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r-ruslan [8.4K]
2 years ago
9

Chen is testing the friction of three surfaces. he pushes the same ball across three different surfaces with the same force and

measures the distance the ball rolls over each surfacel. the ball moved ten inches across surface 1, six inches across surface 2, and fifteen inches across surface 3. which could most likely describe the three surfaces? surface 1 is ice, surface 2 is gravel, and surface 3 is blacktop. surface 1 is gravel, surface 2 is ice, and surface 3 is blacktop. surface 1 is blacktop, surface 2 is gravel, and surface 3 is ice. surface 1 is blacktop, surface 2 is ice, and surface 3 is gravel.
Physics
1 answer:
e-lub [12.9K]2 years ago
5 0

<u>Surface 1 is blacktop, Surface 2 is gravel, and Surface 3 is ice.</u> is most likely describe the three surfaces.

<h3>What is friction?</h3>

Friction, force that resists the sliding or rolling of one solid object over another. Frictional forces, such as the traction needed to walk without slipping, may be beneficial, but they also present a great measure of opposition to motion. About 20 percent of the engine power of automobiles is consumed in overcoming frictional forces in the moving parts.

The major cause of friction between metals appears to be the forces of attraction, known as adhesion, between the contact regions of the surfaces, which are always microscopically irregular. Friction arises from shearing these “welded” junctions and from the action of the irregularities of the harder surface plowing across the softer surface.

Learn more about friction

brainly.com/question/1424758

#SPj4

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Answer:

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Since the force of friction is the only force acting on the box, according to Newton's second law its magnitude must be equal to the product between mass (m) and acceleration (a):

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We can find the mass of the box from its weight: in fact, since the weight is W = 50.0 N, its mass will be

m=\frac{W}{g}=\frac{50.0 N}{9.8 m/s^2}=5.1 kg

And we can fidn the acceleration by using the formula:

a=\frac{v-u}{t}

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Substituting, we find

a=\frac{0-1.75 m/s}{2.25 s}=-0.78 m/s^2

(the acceleration is negative since it is opposite to the motion, so it is a deceleration)

Therefore, substituting into eq.(1) we find the force of friction:

F_f = (5.1 kg)(-0.78 m/s^2)=-4.0 N

Where the negative sign means the direction of the force is opposite to the motion of the box.

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