Answer:
Newton is the SI unit used to measure force. It is represented by the symbol N.
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When the angle of the ramp increases, the weight of the box acting perpendicular to the ramp decreases.
<h3>
Normal reaction of the box</h3>
The normal reaction of the box is due to weight of the box acting perpendicular to the ramp.
Fn = Wcosθ
<h3>when the angle of the ramp = 30⁰</h3>
Fn = Wcos(30)
Fn = 0.866W
<h3>when the angle of the ramp = 45⁰</h3>
Fn = W x cos(45)
Fn = 0.7071W
Thus, when the angle of the ramp increases, the weight of the box acting perpendicular to the ramp decreases.
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The fraction of the magnitude of the kinetic energy lost is . = 0.955.
using the law of conservation of momentum,
kinetic energy lost,
Δ
(see image )
now, for the other part
the fraction of the kinetic energy lost,
ΔKE/ KE =
ΔKE/ KE =
ΔKE/ KE = 0.955.
what is kinetic energy ?
The energy that an object has as a result of motion is known as kinetic energy. It is stated as the effort needed to transfer a bulk body from rest to the given velocity. The body holds onto the kinetic energy it gained during its acceleration until its speed changes.
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Answer:
When any work is done against friction then work done opposes to frictional force.