![]() It refers to the force applied either by a person to an object or by an object to another object. The high viscosity of a substance indicates its high resistance.Į.g., Water moving against the body of a swimmer. It acts against the natural flow of the substance like a hurdle. The resistance between two such surfaces gives rise to fluid friction. This is only between liquid/gaseous surfaces and strictly does not involve any solids. Sliding Friction- only one side of the object is in contact.Rolling Friction- force resists the rolling motion.Į.g., Rolling of a basketball on the ground. ![]() Kinetic Friction- both solid surfaces are not in motion.Static Friction – both solid surfaces are in motion.This is only between solid surfaces and strictly does not involve any liquids or gases.ĭepending upon the varying solid surfaces that exist, it is again divided into four types. It is further classified into two types based on solid and liquid/gaseous surfaces – Position from which force it is applied.Movement of pen nip against the paper while writing.įactors that may or may not affect friction are – This type of force causes motion through contact, either directly or indirectly.Įxamples: Motion of wheels on the road of a car while driving. Since force has magnitude and direction, based on these, it is divided into two types – Change its direction with respect to the speed and shape/size of the object.Stop the motion of an already moving object.Increase or decrease the speed of an already moving object.(ii) Directional change – continues in the same route as the original or a different path.Ĭhanges in speed and direction contribute to the following results – Units: SI (Standard International) system – Newton (N)Ĭgs (Centimetre Gram Second) system – kg.m/s 2 or dyne Now, based on magnitude and direction, the force causes two things Therefore, force can also be expressed as: Magnitude is the amount of force applied while It is a vector product, as it has both magnitude and direction.Įxamples: Electric force, Nuclear force, Spring force, etc. What is Force?Īn invisible action leading to the motion of an object to a new position from its original position is called Force. Do be careful not to fall over though.In this science guide, kids can learn all about force and motion and the relationship between them. The rougher the surface the more friction is produced, this is why rockets are streamlined! Friction Experimentsįind out why you slip and slide more on smooth surfaces than rougher surfaces with this slipping and sliding activity. The amount of friction between two objects depends on what the objects are made from. ![]() There is more friction between the velcro strips than the ribbon. Imagine sliding two strips of ribbon over each other and then think how hard it would be with two velcro strips. Friction allows things to start and stop moving and slows them down. ![]() Friction Experiments for Kids What is Friction?įriction tries to stop objects sliding past each other. Learn about simple push and pull forces in this easy activity. Over the years we’ve completed lots of forces experiments on Science Sparks, here are the best ones. Other examples of forces are magnetism, gravity and air pressure. Try rubbing your hands together? Do they get hot? You feel the friction between your hands as heat.Īir resistance and friction take time to slow an object down, if you want an object to stop quickly you need to apply further force, for example a brake on a bike. The reason it slows down is because of two forces, air resistance and friction.Īir resistance is air pushing on a moving object which slows it down.įriction is the force between two objects when you rub them together. If you give a toy car a push what happens? It speeds up and then slows down. For example you could push an empty box easily, but a filled box would be harder, it would need more force to move. Forces can also make objects change direction or shape.Ī lighter object needs less force to move than a heavier object. ![]() If you push a toy car it moves, if you push it harder it moves faster. Forces can make object moves or stop, speed them up or slow them down. Forces and Motion – What is a force?Ī force is a push or a pull. ![]()
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