A vintage streetcar rounds a corner on level (i.e., no banking or superelevation

Question

A vintage streetcar rounds a corner on level (i.e., no banking or superelevation) tracks. The radius of the tracks is 30 ft, and the streetcar's speed is 10 mph. There are loosely-hanging hand straps inside the streetcar, such that standing riders can hold onto them while the streetcar is in motion. Which of the following describes how one of the unused straps will hang as the streetcar makes the turn? a. Directly vertical b. Leaning toward the inside of the turn c. Leaning toward the outside of the turn d. Unknown: the length of the strap is needed A driver is attempting to an accelerate a motor vehicle from a stop on a rough road. Which of the following must the driver overcome, to accelerate the vehicle into motion? a. Kinetic friction only b. Static friction only c. Kinetic friction + static friction d. Static friction - kinetic friction

Explanation / Answer

3) leaning towards the outside of the turn. because it will be opposite in direction of motion. like when bus starts we go back or when brakes we move forwards.

4) Static friction only, because static friction always more than kinetic friction and stops the car till its extreme point.

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