Article Diary - General Knowledge Digest

Force and Motion - How Do Force Works?

When do things move?

Things only move when a force is applied to them. Forces are pushes or pulls in a particular direction. A flag blows when the wind pushes it. A door opens when you pull it. Animals move when their feet push against the ground, their wings push against air or their fins push against the water around them.

How do forces work?

Forces work in pairs. They push or pull in opposite directions. When pairs of forces are equal they are said to be balanced. Tug-of-war teams remain still when each pulls with the same strength. A team falls when one side is stronger and the forces are unbalanced. Forces are also balanced when things move at on speed in the same direction. A rocket takes off when the force from the engine pushing it up is greater than the force of gravity pulling it down.

Why do thing stop moving?

Things slow down and stop because of an opposing force. One of these forces is friction. Friction happens when tiny bumps on two surfaces rub against each other. Rough surfaces, such as concrete, create more friction than smooth surfaces, such as glass. People use high-friction materials like rubber on shoe soles to stop people slipping when the walk.

Did you know?
Very fast cars, such as dragsters and rocket cars, need parachutes to slow them down quickly.

How do parachutes work?

A parachute slows down a person’s fall using ‘air resistance’. Air resistance happens when air molecules in front of moving objects squash together and press back against it. The wide area of an open parachute creates lots more resistance than a person could create with his or her body alone. This reduces the following speed of the body.

Attached Files
There are no attachments for this article.
Comments
There are no comments for this article. Be the first to post a comment.
Name
Email
Security Code Security Code
Related Articles RSS Feed
Pioneers in Science - Physics and Chemistry
Viewed 1881 times since Sat, Jan 16, 2010
Medical Inventions and Discoveries
Viewed 1997 times since Fri, Jan 15, 2010
Medical Terminology - Meanings of Common Medical Terms
Viewed 1606 times since Tue, Jan 12, 2010
The Brain - how does your brain work?
Viewed 639 times since Mon, Feb 8, 2010
Forces in Action - What makes things fall?
Viewed 643 times since Sat, Jan 23, 2010
Terminology - Study of terms and their use
Viewed 1902 times since Wed, Dec 30, 2009
Inventions and Discoveries
Viewed 1665 times since Fri, Jan 1, 2010
Colors - Commonly Asked Questions about Colors
Viewed 590 times since Fri, Jan 29, 2010
Light And Dark - where does light come from?
Viewed 806 times since Fri, Jan 29, 2010
Everyday Science Quiz Questions with Answers - Part 1
Viewed 1493 times since Fri, Dec 4, 2009
MENU