Pulling/force/friction problem/throwing problem

Thread starter Gary531
Start date Aug 16, 2010

Click For Summary

The discussion focuses on difficulties with pulling, force, friction, and throwing problems in physics. Participants emphasize the importance of showing work to receive effective help. The first problem typically relates to Newton's laws and analyzing forces acting on a body. The second problem often involves basic 2D kinematics, particularly projectile motion. Understanding these concepts is crucial for solving related problems effectively.

Aug 16, 2010

Gary531

These are supposed to be so easy, but I still don't get them!

Physics news on Phys.org

Aug 16, 2010

N-Gin

What exactly don't you get? We can't help you if you don't show us your work! Generally, the first one involves Newton's laws (also look for the forces on the body). The second one involves some simple 2D kinematics (look for topics on projectile motion).

Thread 'Correct statement about size of wire to produce larger extension'

The answer is (B) but I don't really understand why. Based on formula of Young Modulus: $$x=\frac{FL}{AE}$$ The second wire made of the same material so it means they have same Young Modulus. Larger extension means larger value of ##x## so to get larger value of ##x## we can increase ##F## and ##L## and decrease ##A## I am not sure whether there is change in ##F## for first and second wire so I will just assume ##F## does not change. It leaves (B) and (C) as possible options so why is (C)...

View full post »