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Work and Energy: Understanding the Concept of Work Done, Summaries of Physics

Physics

The concept of work in the context of science, defining it as the energy required to complete a task. It also discusses how work is calculated using the formula f x s, where f is the force applied and s is the distance moved. Three examples are provided to illustrate the calculation of work done, force applied, and distance moved.

Typology: Summaries

2020/2021

Uploaded on 11/05/2021

vinuki-wijesiriwardena
vinuki-wijesiriwardena 🇬🇧

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Work Done ( 08/09/2020)
In science, work means how much energy is needed to complete a task. When a
force causes a body to move,workis
beingdoneon the object by the force.Workis the
measure of energy transfer when a force (F) moves
an object through a distance (d). So
whenworkisdone, energy has been transferred
from one energy store to another, and so: energy
transferred =work done.
Questions
1) A box is pushed 5 m across the floor. Friction is applying a force of 60 N.
What is the work done?
W = F x S
60 x 5 = 300
Work done = 300J
2) 400 J of work is done when a box is lifted 4 m. How much force was
applied?
W = F x S
400 = F x 4
F= 400/4
F= 100N
3) 100 J of work is done when a force of 20 N is applied. How far does the box
move?
W= F x S
100 = 20 x S
S= 100/20
S= 5 m

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Work Done ( 08/09/2020) In science, work means how much energy is needed to complete a task. When a force causes a body to move, work is being done on the object by the force. Work is the measure of energy transfer when a force (F) moves an object through a distance (d). So when work is done , energy has been transferred from one energy store to another, and so: energy transferred = work done. Questions

  1. A box is pushed 5 m across the floor. Friction is applying a force of 60 N. What is the work done? W = F x S 60 x 5 = 300 Work done = 300J
  2. 400 J of work is done when a box is lifted 4 m. How much force was applied? W = F x S 400 = F x 4 F= 400/ F= 100N
  3. 100 J of work is done when a force of 20 N is applied. How far does the box move? W= F x S 100 = 20 x S S= 100/ S= 5 m