# JSS 1 Basic Science (1st, 2nd & 3rd Term)

## SPACE TRAVEL

MEANING OF SPACE TRAVEL The space outside the sun, earth, star is called outer space. Space travel is the travelling to the outer space beyond this earth. The space travellers are called astronaut. The earth is surrounded by a layer of air called atmosphere which can be divided into about 4 regions: Troposphere Stratosphere Lomosphere […]

## CALCULATION OF GRAVITATIONAL FORCES

CALCULATION OF WORK DONE AGAINST GRAVITY Suppose you lift an object of mass 1kg from the ground to a height of 1m, the work done in lifting the abject is calculated by using the formula Mgh Mgh = 1 x 1 x 9.8 joules (g = 9.8m 152) joule is the unit of work.

## FORCES

A force can be defined as any action that makes or tries to move, stop or alter the speed of a body in a given direction. TYPES OF FORCE There are two types of force namely: Contact force Non-contact   CONTACT FORCE These are  forces which sources are in contact with the body to which

## ENVIRONMENTAL POLLUTION

EFFECTS OF POLLUTION Environment Degradation Environment is the first casualty for increase in pollution weather in air or water. The increase in the amount of CO2 in the atmosphere leads to smog which can restrict sunlight from reaching the earth. Thus, preventing plants in the process of photosynthesis. Gases like Sulfur dioxide and nitrogen oxide

## ENVIRONMENTAL POLLUTION

Pollution occurs when pollutants contaminate the natural surroundings; which brings about changes that affect our normal lifestyles adversely. Pollution is the introduction of contaminants into the environment that cause harm or discomfort to humans or other living organisms, or that damage the environment which can come in the form of chemical substances, or energy such

## RENEWABLE ENERGY

Energy is the amount of force or power when applied can move one object from one position to another or Energy defines the capacity of a system to do work. Energy exists in everybody whether they are human beings or animals or non living things for e.g.: Jet, Light, Machines etc.   What are the

## ENERGY

Energy is the amount of force or power when applied can move one object from one position to another or Energy defines the capacity of a system to do work. Energy exists in everybody whether they are human beings or animals or non living things for e.g.: Jet, Light, Machines etc.   SOURCES OF ENERGY

## HIV/AIDS

HIV/AIDS COUNSELLING AND TESTING VCT stands for voluntary counseling and testing.  VCT is when a person chooses to undergo HIV/AIDS counseling so that they can make an informed decision about whether to be tested for HIV.  The government is encouraging all of us to come forward to be tested for HIV.  it believes that if many

## HIV/AIDS

DEFINITION OF STI /HIV/AIDS STIs means sexually transmitted infections. HIV stand for Human Immunodeficiency Virus while AIDS stands for Acquired Immune Deficiency Syndrome. HIV is the virus that causes AIDS. HIV destroys the body defence system while AIDS is the name given to the condition that occurs when HIV has weakened the body’s immune system.

## SEXUALLY TRANSMITTED INFECTIONS

Sexually Transmitted Infections (STIs), also known as Sexually Transmitted Diseases (STDs) or Venereal Diseases (VD) are diseases that are passed on from one person to another through sexual contact, and sometimes by genital contact – the infection can be passed on via vaginal intercourse, oral sex, and anal sex.   Modes of transmission use of

## IMPLICATION OF TENAGE PREGNANCY

CONSEQUENCES/IMPLICATION OF TENAGE PREGNANCY Depression may arise when a teenager is pregnant. The teen may fall into a depression while trying to handle the emotions a pregnancy creates and all of the possibly negative feedback about the pregnancy from friends and family. The fluctuating hormones that a pregnancy causes may also prompt depression. Uncertainty about

## HUMAN REPRODUCTION

Pregnancy symptoms: Top 11 early signs of pregnancy Food aversions Mood swings Abdominal bloating Frequent urination Fatigue Sore breasts Light bleeding or spotting Nausea A missed period High basal body temperature Positive home pregnancy test   GROWTH OF THE FOETUS One month pregnant; Your baby is an embryo consisting of two layers of cells from

## HUMAN REPRODUCTION

Meaning of menstruation Menstruation, also known as a period or monthly, is the regular discharge of blood and mucosal tissue from the inner lining of the uterus through the vagina. The first period usually begins between twelve and fifteen years of age, a point in time known as menarche. However, periods may occasionally start as

## REPRODUCTIVE SYSTEM

Reproductive System is a term applied to the group of plant or animal organs that are necessary for or that are accessory to the reproductive processes. Reproduction, process whereby all living organisms produce offspring. Reproduction is one of the essential functions of plants, animals, and single celled organisms, as necessary for the preservation of the