FRICTIONAL FORCE
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This document discusses frictional force, including that it is a force between two surfaces in contact that opposes their motion relative to each other. Frictional force always acts in the opposite direction of motion and depends on factors like the roughness and pressing force of the surfaces. The document outlines learning objectives about friction and its direction, provides examples of friction, and explains how simulations can show the effect of different surface types on friction. It also lists advantages of friction, like preventing slipping, and disadvantages, such as producing heat, wear, and noise.
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Friction
This document discusses friction and the forces involved. It defines friction as the force between two surfaces in contact that are sliding or trying to slide past one another. It describes how static and sliding friction work to either start or keep an object in motion. Examples are given of both the useful and harmful aspects of friction. Methods to increase friction like tread on tires or decrease it like lubricants are outlined. The differences between rolling and sliding friction and how rolling friction is less are explained. Finally, fluid friction is defined and how the shape of objects impacts the frictional forces when moving through fluids.
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The document defines a force as that which causes changes in speed or deformation of an object. It describes different types of forces including contact forces and forces at a distance. Gravity is defined as an attractive force between masses that decreases with increasing distance. Weight is the force of gravity on an object and is measured in Newtons. Archimedes' principle states that immersed objects experience an upward buoyant force equal to the weight of the displaced fluid. Forces such as gravity, buoyancy and weight are used to explain why objects fall, float or are in equilibrium in fluids.
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Frictional Force
Friction is the force that resists the motion of objects in contact with each other and is caused by irregularities in the surfaces in contact. The different types of friction include static, sliding, and rolling friction and are affected by factors like the type of surface and amount of force pressing the surfaces together. While friction provides advantages like allowing us to walk without slipping, it also has disadvantages as it slows movement and produces unwanted heat, requiring more energy to overcome. Methods like lubrication and using rollers can help reduce friction.
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Force is a push or pull that can be described by its strength and direction. There are two types of forces - contact forces like friction that require touching, and non-contact forces like gravity and magnetism. The net force on an object is the combination of all individual forces acting on it. Forces can be balanced or unbalanced. Common forces acting on objects include gravity, friction, and the normal force.
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Friction is the force that resists the motion of objects in contact with each other and is caused by irregularities in the surfaces in contact. The different types of friction include static, sliding, and rolling friction and are affected by factors like the type of surface and amount of force pressing the surfaces together. While friction provides advantages like allowing us to walk without slipping, it also has disadvantages as it slows movement and produces unwanted heat, requiring more energy to overcome. Methods like lubrication and using rollers can help reduce friction.
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FRICTIONAL FORCE
- 2. LEARNING OUTCOMES: At the end of this lesson, students will be able to: • Explain with examples the existance of frictional force. • State the direction of frictional force. • Carry out an experiment (simulation) to show how different types of surfaces affect frictional force. • Explain the advantages and disadvantages of friction. SH.EFFASH.EFFA
- 4. • Friction is a force between two surfaces that are sliding and they must in contact with each other. • Examples: – The tyre of the lorry is in contact with the road. SH.EFFASH.EFFA
- 5. • Friction always works in the opposite direction from the direction of the moving object. • Can slows a moving object down Moving Friction SH.EFFASH.EFFA
- 6. Friction depends on… Roughness of the surfaces Force that objects are being pressed one against the other or Weights of the objects SH.EFFASH.EFFA
- 8. Advantages of friction Prevents from slipping while walking Stops the car from moving SH.EFFASH.EFFA
- 9. Climb a tree Writing on the paper Holding s spoon and fork for eating SH.EFFASH.EFFA
- 10. Friction produces heat. Friction wears out the rubbing surfaces. Friction produces noise. Disadvantages of friction SH.EFFASH.EFFA
- 12. SH.EFFASH.EFFA