force of static
Friction has reached its maximum value
The angle in this situation is the critical angle θc, in that situation, fsmax = μs N= μs mgcosθc = mg sinθc
Solve the above equations, μs N= μs mgcosθc = mg sinθc
- μs=tan θc