Forces What is a force n Force a

What is a force? n Force a push or pull on an object n

Unbalanced Forces n Unbalanced forces acting on an object will cause an object to

Inertia n Inertia is the tendency of an object to resist change in its

Newton's First Law n An object at rest tends to stay at rest and

Mass n Mass is the amount of matter in an object. Not it's weight.

Newton’s Second Law n The net force on an object is equal to the

Newton’s Third Law n For every action there is an equal and opposite re-action

Friction n The force that one surface exerts on another when the two surfaces

Three Kinds Of Friction n Sliding friction- solid surfaces sliding over each other.

Three Kinds Of Friction Cont. n Rolling friction-a round solid object rolling over a

Three Kinds Of Friction Cont. n Fluid friction- a solid object moving through a

Gravity n The force that pulls objects toward each other. n Free fall- when

Gravity Continued n Acceleration of objects in free fall is 9. 8 m/s². n

Weight n What is the difference between mass and weight? n Mass is the

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Forces

What is a force? n Force a push or pull on an object n Forces are described by how strong they are and the direction in which they act.

Unbalanced Forces n Unbalanced forces acting on an object will cause an object to start moving, stop or change directions.

Inertia n Inertia is the tendency of an object to resist change in its motion.

Newton's First Law n An object at rest tends to stay at rest and an object in motion tends to stay in motion unless acted upon by an unbalanced force.

Mass n Mass is the amount of matter in an object. Not it's weight. n Mass is measured in Kilograms n The greater an objects mass the greater it’s inertia.

Newton’s Second Law n The net force on an object is equal to the product of it’s acceleration and it’s mass. n force = mass x acceleration

Newton’s Third Law n For every action there is an equal and opposite re-action

Friction n The force that one surface exerts on another when the two surfaces rub against each other. n The strength of friction depends onn The types of surfaces involved n How hard the surfaces push together.

Three Kinds Of Friction n Sliding friction- solid surfaces sliding over each other.

Three Kinds Of Friction Cont. n Rolling friction-a round solid object rolling over a surface.

Three Kinds Of Friction Cont. n Fluid friction- a solid object moving through a liquid or a gas

Gravity n The force that pulls objects toward each other. n Free fall- when the only force acting on an object is gravity.

Gravity Continued n Acceleration of objects in free fall is 9. 8 m/s². n Objects falling through air experience a fluid friction called air resistance.

Weight n What is the difference between mass and weight? n Mass is the amount of matter in an object. n Weight is a measure of the force of gravity on an object. n Weight =mass X acceleration due to gravity. n In science weight is measured in Newtons.