Chapter 14 of 2363 min read

Work by constant and variable forces

Why this is asked: Work is zero whenever force stays perpendicular to displacement at every instant — centripetal force on a circling body and the upward force on someone carrying a bag horizontally both do zero work.

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Test yourself

•The kinetic energies of two similar cars A and B are 100 J and 225 J respectively. On applying brakes, car A stops after 1000 m and car B stops after 1500 m. If $F_{A}$ and $F_{B}$ are the forces applied by the brakes on cars A and B respectively, then the ratio $\frac{F _{A}}{F _{B}}$ is:

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