What is an object that is slowing down but has a positive acceleration?

Question

I'm having some trouble with this question:
Give an example of an object that is slowing down but has a positive acceleration.
Anyone have any ideas?

I'm having trouble with this question:
Give an example of an object that is slowing down but has a positive acceleration.
Anyone have any ideas?
Also: Give an example of an object that is speeding up but has a negative acceleration.

Answer 1

Tough question. Normally it appears absurd that an object is slowing down but still has positive acceleration. This is possible as follows. Consider a spinning wheel and an object on spinning wheel. When the wheel is moving at a fixed rpm the object has a an acceleration of v^2/r where v is the tangential speed of the object and r is the radius of spinning wheel. Now you decelerate the wheel by applying brakes. The tangential speed will reduce from v to say v". However it will have positive acceleration of v"^2/r.

Answer 2

If an object is traveling at a negative velocity and is subject to a positive acceleration it will respond to the acceleration by slowing down.

Answer 3

turning. An merchandise's tangential speed might want to both be consistent, slowing down or rushing up. yet when there's a replace in the course of action, there is an acceleration in the course of the radius of curvature of the replace in speed. replacing course is continually seen a favorable acceleration one way or the different.

Answer 4

changing its direction by say 80 degrees and slowing down slightly would be +ve acceleration, as for an example that im not sure of

Answer 5

A couple of good sites for you:

http://www.glenbrook.k12.il.us/gbssci/phys/mmedia/kinema/pvna.html

http://www.physicsclassroom.com/Class/1DKin/U1L1e.html

http://www.hazelwood.k12.mo.us/~grichert/sciweb/accelsim.htm

You will find examples of both on these with good explanations.