Join
Topic

Force

Estimated reading: 3 minutes 497 views Contributors

Introduction to Force

Force is a push or a pull. Force is therefore that which changes a body’s state of motion or shape.
The SI unit for force is Newton (N). It is a vector quantity.

Types of Forces

1. Gravitational force – this is the force of attraction between two bodies of given masses.
– Earth’s gravitational force is the force which pulls a body towards its center. This pull of gravity is called weight.
2. Force of friction – this is a force which opposes the relative motion of two surfaces in contact with each other. Friction in fluids is known as viscosity.
3. Tension force – this is the pull or compression of a string or spring at both its ends.
4. Upthrust force – this is the upward force acting on an object immersed in a fluid.
5. Cohesive and adhesive forces – cohesive is the force of attraction of molecules of the same kind while adhesive is the force of attraction of molecules of different kinds.
6. Magnetic force – this is a force which causes attraction or repulsion in a magnet.
7. Electrostatic force – this is the force of attraction or repulsion of static charges.
8. Centripetal force – this is a force which constrains a body to move in a circular orbit or path.
9. Surface tension – this is the force which causes the surface of a liquid to behave like a stretched skin. This force is cohesive.

Factors affecting surface tension

a) Impurities – they reduce the surface tension of a liquid i.e. addition of detergent.
b) Temperature – rise in temperature reduces tension by weakening intermolecular forces.

Mass and weight

Mass is the amount of matter contained in a substance while weight is the pull of gravity on an object.
The SI unit for mass is the Kg while weight is the newton (N). Mass is constant regardless of place while weight changes with place.
Weight = Mass x g, where g is the gravitational force

Differences Between Mass and Weight Mass

1. Mass

It is the quantity of matter in a body
It is measured in kilograms
It is the same everywhere
It is measured using a beam balance
Has magnitude only Weight

2. Weight

It is the pull of gravity on a body
It is measured in Newtons
It changes from place to place
Measured using a spring balance
Has both magnitude and direction

Measuring Force

A spring balance is the most common tool for measuring force.

The length of a spring is 16.0 cm. its length becomes 20.0 cm when supporting a weight of 5.0 N. Calculate the length of the spring when supporting a weight of 6.0 N.

Solution
5N stretches to a length of (20.0 – 16.0) = 4cm
hence 1N = 4 ÷ 5 = 0.8 cm
Therefore, 6.0 x 0.8 = 4.8cm
Overall length will be: 16.0 + 4.8 = 20.8cm
= 20.8

Vector and Scalar Quantities

A scalar quantity is a quantity which has magnitude (size) only . Examples are distance, mass, speed

A vector quantity is a quantity which has both magnitude and direction. Examples are displacement, weight, velocity

Force - PreviousMeasurementNext - ForcePressure

Related articles

Leave a Comment


Share this Doc

Force

Or copy link

CONTENTS

Made with ❤️ by Darasa Huru

Learning BaseContact

Thrive! English Standard Four PDF-Free Download

Do you want to see your primary school student express themselves with absolute

Excel Now! Hisabati Darasa La Tatu PDF [Download Bure]

Je, unatafuta njia rahisi ya kumsaidia mwanafunzi wako kufanya vizuri na kupenda

Thrive! Civic and Moral Standard Three PDF [Free Download]

Looking for the official TIE Civic and Moral Standard Three textbook? Access thi

Thrive! English Standard Three PDF-Free Download

Looking for the official TIE English Standard Three textbook? Grab this free dig

Learn with Joy: Social Studies Standard Three PDF Free

Need the official TIE Social Studies Standard Three textbook? Get the free digit

Ignite Curiosity! Download the Official Standard 3 Science Technology Book Free

Looking for the official TIE Science and Technology Standard Three textbook? Gra

Master Mathematics Standard Three Textbook PDF [Free Download]

Need the Mathematics Standard Three textbook? This free PDF follows the Tanzania

English Standard Five

Are you looking for the English Standard Five textbook for primary schools in Ta

Standard Seven

Excel! Social Studies Standard Four PDF [Free Download]

Need the Social Studies Standard Four textbook? This free PDF follows the Tanzan

Thrive! Civic and Moral Education Standard Four PDF Free

Download Civic and Moral Education Standard Four book PDF. Covers TIE syllabus t

Standard Six

Chat Icon Close Icon

Subscribe

×
Cancel