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Forces and Motion
Forces and motion are very important. You may not know but forces are used in
everyday life for example: walking, pushing and pulling. Forces cause things to move.
Motion is simply a movement but it needs a force to move. There are two types of
forces contact force and non-contact force. Contact force is simply two interacting
objects touching for example: throwing a ball. Non-contact force is when two objects
are not touching are not touching like the moon and the earth ocean
Force
Firstly, force is just a technical word push or pull. If you push or pull on an object
you are applying a force. Secondly, forces make things move or change their motion.
There are so many types of forces here are just a few, gravity and magnetism.
Different Forces
There are two types of forces. Firstly, there is contact force. This is when two
interacting objects are physically touching, for example: throwing a ball, when you
throw a ball you use friction to push the pall out of your hands. Secondly, the next
force is at a distance force. It is when two interacting objects not touching each other
like for example: magnets and a paper clip and the moons gravity and the earth ocean.
This occurring because of the gravity and magnetism
Contact force
Contact force is when you
are needing to physically
touch another object to
allow it to move.
There are 4 types of contact forces. Firstly normal force is when nothing is
occurring, for example: a book on a table. Gravity is pulling down on the book to make
it rest. Secondly, the next contact force is applied force. This is when a push or pull
is applied to make an object move. Furthermore the third contact force is tension
force. This is applied to a cable or wire that are anchored and affects the cable or
wire at opposite ends. This causes the force to pull it equally in both directions. At
last the fourth and final contact force is spring force. It is a force that is created by
a compressed or stretched spring that can push or pull
Friction allows you to move
around without sliding. The
more friction you have the
more difficult it is to walk.
Friction
Friction is also a contact force. It occurs when objects rub against
each other it can be helpful. It allows you to walk around without
sliding. It also can be destructive. When two objects that rub wear
things away. The heavier the object the higher the friction like a
toy train and a real train. There are 4 types of friction. Firstly, static friction.
Static friction acts on unmoving objects. The word static describes a fixed or
stationary object. Once the force is greater than static friction it is no longer applied.
Secondly, sliding friction. It occurs between two objects sliding past each other, it
also slows things down. This is when bumps on the surface sticks together, they break
apart and reform in different places. To overcome sliding friction a force must be
constantly applied. Sliding friction is less than static friction {easier to move}.
Furthermore, the third type of friction is fluid friction. The force that resists motion
when fluid is involved for example: water through a hose. Finally the last type of
friction is rolling friction. This is frictional force between rolling objects and a
surface, for example: wheels on the car. This has much less friction than there is in
sliding friction. It depends on the materials of the wheel, rubber travels less further
that steel. Air resistance is a type of friction. It can slow things down
Inertia ais leaf.
when something is
and speed things up, like for example: wind blowing
Inertia
moving and has enough momentum
to keep moving. Gravity brings
things to a stop.
Inetria is not a force. It is the property of all things due to mass. The
more mass it has the more inertia it has. It makes
things harder or easier to move. Moving objects
tend to stay moving {depending on the mass}
stationary tend to stay stationary because of
inertia.
Non-contact force
This is a non-contact force because of moons
gravity it is pulling the earth ocean, this is
how tides form.
A non-contact force is a force applied between 2 objects. The first non-contact force
is magnetism. Magnets create a magnetic field. It is invisible to the human eye, it only
attracts certain types of metal and most metals are not magnetic. Magnets can attract
or pull on other magnets. They are magnetic to the North and South Pole, each and
every object in the world need to be in the magnetic field to respond to the poles.
This occurs because the earth is made out of iron and nichel which is giving magnets a
magnetic field.
Lastly, gravity. This is a force of attraction being applied between 2 objects. This is
occurring because the earth has mass greater than every object, like for example, if
you drop an acorn or a piano, it will gain velocity at the same rate. Gravity or the
gravitational force is a force of attraction, For example. Earth and the moon
Motion
Motion is acceleration. It’s how quickly things speed up and slow down. It is the
changings of the position or location of things. In order to do this it needs a force.
Velocity is like motion. If the direction charges,
the speed or velocity changes.
Important people
Sir Isaac newton was the most
Albert Einstein and Sir Isaac Newton were
very
important person to force and motion
Albert Einstein was a wellknown scientist
important people to force and motion. Albert Einstein was the
world’s most famous scientist of all times. He refined some of
Newton’s theories through the theory of relativity. Sir Isaac Newton was the
greatest English mathematician. Do you believe an apple caused all his theories, he
made his 3 laws of motion. His first law is, if something is moving it will keep moving
or if the object is at rest it will remain still. His second law of motion is, that when
force is acting on an object, it will change its speed or direction or both. His last and
final law of motion is, that for every force or action there is always an equal or
opposite reaction
After all the information on forces and motion it can be understood how forces and
motion occurs to everyday life, but most important it makes life as we know it .
By Yoel