Question

A 4 kg block is sliding at an initial speed of 10 m/s across a surface, encountering a constant friction force of 9 N. How much work is done on the block after it slides 20 cm?

How fast is the block moving after sliding 20 cm?

What's the total distance the block travels before coming to rest?

What is the average power of friction on the block over the time it takes the block to come to rest?

What was the instantaneous power of friction on the block after it slid the first 20 cm?

Answer #1

3) A 3 kg block is sliding at an initial speed of 9 m/s across a
surface, encountering a constant friction force of 10 N. How much
work is done on the block after it slides 25 cm? Correct, computer
gets: -2.50 J Hint: Does the block gain or lose energy during this
process? What sign does this imply for the work done on it? 4) How
fast is the block moving after sliding 25 cm? Correct, computer
gets: 8.91...

A 2.0 kg block at rest is accelerated uniformly across a floor
to a speed of 10 m/s in 3.0 s. The coefficient of kinetic friction
between the block on the floor is 0.15.
a. How much work is done on the block by the accelerating force
in the 3.0s interval?
b. What is the instantaneous power due to that force at the end
of the interval?
c. What is the average power done by the force throughout the
interval?

A block of 1 kg, initially launched with a speed of 4 m/s rolls
across a horizontal table surface over a distance of 3 m before
coming to a stop, due to friction. I am not specifying μk, but I am
telling you that μs < 1. Next the block is attached to a
horizontal, unstretched spring of spring force constant k = 10 N/m,
and given the same launching speed, on the same (horizontal) table
surface. The other end...

A 1.0 kg block of wood is to be launched across a slippery floor
by a compresssed spring. The stiffness constant of the spring is
100 N/m, and the spring is initially compressed by 0.50 meters. If
the block slides 10 meters before coming to rest, what is the
coefficient of sliding friction? If the block were to slide 0.50
meters - the very same distance the spring was compressed - what
would be the coefficient of sliding friction?

A 2.5-kg block is sliding along a rough horizontal surface and
collides with a horizontal spring whose spring constant is 320 N/m.
Unstretched, the spring is 20.0 cm long. The block causes the
spring to compress to a length of 12.5 cm as the block temporarily
comes to rest. The coefficient of kinetic friction between the
block and the horizontal surface is 0.25. a) How much work is done
by the spring as it brings the block to rest? b)...

1. A bottle of mass 0.5 kg is given an initial velocity of 2.3
m/s on a rough, horizontal surface. Draw a diagram showing all of
the forces on the bottle as it moves across the surface. The bottle
comes to rest after travelling a distance of 1.3 m. Calculate the
time taken to come to rest, the deceleration and the friction
force.
2. Block A has a mass of 4 kg and block B has a mass of 6...

Another block, another spring. This time around, the block (m =
1.18 kg) is compressing a spring with spring constant k = 273 N/m
by 36.3 cm. It is released from rest so it then slides along the
horizontal surface shown. This time, there is friction on the
horizontal surface, with a coefficient of friction between the
block and surface of μk = 0.11. In addition, there is a steady wind
blowing to the right, exerting a constant 6.7 N...

An 8.70-kg block slides with an initial speed of 1.80 m/s down a
ramp inclined at an angle of 25.3 ∘ with the horizontal. The
coefficient of kinetic friction between the block and the ramp is
0.87. Use energy conservation to find the distance the block slides
before coming to rest.

A block with a mass m1=2.3kg is sliding along a frictionless
surface with a velocity of 7.3m/s. It collides inelastically with
mass m2=1.7kg and the two blocks stick together. They then slide
down a frictionless incline with a Height 95cm. How fast are they
going when they reach the bottom of the incline?
Part B. If the coefficient of kinetic friction, uk is 0.15 along
the surface at the bottom of the ramp. What distance will the
blocks side before...

The speed of a block (weight= 10N) sliding across a
horizontal ice surface decreases at the rate of 1.5 m/s^2 . whats
The coefficient of kinetic friction between the ice amd the
block?

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