- A force is any influence that causes an object to change its motion, either by starting to move, changing speed, or changing direction. The newton is the SI unit used to measure force. - Electrostatic force results from stationary or slow-moving electrical charges and holds together electromagnetic fields created by particles like electrons and protons. - Friction is a force that opposes the relative motion between two objects in contact. It allows us to walk, sit, climb stairs, and use devices that require movement.

1. Physics (Forces)
Credits to Elgin Low, Marcus Au,
Chua Zong Wei, Tam Wai Hang

2. Force
-A push or pull
Definition from Wikipedia
a force is any influence that causes a free body to
undergo an acceleration. Force can also be
described by intuitive concepts such as a push or
pull that can cause an object with mass to change
its velocity (which includes to begin moving from
a state of rest, i.e., to accelerate, or which can
cause a flexible object to deform.
This Definition has been chosen because it is much easier to understand and suits the context as compared to Dictionary.com

3. SI unit of forces
The newton is the unit used to represent
force that is derived in the SI system; it is
equal to the amount of force required
to accelerate an object of mass 1
kilogram at a rate of one meter per
second.

4. Electrostatic Force
Electrostatic force is the phenomenon that results
from slow-moving or stationary electrical charges.
It is studied in the scientific discipline known
as electrostatics.

5. Specifically, electrostatic force is the physical reaction
that holds together the electromagnetic field created
by sub-atomic particles, such as electrons and
protons. In order for electrostatic forces to remain
cohesive, these particles need to independently
maintain both positive and negative charges and
react to each other accordingly. According to the laws
of physics, there are four primary forces that describe
the reactions of particles, one of which is
considered electromagnetic force, which results
in electrostatic force under certain conditions.

6. Friction (including air resistance)
No matter which direction something moves in, friction
pulls it the other way. Move something left, friction pulls
right. Move something up, friction pulls it down.
Friction is actually a force that appears whenever two
things have contact with each other. Although two
objects might look smooth, microscopically, they're very
rough and jagged.

7. Friction (including air resistance)
Friction has a lot to do with life as we know it
here on Earth. Without it, we wouldn't be able to
walk, sit in a chair, climb stairs, or use a mouse
to surf the web. Everything would just keep
slipping and falling all over the place.

8. Gravitational force
• Gravity is a force that acts on all matter that has
mass.
• Any object that has mass will have gravitational
force and will attract other matters.
• The Earth will not be attracted to any other matter
because it has a larger mass than anything on it.

9. Gravitational force
There are three laws from Newton:
First law:
I. Every object in a state of
uniform motion tends to
remain in that state of motion
unless an external force is
applied to it. Third Law:
Second law: III. For every action
II. The force applied to an there is an equal and
object is equals to its opposite reaction.
acceleration (a) multiplied by its mass (m).

10. An example of gravity acting on the jacket

11. Magnetic Force
When the charges are in motion, an extra
force acts on them. This extra force is
called the magnetic force. IT is also the
repelling or attracting force
between a magnet and a
ferromagnetic material, between a
magnet and a current-carrying
conductor, etc.

12. Tension
Basically,
-magnitude of the pulling force exerted by one to another
-opposite of compression
-In physics, tension is the magnitude of the pulling force
exerted by a string, cable, chain, or similar object on
another object. It is the opposite of compression. As
tension is the magnitude of a force, it is measured
in newtons (or sometimes pounds-force) and is always
measured parallel to the string on which it applies. There
are two basic possibilities for systems of objects held by
strings.Either acceleration is zero and the system is
therefore in equilibrium or there is acceleration and
therefore a net force is present. Note that a string is
assumed to have negligible mass.