Can
you help him find the coefficient of friction?
PS:
He forgot the mass of the car and doesn’t know his
mass either!
µ=0.92
5)
A ball is dropped from rest and it collides with a spring which brings it to rest over a distance of 0.15
m.
The ball was originally 1.2 m above the spring whose constant is 350 Nm.
What is the mass of the
ball?
0.298 kg
(BE CAREFUL ON THIS ONE WHERE YOU DEFINE H=0)
6)
A mover uses a dolly (mass 8 kg) to move a large box (100 kg) up a 20 m long incline which is
angled at 10° in 8 s.
Assume box starts and ends at rest.
a)
How much work does the mover do?
3,675.8 J
b)
What is the change in gravitational potential energy?
3,675.8 J
c)
What is the mover’s power output?
459.5 W
7)
How can you get the work done on an object by looking at a Force vs. Distance graph?

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A horizontal spring shoots a 3kg box along a horizontal frictionless surface.
The box then goes up a
hill inclined at 32º and the hill has a coefficient of kinetic friction of 0.3.
The box travels 50m along the
inline before stopping.
If the spring constant for the spring is 780N/m, how far is the spring initially

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