Q5.3 Don’t slam on the brakes, but gradually increase pressure to keep the car from skidding with the
wheels locked. (This is especially important on wet roads.) With no relative sliding motion between
rubber and road, static friction can stop the car, instead of weaker kinetic friction.
Q5.4 The car exerts the same force as twenty people. (This is twice as much as ten people on each end.)
Q5.17 The thesis is false. The moment of decay of a radioactive atomic nucleus (for example) cannot be
predicted. Quantum mechanics implies that the future is indeterminate. On the other hand, our sense
of free will, of being able to make choices for ourselves that can appear to be random, may be an
illusion. It may have nothing to do with the subatomic randomness described by quantum mechanics.
Problems
