Joel has a mass of 50kg he is spending his firs day on skis. His friend is trying to push him across a level patch of snow. Joel
1 answer:
Joel does not move because the frictional force acting on him is also 60 N
Explanation:
The force of static friction is a force that acts on objects at rest, in the direction opposite to the force that is trying to put the object in motion.
The value of the force of static friction goes from zero to a maximum value given by
where
is the coefficient of static friction
m is the mass of the object
g is the acceleration of gravity
In order to move the object, the force which is pushing it must overcome this maximujm value of the force of friction, otherwise the force of friction will balance the pushing object preventing the object to move.
In this problem, there are two forces acting on Joel:
- The pushing force, , forward
- The frictional force, , backward
According to Newton's second law of motion,
where a is the acceleration of Joel. However, Joel is at rest, so the acceleration is zero:
which means that the frictional force is equal to the pushing force of 60 N, preventing Joel from moving.
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Answer:
The change in potential energy is
Explanation:
From the question we are told that
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The distance traveled by the electron is
Generally the force on this electron is mathematically represented as
Where F is the force and q is the charge on the electron which is a constant value of
Thus
Generally the work energy theorem can be mathematically represented as
Where W is the workdone on the electron by the Electric field and is the change in kinetic energy
Also workdone on the electron can also be represented as
Where considering that the movement of the electron is along the x-axis
So
substituting values
Now From the law of energy conservation
Where is the change in potential energy
Thus