Force

M. EVAN CENDEKIA S.VIII A021

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Force Newton’s Laws

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A force is a push or pull upon an object resulting from the object's interaction with another object

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There are two part of force 1. contact force 2. non contact force

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Contact Force

1. frictional force 2. machine force 3. muscular force 4. spring force 5. air resistance force 6. electrical force

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Non contact force

1. gravitation force 2. magnetic force

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1. Frictional Force Spring force is a force that produce from a spring, because the spring is pulled or pressed

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2. Machine Force Machine force is the force generated by a given the machine.

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3. Muscular Force

Muscular force is a force that comes from muscular power.

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4. Spring ForceSpring force is a force that produce from a spring, because the spring is pulled or pressed

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5. Air Resistance Force

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Electrical Force

Electric force is a force produced by electrical charges.

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Gravitation ForceGravitation force is the attraction force caused by the earth.

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Magnetic ForceMagnetic force is a force produced by magnets.

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Beneficial

1. Frictional Force : car can move 2. Machine Force : can produce electrical

( Diesel Engine) 3. Muscular Force : People can push the car 4. Spring Force : People can hunt with spring

force ( use arrow ) Air resistance Force : wind can play windmill that

can regenerate energy 5. Electrical force : the lamp will be light 6. Gravitational Force : reflected basketball will

not bounce too high so basketball players no trouble catching the ball

7. magnetic force : can collect nails in the street

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Harmful

1. Frictional Force : friction car with other cars

2. Machine Force : machines produce waste 3. Muscular Force : fight causes pain in the

body 4. Spring Force : people use arrow to kill

rare animal Air resistance Force : can make a tornado 5. Electrical force : can kill people 6. Gravitational Force : meteor that across the

atmosphere will pulled into earth by gravitation 7. magnetic force : tv will be chance color

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Resultan force

Several force acting on the body in one work line can be replaced by a force called force resultant

Mathematically, the magnitude of force resultant (R) is expressed as follows :

321 FFFR

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WEIGHT(berat)

Weight of a body can change depends on the magnitude of gravitational force.

Weight of the body is earth gravitational force acting on the body.

Weight of a body can change depends on the magnitude of gravitational force.

The weight unit is states with force unit, namely newton (N)

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Newton’s I law

“every body will be at rest or move in uniform rectilinear if there is no forces change that condition.”

“ if force resultant acting on the body is equal to zero, or there is no forces acting on the body, the body will be at rest ( does not move ) or will move in uniform rectilinear”

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Newton’s II Law

“The body that influence force will have acceleration which its magnitude is directly proportional to the magnitude of the sum of force and inversely proportional to its mass”

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Newton’s III law

“If a body makes force ( making action ) to another body, apears reaction force from the body to the former body with equal magnitudes, while the directions are in opposite”

21/ FFFF reaksiaksi

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Thank you

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MADE BY: M. Evan Cendekia s.