SECTION BTHEORY QUESTIONS(1a) Define the following(a) Work:
1 answer:
Work is the amount of energy transferred
Explanation:
In physics, work is a measure of the energy transfer occurring in a process. Typically, we talk about work when energy is converted from one form into another.
For instance, work is done when a force is applied on an object. The work done on the object is given by:
where
where
F is the magnitude of the force
d is the displacement
is the angle between the direction of the force and of the displacement
We notice the following:
- No work is done when the force is perpendicular to the displacement (
)
- The work is maximum when the force is parallel to the displacement
Whenever work is done, there is also an energy transfer taking place. For instance, in the previous example, when the force is applied to the object, the object will accelerate (assume there is no friction), and will gain kinetic energy: therefore, there is a transfer of energy to the object.
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Answer:
Torque,
Explanation:
Given that,
Position of the flea,
Force acting on the flea,
We need to find the net torque about the origin on a flea located at coordinates. Its formula is given by :
On solving the cross product of r and F, we get :
So, the net torque about the origin on a flea is . Hence, this is the required solution.