Science Homework Help

Hello ,I have some work to do , everything is explained below .

Read the information provided under this simulation (Links to an external site.) of an object rotating with uniform circular motion in a horizontal circle. This means when looking at the simulation you have a bird’s eye view (looking from the top-down). Put a checkmark in the Check here to show velocity and acceleration vectors box.

1- Your Initial Post 

What does the green vector (whatever color it is on your device – it points from the object toward the center of the circular path) represent and why does it always point toward the center of the circular path?  Are there any conditions that would make it change direction? If so, describe those conditions. Make sure you are answering questions using your own words. No credit will be given otherwise.  Is the direction of the green vector surprising to you?  Explain why or why not.

2- Your reply post  >>>> (I will send my classmate reply later, i can’t see their answers unless i post mine )

Reply to a classmate who does not have any replies and not on the same day as your initial post. Compare and contrast your answer to theirs. Correct any misconceptions they may have or any errors they may have made. In your reply explain what happens to the green vector for the following situations: speed is increased, speed is decreased, radius is increased and radius is decreased. Also, discuss the direction of the net force on this object. Explain what this force would be if the ball were to be connected to the center of the circular path with a string. What would the force be if the ball were sitting on a flat rotating disk (the ball doesn’t roll but the disk does rotate)?

first reply

The green vector was representing the acceleration of the circle (object). The green vector faced the center the whole time because the centripetal acceleration is always towards the center of the object. The direction of the green vector could be changed under certain circumstances. These would include if there was a different speed of the object, then the green vector would no longer point to the center of the circle. The position of the green vector pointing to the center was not surprising to me since a centripetal acceleration always faces the center of an object.

sec reply

The force labeled with the green arrow is the centripetal force. Centripetal force always points towards the center of a circular path. Centripetal force is one vector of the force acting on the object. The centrifugal force is the other labeled on the object. For uniform circular motion, these 2 forces must be equalivent. The object in a circular path is always changing direction towards the center of the circle and therefore the centripetal force will always point directly to the middle. Any object in a circular motion will have a centripetal force acting directly towards the middle. In the simulation we can see no matter how we change the radius or velocity, the green arrow always will point directly to the center. The direction of centripetal force is not surprising. It makes sense that for an object to have circular motion one vector must be acting towards the center of the circle.