How Do You Calculate Work and Potential Energy in Physics Problems?

  • Thread starter hassanaw
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    Grade 11
Yes, potential energy is equal to the work done by an external force to move an object from one position to another. So, in this case, the potential energy of the system before the string is released would be equal to the work done by the archer in pulling the string back 0.60m. To calculate this, we can use the equation W = Fd, where W is the work done, F is the force applied, and d is the displacement. Plugging in the given values, we get:W = (100 N)(0.60 m) = 60 JTherefore, in summary, the potential energy of the system before the string is released is 60 J.
  • #1
hassanaw
2
0
A 175 kg case must be loaded onto a truck that is 1.5m above the ground.
calculate work done

AND

An archer exerts a force of 100N as she draws the arrow back 0.60m.
what is the potential energy of the system before the string is released?
iam completely lost on these 2 questions we did this unit like a month ago, can somebody please help with full proper solutions?

thanks
tries:

w=fxd
=9.8x36
=353 Jfor question 2, i did
the Newtons =f
so = fxd
= answer

right formula?
 
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  • #2
do you know how to calculate the work done by a constant force?
 
  • #3
Start with the definition of work done. What variables are in it?
 
  • #4
w = f x d

f= m x a
force is mass times acceleration

d is displacement
 
  • #5
right, w = f x d. but be careful, if you are talking about the energy stored in the string, f needs to be the force of the string (not the person pulling it).

next, you need to know the relationship between potential energy and work.
 

Related to How Do You Calculate Work and Potential Energy in Physics Problems?

1. What is the difference between energy and work?

Energy is the ability to do work, whereas work is the transfer of energy from one object to another. In simpler terms, energy is the potential to do something, while work is the actual action being done.

2. How is energy measured in grade 11 physics?

In grade 11 physics, energy is typically measured in joules (J). Other common units include kilojoules (kJ) and megajoules (MJ).

3. Can energy be created or destroyed?

No, according to the law of conservation of energy, energy cannot be created or destroyed. It can only be transferred from one form to another.

4. What is the difference between kinetic and potential energy?

Kinetic energy is the energy an object possesses due to its motion, while potential energy is the energy an object has due to its position or state. An object can have both types of energy at the same time.

5. How is work calculated in physics?

Work is calculated by multiplying the force applied to an object by the distance the object moves in the direction of the force. The equation is W = Fd, where W is work, F is force, and d is distance.

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