1. After your sports car breakdown, you start to push it to the nearest repair shop. While the car is starting to move, how does the force you exert on the car compare to the force the car exert son you? How do these forces compare when you are pushing the car along at a constant speed.
2. Suppose a gliding bird is caught in an updraft so that it ascend sat a steady rate, in this situation, which has greater magnitude; the force of gravity or the upward force of the air on the bird.