A 1400 kg car, starting from rest, accelerates to a speed of 30 mph in 10 s. (a) What is the force on the car (assumed constant) during this time period? (b) Where does this force come from, that is, what is the (external) object that exerts this force on the car and what is the nature of this force? is responsible for providing the energy necessary to turn the wheels, but without an interaction with the external environment, there would be no motion). (c) Draw a free-body diagram for the car. Indicate the direction of motion and the direction of acceleration.
A 1400 kg car, starting from rest, accelerates to a speed of 30 mph in 10 s. (a) What is the force on the car (assumed constant) during this time period? (b) Where does this force come from, that is, what is the (external) object that exerts this force on the car and what is the nature of this force?
is responsible for providing the energy necessary to turn the wheels, but without an interaction with the external environment, there would be no motion). (c) Draw a free-body diagram for the car. Indicate the direction of motion and the direction of acceleration. Now suppose that the driver, traveling at 30 mph, sees a red light ahead and pushes the brake pedal. Assume that the coefficient of static friction between the tires and the road is µe = 0, 7, and that the wheels do not "lock up," that is, they continue to roll without slipping on the road as the speed
decreases. (d) Draw a free-body diagram of the car and (e) determine the minimum stopping distance of the car? Again, indicate the direction of motion, and the direction of acceleration. Now suppose the driver wants to
again to stop as in (d), but he applies the brakes too hard, so that the wheels lock, Moreover, the road is wet and the coefficient of kinetic friction is only µc = 0, 2. the car now travels before it stops?
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