Balanced and Unbalanced Forces

Force,[object Object],Force is simply a push or a pull.,[object Object],The Newton is the unit used to express force.,[object Object],When you pull a stuck door, you are applying more force to the door.,[object Object]

Forces Act on Objects,[object Object],A force is always exerted by an object and always acts on another object.,[object Object]

Net Force,[object Object],Net force is the result from combining all the force exerted on an object.,[object Object]

Net Force,[object Object],A net force acting on a stationary object will move the object.,[object Object]

Force,[object Object],Forces come in pairs,[object Object],Forces have a magnitude and a direction,[object Object],Magnitude: 5N,[object Object],Direction: north (up),[object Object],5N, north (up),[object Object]

Balanced and Unbalanced Forces,[object Object],Forces occur in pairs and they can be either balanced or unbalanced ,[object Object]

Balanced Forces,[object Object],A stationary object will not move while the forces acting on it are balanced.,[object Object]

Balanced Forces,[object Object],Balanced forces do not cause change in motion,[object Object],They are equal in size and opposite in direction,[object Object]

Unbalanced Forces,[object Object],When the net force of an object is not zero, the forces on the object are unbalanced.,[object Object],An unbalanced force always causes a change in motion,[object Object]

Unbalanced Forces,[object Object],3 N, right – 6 N, left = 3N, left,[object Object]

Unbalanced Forces,[object Object],4 N, left – 10 N, right =,[object Object],6N, right,[object Object]

Newton’s Second Law of Motion,[object Object],Force = mass X acceleration,[object Object],F = ma,[object Object],Force and acceleration are directly proportional. The greater the force, the greater the acceleration.,[object Object],Mass and acceleration are inversely related. The greater the mass of an object the less the acceleration if the same force is applied.,[object Object]

What is friction?,[object Object],Friction is a force which opposes motion.,[object Object],Friction is an important force in our lives. We rely on friction in many ways. An athlete usually wears shoes which provide him or her with a greater friction between the shoe and the surface. We rely on friction as an important aspect of our motion. In what other ways does friction play a role in our everyday lives?,[object Object]

Air Resistance – another type of friction??,[object Object],Air resistance is a force which opposes a moving object. This can be easily seen with falling objects. When a piece of paper and a crumple piece of the same type of paper are dropped, they fall at the same rate.,[object Object],A penny and a feather dropped in air will not fall at the same rate, but a penny and feather dropped in a vacuum (no air) will.,[object Object]

What is Gravity?,[object Object],Gravity is a force of attraction between two objects.,[object Object],Law of Gravitation – any two masses exert an attractive force on each other. The amount of attraction depends upon two things: the mass of the objects and the distance between the objects.,[object Object]

Balanced and Unbalanced Forces

Balanced and Unbalanced Forces

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Balanced and Unbalanced Forces