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Forces

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by

Anké Jansen van Rensburg

on 4 September 2013

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Transcript of Forces

Background photo by t.shigesa
Forces
What is a force?
Definition
Types of forces
There are different forces that act on an object at any time. These forces work together or against each other to produce the effect that is experienced or observed.
There are 6 primary effects of forces

- It can make a stationary object
start
moving
- It can prevent (
stop
) an object from moving
- It can make an object move
faster
- It can make an object move
slower
- It can
change the direction
of an object
- It can
change the shape
of an object
Effects of forces
In its most basic form a force is a
push or a pull
The forces themselves cannot be seen, but their effects can be seen. The effect (push or pull) that we see or experience is often a combination of many forces that act on an object at the same time. For this reason we need to look at different types of forces.
Some of these forces are:
- Gravity
- Bouyancy
- Friction
- Magnetic
- Electrostatic
- Air resistance
- Work (applied force = push or pull that is enforced upon the object)
When all the different forces that act on an object work against each other, the nett force (overall force) is equal to zero. This means that the forces that act on the object are in equilibrium and the object does not move.
Drawing forces
To indicate forces on a picture or diagram, scientists use arrows.


There are some important aspects to consider when drawing force arrows:
- The
length
of the arrow indicates the size of the force
- The
direction
of the arrow indicates the direction in which the force acts

The fact that force has both
magnitude
and
direction
means force is a
vector
.
Other facts about forces
- Forces are
measured in Newtons (N)
- Forces
usually act in pairs
- Forces always
act in a specific direction
Who knew?
Sir Isaac Newton
was the person who
discovered the concept of Gravity
after an apple reportedly fell on his head. Since he was the first person to discover an important force, the unit for force was named after him. Therefore we

measure force in Newtons (N).
Questions?

Life makes sense now
Full transcript