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eureka_beyond
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Homework Statement
the question and answers are in the attachment, I don't understand question 8b) (ii), why is the work done against friction =f x d and not 10N x d?
The obvious question is: What does the friction force equal?eureka_beyond said:why is the work done against friction =f x d and not 10N x d?
That means the 10 N force is no longer applied.eureka_beyond said:if the force ceases to act after 4 seconds,
What's the only force acting to slow down the block?what 's the further distance traveled by the block before it comes to rest?
Yes. Now use the given information to figure out the friction force. (Hint: Newton's 2nd law.)eureka_beyond said:that's got to be the friction, right?
Good!eureka_beyond said:by Newton's 2nd law
F=ma
Let the friction be f
10-f=3(2)
f=4N
Several ways:eureka_beyond said:yay! thanks a million. but there's another thing, how do I get the further distance traveled by the block before it comes to rest?
Work, energy, and power are all related concepts in physics, but they have distinct meanings. Work is defined as the force applied to an object multiplied by the distance the object moves in the direction of the force. Energy is the ability of an object to do work. Power is the rate at which work is done or energy is transferred. In other words, work is a measure of the effort put into a task, energy is the potential to do work, and power is the rate at which energy is used or transferred.
Work, energy, and power are related through the equation W = Fd, where W represents work, F represents force, and d represents distance. This equation shows that work is directly proportional to both force and distance. Energy is also related to work through the concept of potential and kinetic energy. Power is related to work and energy through the equation P = W/t, where P represents power and t represents time.
The SI (International System of Units) unit for work is the joule (J). The joule is equivalent to one newton-meter (N·m). The SI unit for energy is also the joule. The SI unit for power is the watt (W), which is equivalent to one joule per second (J/s).
Work, energy, and power can be seen in many everyday activities. For example, lifting a book off a table requires work, as you are applying a force to move the book a certain distance. The book also has potential energy due to its position above the ground, which can be converted into kinetic energy if dropped. Power can be seen when using appliances such as a blender or vacuum cleaner, where energy is being transferred at a certain rate to perform work.
The conservation of energy principle states that energy cannot be created or destroyed, only transformed from one form to another. This means that the total amount of energy in a system remains constant. When work is done on an object, energy is transferred to it, and when work is done by an object, energy is transferred away from it. Power is a measure of how quickly this energy is transferred. Therefore, the conservation of energy principle is closely related to work and power, as it explains how energy is conserved and transformed in different forms.