Register to reply 
Calculating Work done by the Earth and the work done by the Spring 
Share this thread: 
#1
Apr2410, 03:11 AM

P: 2

1. The problem statement, all variables and given/known data
A mass of 0.091 kg hangs from a vertical spring in the lab room. You pull down on the mass and throw it vertically downward. The speed of the mass just after leaving your hand is 3.80 m/s. 2. Relevant equations (a) While the mass moves downward a distance of 0.09 m, how much work was done on the mass by the Earth? Include the appropriate sign. Work done by Earth = ............Joules (b) At the instant in part (a) when the mass has moved downward a distance of 0.09 m, the speed of the mass has decreased to 2.13 m/s. How much work was done on the mass by the spring? Include the appropriate sign. Work done by spring = ............Joules 3. The attempt at a solution To calculate Work I'm using the formula F times displacement So for (a) I calculated: 0.09m X 9.8m/s/s X 0.091kg = 0.080262J is that correct? For part B I have no idea what to do? Thanks if you can help. 


#2
Apr2410, 04:11 AM

P: 93

Part B mainly requires for you to calculate the difference in the kinetic energy.



Register to reply 
Related Discussions  
Work done to stretch a spring vs Work done by a spring?  Classical Physics  11  
Work Done on the Mass by a spring in the horizontal plane perpendicu to earth center  Classical Physics  1  
Work done on the Earth by the Sun  Introductory Physics Homework  2  
Is earth doing work on the moon?  Introductory Physics Homework  3  
Calculating Work  Advanced Physics Homework  3 