1. A 3 kg block is sliding across a horizontal
surface. The initial speed of the block is 4 m/s, but because
of friction the block’s speed will decrease at a constant rate
(i.e., constant acceleration) until the block finally
comes to a stop after sliding 8 m. What is the magnitude of
the acceleration of the block (in m/s2)?
2. A 4 kg block is launched up a 30° ramp with an initial
speed of 5 m/s. The coefficient of kinetic friction between
the block and the ramp is 0.25. What is the velocity (in m/s)
0.5 seconds after the block is launched?
3.Two constant forces are applied to a 5 kg block that is
initially at rest on a frictionless and horizontal surface.
What is the displacement (in m) of the object 2 s after the forces
are applied?
4. A block with a mass of 4 kg is pulled across a
horizontal surface at constant speed by a horizontally directed
rope.
The coefficient of kinetic friction between the block and the
surface is μk = 0.2. What is the tension
(in N) in the rope?
5. A 4 kg block is sliding down a vertical wall while being
pushed by an external force as shown in the figure. What
coefficient of kinetic friction would be required for the block to
move down the wall at constant speed if the magnitude of the
external force is 100 N?