Forces

Force•A force is a push or pull on an object resulting from the object's interaction with another object.

•This push or pull results in a change of direction and/or velocity (speed).

•The normal force is the force that opposes the force of gravity, and keeps you from falling through the floor. It is perpendicular to the surface.

Types of Force

Types of Force

Gravity is a force that pulls objects downwards towards the center of the earth. It is a fundamental force.

Going down hill on skis, a bike or a skateboard is a result of gravitational force.

Types of Force Friction is the resistance

between two surfaces that are in contact with each other. 

Frictional force is what keeps this rock climber from slipping off the rock.

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Types of Force Air resistance pushes against things which are moving.

The wind you feel on your face when you ride a bike is a result of air resistance force.

Types of Force Pressure is the force that acts on a unit area of surface due to

compression of fluids.

The feeling in your ears when you dive to the bottom of a pool, fly in an airplane or drive over a mountain pass is a result of pressure force.

14,000’ 9000’ 1000’

This plastic bottle, filled with air, was sealed at 14,000’ above sea level and then taken down to 1000’ above sea level.

Types of Force Buoyant force is the force of a fluid that pushes an object up and makes

it seem to lose weight in that fluid.

The feeling of weightlessness in water is a result of buoyant force

Types of Force Tension is the force which is transmitted

through a string, rope, or wire when it is pulled tight by forces acting from each end.

Tension force is the force responsible for you winning (or losing) a game of tug-of-war.

Types of Force Spring force is the force exerted by a

compressed or stretched spring upon any object which is attached to it. An object which compresses or stretches a spring is always acted upon by a force which restores the object to its original position.

The fun you have on a trampoline or pogo stick or the soft ride on a bike with shock absorbers is a result of spring force.

Types of Force Electromagnetic Force is the force

exerted by polar charges. It is a fundamental force.

EM Force holds together atoms and molecules and gives things strength, shape and hardness to matter.

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Balanced Forces

Balanced forces act equally and opposite of each other. Objects don’t change velocity or direction because of balanced forces

Unbalanced Forces

Unbalanced forces are needed to make things change velocity and/or direction.