Question

If someone could just walk me through the steps on how to solve these 4 questions that I have, it would be very helpful.

(4)
A person pus
hes on the handle of a lawnmower with a force of 280. N. If the
handle makes an angle of 40.0 degrees with the ground, calculate the coefficient
of friction if the lawnmower weighs 350. N and is moving at a constant velocity.

Answer 1

(5)
An inclined plane 20.0 m lon
g has a slope of 40.0 degrees. An object with a mass
of 170. kg is sitting on the top of the incline. (a) If the coefficient of friction
between the mass and the plane is 0.235, find the velocity of the object at the
bottom of the incline. (b) If the bl
ock slides across a horizontal floor after
reaching the bottom of the incline, how far will the block travel if the coefficient
of friction remains 0.235.
(6)
A box having a mass of 80.0 kg is dragged across a rough horizontal floor by
means of a rope tied on
the front of it. The coefficient of friction between the box
and the floor is 0.450. If the angle between the rope and the floor is 38.0 degrees,
what force must be exerted on the rope to move the box at a constant velocity?
(7)
For the diagram below, the
coefficient of friction is 0.0500. Find the velocity of
the system and the distance the system moves in 3.00 seconds starting from rest.

Answer 2

Do you know how to determine the force needed when you know the mass and the Coefficient of Friction?
Also, #7 could involve both the Static and the Kinetic Coefficients of Friction.

Answer 3

Also, is the force on #4 assumed to be applied along the direction of the handle?

Answer 4

No I don't. I get really confused with which formulas I'm supposed to use.