Question

1) Serious bicyclists say that if you reduce the weight of a bike, it is better to reduce it in the wheels rather than in the frame. Why would reducing weight in the wheels make it easier on the bicyclist than reducing the same amount on the frame? 2) Why is a tapered water glass with a narrow base easier to tip over than a glass with straight sides? Does it matter if the glass is full or empty? 3) Using Bernoulli’s theorem, explain how a plane can take off.

Answer 1

1. The spining of a wheel in physics is given as the angular moment L around the axis of spin, and his equation is L = I*W, where I is the inertia mass moment of the wheel and W is the angular velocity of rotation. Also, we would obtienen this movement through kinetic energy, Ec = 0.5 * I*W^2. If you reduce the mass, the inertia mass moment is going to reduce.

2. A glass tips when its center of gravity is pushed beyone the edge of its base. The answer depends on the center of gravity. For a given base, the glass is easier to tip the higher the center of gravity. For a center of gravity at a given height, the more narrow the base the easier it is to tip over. If the water lowers the center of gravity it makes it harder to tip over the glass. If the water increase the center of gravity it makes the glass easier to tip. Also, the weight of the water makes it take more force to top over the glass.