A box of mass m = 10.0 kg moving at 0.500 m/s is pushed by a…

A box of mass m = 10.0 kg moving at 0.500 m/s is pushed by a force F = {F} N across a horizontal floor.  The applied force is directed at an angle θ = 60.0⁰ as shown in the drawing.  The coefficients of static and kinetic friction between the box and the floor are μs=0.400 and μk=0.300, respectively.  What is the work done by the gravitational force after the box moved a distance of d = 10.0 m in joules? Please enter your unit as “J”.

A 50 N of force F is applied to a block of 100 N as shown. T…

A 50 N of force F is applied to a block of 100 N as shown. The kinetic coefficient between the block and the supporting surface is 0.3.  Determine the acceleration of the block in m/s2. Enter your answer with two significant figures.   Please enter your unit as “m/s^2”.

In target practice, a thick board stops a bullet at a penetr…

In target practice, a thick board stops a bullet at a penetration depth of {d} cm.  Find the average frictional force that stops the bullet.  Hint, you can use two approaches,  Newton’s Second Law or Law of Energy Conservation to solve this problem.  Express your answer in kN and enter your unit as “kN”.