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In day to day we encounter many moving objects, such as a moving motor vehicle on the highway, a series of train carriages drawn by locomotip, cart-horses, windmills, waterfalls which drives the turbine, shaft-driven motor fuel energy results burning fuel. The cause of the movement of objects dikerenakan by force. In addition to moving objects is also stationary objects, such as tables and chairs which remained silent in place, machines that diangker on the floor or wall clocks that remained stationary hanging in place.

The objects will not move and remain silent if no moves him, the moving object moves from rest into that style. A vehicle is moving at a certain speed, until the intersection looks yellow to red light signaled the driver to reduce speed and stop, by reducing gas and then braked so that the car is stopped. The cause of the cessation of the vehicle is a style, that style braking.

If we throw things up at some point the object will stop certain altitude, and eventually things will go down again to the bottom, which causes it to stop and fell further down is a force, namely gravity or gravity. From the examples above we can conclude that: the style is everything because that causes the stationary object, moving, changing positions of objects into moving or stationary state of motion otherwise be silent.

Macam Macam Style
Judging from moving an object, the force consists of:
o The force of gravity;

o Style of nature;
o Style muscles;
o Style because they fuel combustion in the motor;
o Style spring
o centrifugal force

1. Tensile earth
Gravity called gravitational force that causes objects that have gravity, we suppose that objects placed on the table, then the table will receive the gravity of the object. An object is thrown upward at some point the object will merngalami change of pace, from moving quickly turns into a slow speed and gradually decrease and eventually becomes zero, at a certain height that is at zero speed of the objects will stop and go down again with the speed that the longer the greater it is. Cause perubahabn speed of an object while the last is the gravity or gravity.

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Figure 2.2 Tensile earth (gravity)

2. Natural Style
A windmill spins moving the dynamo electric or fishing boat that moves off the sea, waterfalls that drive the turbines at hydropower is an example of a force of nature.

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Figure 2.3 Natural Style

3. Style Muscle
Muscle force is the force created by the muscle, both human and animal muscle, for example:
o Opening the lock bolt using hand;
o Sawing with a handsaw;
o Interest wagon with horses;
o Forged by using a hammer hand

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Figure 2.4 Style Muscle

4. Style combustion pressure
On motor fuel, the fuel is burned in the cylinder and the pressure of the combustion gases push the piston to move with very high style, the style of the piston subsequently forwarded keporos crank which converts else is to be behind the piston motion into rotary motion.

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Figure 2.5 The force on the reciprocating engine

5. Style spring
If we press the spring or springs, then on our hands will feel the urge, or vice versa if the spring is withdrawn it would seem there are pulling back, which led to a push or pull on our hands is the spring force. Spring style widely used example is used to move the robot, vibration dampening or shock absorber to the vehicle, valve springs and the like.

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Figure 2.6 The style spring

6. The centrifugal force
A pendulum tied with a rope, then we hold the rope and turn, turn from round to round slowly quickly, we can observe that the pendulum: the pendulum at low speed is below and at high speed pendulum will spin up and the rope becomes strained, if the rope not strong, most likely the rope would break and the pendulum will be thrown. Causes of rupture of the rope and deprived pendulum dikerenakan by a force called the centrifugal force.

Centrifugal force encountered for instance in centrifugal pump, the speed control cut-out on the motor. Centrifugal force that is the style that leads out, while the force that leads into the opposite to the direction of centrifugal force is called the centripetal force.

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Figure 2.7 The centrifugal force