Oscillation is a type of motion where a body move back and forth motion about a pivot point. Moving swing is an example for such motion.
Here is a word problem to determine the velocity of moving swing. Balanced or unbalanced forces when applied on any body there occur a motion and the speed at which the body moves is velocity of that body.
Topic : Velocity of Moving Body
Since Potential Energy is equal to Kinetic energy in the system, m*g*h = 1/2*m*v2 is the formula to find velocity of a body with mass m, height h and g is constant gravitational force.
Question : A 40 kg girl is swinging on a 3m long swing. At her maximum height, the swing makes an angle of 40 degrees with the vertical rest position. Determine the girl’s maximum speed, ignoring frictional effects.?
Solution :
Mass= 40 Kg
Height =3*sin (40)
Here PE = KE
Mgh=1/2mv2
V2 = 2*g*h = 2*9.8*3*sin (40) = 12.59
V= 3.55 m/sec
The girl’s maximum speed, V= 3.55 m/sec
Whenever you have to solve similar kind of question, like finding velocity or any unknown qantities, consider the same formula substitute the values and calculate.
If you have any kind of queries related to the above motion topic please do write to our physics help.
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