they're so wrong, they wouldn't help.
hage567 said:Have you drawn a diagram and labelled all the forces acting on the yo-yo? What do you know about circular motion? What information can you get from the question?
Not true. They could help us figure out where you're going wrong.
bilbobaggins said:okay here's what i did, i got the circumference was 15.77 from going 2 *.8 * 3.14 = 5.024. then it takes one second to go around the circle so velocity is 5.024m/s This looks OK.
then use fc= m*v/r
The v term should be squared. This is really Newton's second law, with centripetal acceleration in place of linear acceleraton.
i got fc = 49.73
then i did a=f/m
49.73N/.2kg
This is not correct. You've already found the centripetal acceleration above, that is what you need. This equation is for linear motion.
248.65 = a
F+T= ma
49.73 +T= .2kg * 248.65
so t = 6
There is only one force acting on the yo-yo, and that is the tension in the string.
But I think that's wrong
hage567 said:The tension in the string is acting as the central force. So you must use Newton's second law in the form for circular motion. Are we assuming the yo-yo is in a horizontal circle?
Note: I am guessing you are saying the yo-yo is traveling in a horizontal circle. If it was a vertical circle, we would have to take gravity into account as well. So I'm not sure which way it should be done.
hage567 said:I would say that's right, for a horizontal circle.
The tension of a yo-yo string refers to the force or tightness of the string when the yo-yo is in motion. It is the force that keeps the yo-yo attached to the string and allows it to move up and down.
The tension of a yo-yo string can be measured in units of force such as pounds or newtons. It can also be measured indirectly by observing the length of the string when it is at rest and comparing it to the length when the yo-yo is in motion.
The tension of a yo-yo string can be affected by various factors such as the material and thickness of the string, the weight and design of the yo-yo, and the speed and direction of the yo-yo's motion. The tension can also be affected by external forces such as gravity and air resistance.
The tension of a yo-yo string plays a crucial role in its performance. A higher tension can increase the yo-yo's responsiveness, making it easier to control and perform tricks. However, too much tension can also cause the yo-yo to bind or snag, hindering its movement.
The tension of a yo-yo string can be adjusted by changing the length of the string or by altering the weight and design of the yo-yo. Some yo-yos also have adjustable mechanisms or bearings that can affect the tension. Additionally, proper maintenance and care of the yo-yo and string can help maintain optimal tension.