作者：Rehan Juniour 6 年以前
206
Forces
Forces play a crucial role in our daily lives, influencing various aspects of movement and interaction. They can be categorized into contact forces like friction and elastic spring force, and non-contact forces such as magnetic and gravitational forces.
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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
