Question

Experiment 1:Friction

Table 1: Applied Force Required to Slide Cup

Cup Material	Force Applied F1 m1 = 300 g water	Force Applied F2 M2 = 150 g water	F1 /FN1	F2 /FN2
Plastic
	Avg:	Avg:	Avg:	Avg:
Styrofoam
	Avg:	Avg:	Avg:	Avg:
Paper	F1 m1 = 150 g water	F2 m1 = 100 g water	F1 /FN1	F2 /FN2
	Avg:	Avg:	Avg:	Avg:
Surface Description

Questions:

1. What happened toyour applied force F_app as you decreased the amount ofwater in the cup?

2. Assume the mass tobe exactly equal to the mass of water. Calculate the normal force(F_N) for 300 g, 150 g, and 100 g. Use these values tocompute the ratio of the Applied Force (F_app) to theNormal Force (F_n). Place these values in the rightmostcolumn of Table 1.

What do these last two columns represent? What is theratio of the normal forces F₁ / F₃₀₀? Comparethis to your values for F₂/ F₁₅₀, andF₃/F₁₀₀. What can you concludeabout the ratio between the Force Normal and the ForceFriction?

F_N= mg
F_{N (300 g)} = _________kg