Q4: Does this minimum static friction coefficient depend on the mass of the object? Explain. Q5: Does this minimum static friction coefficient depend on where the ramp is, i.e. on the Moon, the Earth, or the Jupiter? Explain.

Q6:Let'sassume that the static and kinetic frictions are the same on the platform that the crate slides. If you place the crate on top of the ramp (8.9 m) and let it slide down. Using the simulation, estimate the friction coefficient when the crate stops at -8.9 m (right before it hits the wall on the left).

Q7: Find the value of the friction coefficient using Newton's law. Compare your answer with your estimation from question 6.

Q1:Let'sstart with the small crate. Select all the forces to be plotted. Place the crate at 8.9 m. Enter the minimum force needed to prevent the crate from sliding (from S.1/Q.1). Run the simulation. Write down all the forces calculated by the simulation. Do they match with your calculation and the way you analyzed the problem in Section 1/Question 1? Explain.

Q2: Now decrease the force applied on the crate by 1 N. Observe and explain all the changes you see in the parallel forces acting upon the crate. In this section, we will have a chance to analyze forces acting upon the objects. The graphs will be used to confirm some of the calculations we did in the previous two sections.

Q3: Place the crate at the bottom of the ramp, i.e. object position=1 m. What is the minimum force you need to apply to start sliding the crate upwards?

Q4: Which one requires more force, sliding it upwards, or preventitslidingdownwards, and why? Provide free-body diagrams and the equations for Newton's laws to support your argument.

Q5:Let'srepeat this experiment with the sleepy dog. Place the dog at the bottom of the ramp, i.e. object position=1 m. What is the minimum force you need to apply to start sliding the dog upwards?

Q6: Now apply 1N more. What do you observe? Why the crate and the dog move differently when you apply 1 N of extra force? (Hint: There are 2 reasons!)