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https://en.wikipedia.org/wiki/Maglev

friction between rougher surfaces is greater and produces more heat than friction between smoother surfaces.

Forces

What is magnetic force?

Example ( Maglev train)

Attraction/repulsion

what is gravity?

Depend on mass of objects & distance between objects

Force of attraction on things that have mass.

What is Elastic Spring force?

When a elastic object is stretched/compressed it exerts a force on the object stretching/compressing it called elastic spring force.

elastic objects change shape when a force is applied on it. they return to their original shape when the force is removed

How can we reduce friction?

streamlined body shapes

Use rollers/ball bearings/wheels

Use lubricants.

How does friction affect us in our daily lives?

Negative

Makes objects move slowly

Makes things over heat

Causes wear and tear

Positive

Allows us to control movement. (vehicle Tires)

produces heat (Match)

reduces slipping and sliding (soles of shoes)

What is friction?

Produces heat

Friction opposes motion

Exist between surfaces that are rubbing against each other.

What are the different types of forces around us?

At a distance

Gravitational force

Magnetic force

In contact

Elastic Spring force

Friction

What are the effects of a force?

Change direction of an moving object.

increase/decrease speed of an object

Change size/shape of an object

Start/Stop motion of an object

Subtopic

What is a force?

Away from body(push)

Towards body(pull)

Push and pull