# Lesson Notes By Weeks and Term - Senior Secondary 1

Work done in a force field & energy conversion

Term: 1st Term

Week: 10

Class: Senior Secondary School 1

Age: 15 years

Duration: 40 minutes of 5 periods each

Date:

Subject:      Physics

Topic:-       Work done in a force field & energy conversion

SPECIFIC OBJECTIVES: At the end of the lesson, pupils should be able to

1. Determine the work done in Lifting a Body & Falling Bodies
2. Discuss the Conservation & Transformation of Energy
3. Explain the classes of world Energy Resources

INSTRUCTIONAL TECHNIQUES: Identification, explanation, questions and answers, demonstration, videos from source

INSTRUCTIONAL MATERIALS: Videos, loud speaker, textbook, pictures

INSTRUCTIONAL PROCEDURES

PERIOD 1-2

 PRESENTATION TEACHER’S ACTIVITY STUDENT’S ACTIVITY STEP 1 INTRODUCTION The teacher reviews the previous lesson on work, energy and power Students pay attention STEP 2 EXPLANATION He discusses how to determine the workdone in lifting a body and falling bodies. He further discusses the conservation and transformation of energy Students pay attention and participates STEP 3 DEMONSTRATION He explains the classes of world energy resources Students pay attention and participate STEP 4 NOTE TAKING The teacher writes a summarized note on the board The students copy the note in their books

NOTE

WORK DONE IN LIFTING A BODY & FALLING BODIES

The magnitude of work done in lifting a body is given by

Work = force x distance = m x g x h = mgh

Also, the work done on falling bodies is given by

Work = force x distance = m x g x h = mgh

CONSERVATION & TRANSFORMATION OF ENERGY

Energy can be converted from one form to another in a closed system. The law of conservation of energy states that energy can neither be created nor destroyed but can be converted from one form to the other.

World Energy Resources

World energy resources can be classified as

1. Renewable Energy Resources: They are energy that can be replaced as they are used e.g. solar energy, wind energy, water energy & biomass
2. Non-renewable Energy Resources: Energy that cannot be replaced after use e.g. nuclear energy, petroleum & natural gas

EVALUATION:   1. State the law of conservation of energy

1. A loaded sack of total mass 100kg falls down from the floor of a lorry 2m high. Calculate the work done by gravity on the load
1. Differentiate between renewable & non-renewable energy
2. A loaded sack of total mass 100kg falls down from the floor of a lorry 2m high. Calculate the work done by gravity on the load
1. A body of mass 0.6kg is thrown vertically upward from the ground with a speed of 20ms-1. Calculate its:

(a) potential energy at the maximum height reached;

(b) kinetic energy just before it hits the ground

CLASSWORK: As in evaluation

CONCLUSION: The teacher commends the students positively