Lab: Kinetic and Static Friction

Lab #6 Report

Kinetic and Static Friction

Physics

Period: 1

A. Partners:

* AAAAAAA

* BBBBBB

B. Purpose:

* To determine the difference of static and kinetic friction.

C. Hypothesis: Which will be greater, static, or kinetic function.

* Static friction will be greater than kinetic friction.

D. Equipment: Spring Scale, wooden block, friction board, balance, 1 of 1000 g and 2 of 500 g mass.

E. Procedure: Place a 500g mass on a wooden block and place the wooden block on the cork surface.

Pull the wooden block gently with the spring scale and observe the maximum reading just before the block moves. Record the static friction. Now move the block at constant speed. Record the kinetic friction. Add mass on the wooden block at 500g increments.

F. Data:

Mass of wooden block: 666 g = 0.666 kg

Increments of spring scale: 25 g

| 500 g | 1000 g | 1500 g | 2000 g |

Static | 325 g | 475 g | 900 g | 1000 g |

Kinetic | 200 g | 400 g | 600 g | 775 g |

G. Analysis:

1.Make a graph of mass vs. friction force for kinetic and static friction forces.

2. Using formula Ffric= Mfn to calculate coefficient of friction for static friction.

Cork with 1000 g mass with 475 grams of static friction

Cork with 500 g mass with 350 grams of static friction

475 g 1 kg

1000 g

350 g 1 kg

1000 g

= 0.350 kg

= 0.475 kg

0.475 x 9.8 = 4.655 N

0.350 x 9.8 = 3.43 N

Cork with 2000 g mass with 1000 grams of static friction

Cork with 1500 g mass with 900 grams of static friction

1000 g 1 kg

1000 g

900 g 1 kg

1000 g

= 1.000 kg

= 0.900 kg

1.000 x 9.8 = 9.8 N

0.900 x 9.8 = 8.82 N

Cork with 1000 g mass with 475 grams of static friction

Ffric=...