Questioner (1) List three ways to reduce friction between surfaces: (a) lubrinting the surface (b) make the object (e) Make th 4) (b) (c) mure streamlined Mer (2) In Part 1 of this experiment, you probably got inconsistent results. Give three possible reasons for this (other than human error). Be specific. (a) Surform little (3) According to theory, the value for u. should be smaller than, larger than, or equal to μk? Smoother larger Ms > Mk What did you observe in this experiment regarding this? (a) In Parts 1 and 2: Мы умк (b) In Parts 3 - 7: Why or why not? M₂ 7 Ms Had the wooded block been turned up on its edge, rather than flat side down, would one expect to measure the same values for the coefficients of friction that you measured? Yes or No

Answered: Questioner (1) List three ways to reduce friction between surfaces: (a) lubrinting the surface (b) make the object (e) Make th 4) (b) (c) mure streamlined Mer…

College Physics

11th Edition

ISBN: 9781305952300

Author: Raymond A. Serway, Chris Vuille

Publisher: Cengage Learning

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Concept explainers

Density of Solids

The density of a substance refers to how much matter is present in a given amount of space. It is expressed as the ratio of the mass of the substance to its volume.

Question

Need question 2 and question 4

Name
PHYS202L
Coefficient of Friction
In this experiment, the nature of the frictional forces
between two objects is investigated. The coefficient of
static friction and the coefficient of kinetic friction are
determined.
Procedure:
(1) Place the block on the inclined plane (large surface
down). Incline the plane until the block just begins
to slide; note the angle and record in Table 1.
Repeat three more times. Average these four values
and record.
(2) Place the block on the inclined plane and carefully
incline the plane until the block moves down the
plane at a constant speed when given a slight push
to start it moving. (This is tricky to do; a few
practice trials might be needed). Note the angle and
record in Table 2. Repeat three more times. Average
these four values and record.
(3) Determine the mass of the block (in grams) and
record in Table 3.
(4) Put the inclined plane in the horizontal position.
Attach a piece of string to the block and hang the
free end over the pulley. Connect a weight hanger to
the free end of the string. Carefully add mass to
the mass holder to find the minimum mass needed to
just cause the block to begin moving (including the
Table 3. u
mass of the hanger). Record this mass (in grams) in
(5) Place a 200 g mass on top of the block and again add
mass to the weight hanger to find the minimum mass
needed to cause the block to begin moving. Record in
Table 3.
800 g on the block.
(6) Repeat Step 5 by placing masses of 400 g, 600 g and

Expert Solution

Step 1

When there is a relative motion or tendency of relative motion between two rough surfaces then friction force comes in to existence. Friction may support a motion or oppose a motion but it always opposes relative motion. Friction forces are of two type :

1. Static friction : When there is tendency of relative motion but no actual relative motion between the surfaces then the friction force between the surfaces is called static friction force.

2. Kinetic friction : When there is a relative motion between the surfaces, kinetic friction works between the surfaces.