- #1
Physics-Pure
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Homework Statement
A block of mass 3 kg, which has an initial
speed of 9 m/s at time t = 0, slides on a
horizontal surface.
Find the magnitude of the work that must
be done on the block to bring it to rest.
Answer in units of J
I already got 121.5 for this problem
If a constant friction force of magnitude
4 Newtons is exerted on the block by the surface, find the magnitude of the acceleration of
the block.
Answer in units of m/s^2
How far does the block slide before it comes
to rest?
Answer in units of m
A team of dogs drags a 94.8 kg sled 2.63 km
over a horizontal surface at a constant speed.
The coefficient of friction between the sled
and the snow is 0.228.
The acceleration of gravity is 9.8 m/s^2
Find the work done by the dogs.
Answer in units of kJ
Find the energy lost due to friction.
Answer in units of kJ
Homework Equations
F = μmg
W = Fd
W = μmgd
The Attempt at a Solution
I got the first third of problem one, but I don't know how to account for the frictional force.
For the second problem, I don't know how to account for the force of gravity.
Thanks anyone,
Physics-Pure