Which of the following is an example of uniform circular motion?

1. a car accelerating on a straight road
2. a pendulum swinging back and forth
3. a satellite orbiting the earth at a constant altitude
4. a ball rolling down a hill

Is it possible to have an accelerated motion with a constant speed? Name such type of motion.

Name the force required for circular motion. State its direction.

Is centrifugal force a real force?