CXC Integrated Science exam guide: Section B: Machines



CXC Integrated Science exam guide: Machines


CXC Integrated Science Exam Guide

Section B-The Home/Workplace

General objectives of the section:

Candidates should demonstrate an understanding of:

1.

the soil and the sea as two most important outdoor working environments in the Caribbean and that they are both natural resources as well as ecosystems

2.

the relationship between humans and the environment in which they work

3.

the need for appropriate physical conditions such as ventilation and sanitation in the home and the workplace

4.
the inter-conversion and conservation of the different forms of energy;
5.

the occurrence of accidents and hazardous situations and safety measures used in their prevention.

UNIT X- MACHINES    

Specific Objectives

Students should be able to:

Explanatory notes
Suggested Practical Activities

1

Discuss the functions of simple machines;

Levers, pulleys and inclined planes with reference to the way they make work life  easier ; use as force multipliers or for convince if applications of a force; consider simple machines used in or associated with vehicles, for example, motor cars , push carts, dragline, bicycle; identify simple levers in the mammalian skeleton.

2

Demonstrate the different types of levers;

Organising load, effort and fulcrum in three different ways

Actual use or observation of the steering wheel, braking system, boom of draglines as levers, pulleys. wheel and the hydraulic press, screw.

3

*discuss methods of maintaining machines;

The motorcar, lawnmower, bicycle; factors such as rusting, corrosion, and friction

4

*discuss the principals of mechanical advantage and energy conversion; Use of the equations; mechanical advantage = load ÷ effort; energy converted= force x distance moved in the direction of the force

Use inclines planes to assist movement of objects from one level to another; * perform calculations on mechanical advantage and energy conversion with respect to simple machines;

5

Discuss factors that contribute to inefficiencies of machines  and ways of overcoming their influences.

Go to Section B: Unit XI: THE TERRESTRIAL ENVIRONMENT


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