1. Chapter 7: Work and Energy (Ewen et al. 2005) Objectives: Related kinetic and potential energy to the law of conservation of mechanical energy. Related kinetic and potential energy to the law of conservation of mechanical energy. Use conservation of energy to solve problems. Use conservation of energy to solve problems.

2.  KE and PE are related to the law of conservation of mechanical energy.  Law of conservation of mechanical energy – the sum of the KE and PE in a system is constant if no resistant forces do work.

6.  A pile driver falls freely from a height of 3.50 m above a pile. What is the velocity when it hits the pile?

7.  You accidentally drop a 5.000 kg mass from a hot air balloon 400.0 m ab0ve the ground. Find its KE, GPE and ME before it is dropped AND 5.00 s after it is dropped. (Assume no air resistance.)