- #1
Hamiltonian
- 296
- 193
- Homework Statement
- Here a block of mass 1kg is placed at a point A on a rough track. If slightly pushed towards the right, it stops at point B.
we need to calculate the work done by gravity between points A and B
- Relevant Equations
- ##W_g = -\Delta U##
we know ##W_g = -\Delta U##
but here to find ##\Delta U## we will need another equation
won't it be wrong to write $$-\Delta U = -\int_1^{0.8}mgdy$$
as this equation is derived from ##W_g = -\Delta U## and as we have 2 unknowns we will need two equations.
this is a rather easy problem but I am not able to understand why we can use ##\Delta U = mg\Delta h ## here as we do not know the work done by gravity.
Also since we are not given the value of ##\mu## I am not using the work energy theorem