Recent content by Alaa Mahmoud

OK thanks a lot :)

OK thank you the change in PE will be approximately 9 J But is there any PE except gravitational PE?

PE=mg(y initial)=2*9.8*0.5=9.8J right??

friction force is always to the opposite of motion we have two component of gravity : gmsinx ... gmcosx &the normal force :normal to the surface Then we can use Newton's laws to estimate F(friction)

Potential energy of gravity=mgy

I don't understand it well >>but there is normal force,F gravity and Friction force

Homework Statement a trophy being shown off by a careless athlete slips from the athlete's hands and drops on his toe.Choosing floor level as the y=0 point of your coordinate system,estimate the change in gravitational potential energy of the trophy-Earth system as the trophy falls.Repeat...