Physics Help Forum Newtons Second Law

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 Oct 22nd 2008, 06:03 PM #1 Member   Join Date: Sep 2008 Posts: 42 Newtons Second Law A giant crane in Washington DC was tested by lifting a 2.232x10^6 kg load. a) find the magnitude of the force needed to lift the load with a net acceleration of 0 m/s^2. b) If the same force is applied to pull the load up a smooth slope that makes a 30.0 degree angle with the horizontal, what would be acceleration? Can someone please explain what I have, what I am looking for, and how to find it? I am kind of confused on what to do. Thanks
Oct 23rd 2008, 09:59 AM   #2
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 Originally Posted by Morgan82 A giant crane in Washington DC was tested by lifting a 2.232x10^6 kg load. a) find the magnitude of the force needed to lift the load with a net acceleration of 0 m/s^2. b) If the same force is applied to pull the load up a smooth slope that makes a 30.0 degree angle with the horizontal, what would be acceleration? Can someone please explain what I have, what I am looking for, and how to find it? I am kind of confused on what to do. Thanks
a) F-mg = ma, where F is the net force and g = 9.8m/s^2, a is the acceleration

You have to look for values and put them back into equation of motion having force, acceleration. They are usually given.

b) For this, you should find out the force actually lifting the slope ( calculated in a) and if there is any retarding force acting on slope. In this case it would be the weight component of load. Applying
F- mgsin30 = ma, you would find the acceleration

Practise more and you wound be familiar with all of them

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A gaint was tested by lifting a 2.232x10 kg load. Find (i) the magnitude of the force needed to lift the load with a net acceleration of 0m/s (ii) if the same force is applied to pull the load up a smooth slope that makes a 30 degree angle with the horiz

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