1)What is the meaning of work in science?
2) what is friction?
3) Give three examples where friction is harmful.
Answers
Answer:
1)work, in physics, measure of energy transfer that occurs when an object is moved over a distance by an external force at least part of which is applied in the direction of the displacement. ... If the force is being exerted at an angle θ to the displacement, the work done is W = fd cos θ.
2)Friction is the force resisting the relative motion of solid surfaces, fluid layers, and material elements sliding against each other. There are several types of friction: Dry friction is a force that opposes the relative lateral motion of two solid surfaces in contact.
3)Producing the heart in moving parts of machines leads to wastage of energy. Forest fires are caused due to friction between branches. Noise production leads to energy loss. A lot of money goes in using techniques like greasing and oiling for preventing usual wear and tear caused due to friction.
Hope it helps you
Mark me as Brainliest
Answer:
1. work, in physics, measure of energy transfer that occurs when an object is moved over a distance by an external force at least part of which is applied in the direction of the displacement. ... If the force is being exerted at an angle θ to the displacement, the work done is W = fd cos θ.
2. Friction is the force resisting the relative motion of solid surfaces, fluid layers, and material elements sliding against each other. There are several types of friction: Dry friction is a force that opposes the relative lateral motion of two solid surfaces in contact.
3. Friction causes moving objects to stop or slow down.
...
Ans:
Opposes motion of a body hence more energy is needed to overcome the friction.
Producing the heart in moving parts of machines leads to wastage of energy.
Forest fires are caused due to friction between branches.
Noise production leads to energy loss.
please mark as brainlest ok