A person bounces up and down on a trampoline, while always staying in contact with it. The motion is simple harmonic motion, and
1 answer:
Answer:
(a) 45 cm (b) 3.305 rad/sec (c) 1.4875 m/sec
Explanation:
It is given that the motion is simple harmonic and it takes 1.90 sec to complete a cycle
The frequency is defined as the reciprocal of time taken to complete one cycle so
(a) As it is given that the height of each bounce above the equilibrium positon is 45 cm so amplitude will be 45 cm
(b) The angular frequency ω is given by rad/sec
(c) The maximum speed is given by
where ω is angular frequency of the motion and A is the amplitude So
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Answer:
<em>The normal force is perpendicular to the displacement</em>
<em>The static friction force produces no displacement</em>
Explanation:
Work Done By Special Forces
The work is a physical magnitude that measures the dot product of the force applied to an object by the displacement it produces in it.
It can be written in its scalar version as
Being F and d the magnitudes of the force and displacement, and the angle between them
If the angle is zero, the work is at maximum, it the angle is 90°, the work is zero. If the angle is between 90° and 180°, the work is negative.
The normal force acts in the vertical direction when the object is being pushed horizontally. It means the angle between the force and the displacement is 90°, thus the work is
The work is zero because the force and the displacement are perpendicular
The static friction force exists only when the object is being applied a force of a magnitude not large enough to produce movement, i.e. the object is at rest. If the object is moved, the friction force is still present, but it's called dynamic friction force, usually smaller than the static.
Since in this case, there is no displacement, d=0, and the work is