what is a force

OTHER LESSONS Wins Forces Energy Genetics reproduction Ecosystems
Asexual Reproduction
Charact' of Living Things
Elements, mixtures, comp.


Needs of Living Things
Nutrients in Food
Rock Cycle
Simple Machines
States of Matter
The Five Senses
Water Cycle

What is a force in science

What is a force?

A force can be a push or a pull. It is not something you can see or touch, but can see it in action. Forces can be measured using a device called force meter. The unit of force is called the Newton. It is represented by the symbol N. A force of 2N is smaller than 7N.

A force usually results from an interaction. The interaction can be a physical one or a non-physical one. Forces resulting from physical interaction are called 'Contact Forces' and examples include Frictional, Tension, Air Resistance, and Spring force.

A force resulting from non-physical interaction is called
'Action-at-a-distance force' and examples include gravitational, electrical or magnetic force.

Measuring forces
how is force measured

Force meters contain a spring connected to a metal hook. The spring stretches when a force is applied to the hook. The bigger the force applied, the longer the spring stretches and the bigger the reading.

A Force diagram

A force diagram is usually used to show the forces acting on an object. An arrow, with a name, length and direction is used to represent a force.

See this example below:
force diagram

In a force diagram, the longer the arrow, the bigger the force.


Explain what a force is