Bob drops a ball vertically from height h. It falls to the floor and bounces bac
ID: 1367061 • Letter: B
Question
Bob drops a ball vertically from height h. It falls to the floor and bounces back up to a height that is less than h. Briefly explain, using the concept of energy, why the final height is less than the initial height (i.e. what has happened to the "missing energy?") Consider the two identical masses shown below. The both begin at the same height h measured from the ground. Each moves from initial position to final position along its own path, shown by the arrows. Considers the work done on each mass by Earth's gravitational force. Is the work done on Mass A greater than, less than or equal to the work done on Mass B? Briefly explain. A projectile is fired from a spring-loaded launcher in the lab. It begins at a height of 1.10 meters above floor. It has an initial velocity of 6.4 m/s at an angle of 12 degrees above the horizontal. What maximum height above the floor will the projectile reach? How many seconds will it take the projectile to react floor?Explanation / Answer
q. no 3
when ball falls to the ground it strikes the ground and during collision some internal force works between ball and ground. these force does some work which is come in form of energy or deformation of ball. this is where the energy is lost and ball does not attin same height after collision. so energy is lost during collision.
q. no 4
gravitational force is conservative force so work done does not depend upon the path. work done in both the cases remain same = mgh