Short Q/A Dynamics – II

Why do ice skates effortlessly slide on ice, while your shoes cause skidding?

Ice skates slide effortlessly on ice because the high pressure exerted by the skate blade melts a thin layer of ice, creating a lubricating film of water that reduces friction. Shoes, however, have a larger surface area and higher friction, causing skidding rather than smooth sliding. Related Questions: Why door knobs are fixed at the … Read more

If you drop a feather and a bowling ball from the sane height, which one will reach the terminal velocity first? Which one of them will hit the ground first?

The feather will reach terminal velocity first because it has a higher air resistance relative to its weight, which quickly balances the downward gravitational force. However, the bowling ball will hit the ground first because it experiences less air resistance and continues to accelerate for a longer time before reaching its terminal velocity. Related Questions: … Read more

Why door knobs are fixed at the edge of door? What will happen it the door knob is at the middle of the door?

Door knobs are fixed at the edge of the door to maximize the turning effect (torque) when opening or closing the door. If the knob were placed in the middle, the perpendicular distance from the pivot (hinges) would be reduced, requiring more force to operate the door. This would make opening and closing the door … Read more