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2 years ago

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Physics

1 answer:

Pepsi [2]2 years ago

8 0

Answer:

Explanation:

b) Gravity reduces the initial upward velocity to zero in a time of

t = v/g = 40/10 = 4 s

a) h = v₀t + ½gt² = 40(4) + ½(-10)4² = 80 m

v² = u² + 2as

h = (0² - 40²) / 2(-10) = 80 m

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Answer: C

Both Technicians A and B

Explanation:

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3 years ago

What are the components of friction?

Tresset [83]

<h2>Answer:</h2>

Friction:

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The main component of friction are:

Normal Reaction (R):

Suppose a block is placed on a table in the above picture, which is in resting state, then two forces are acting on it at that time.

The first is due to its weight mg which is working from its center of gravity towards the vertical bottom.

The second one is superimposed vertically upwards by the table on the block, called the reaction force (P). This force passes through the center of gravity of the block.

Due to P = mg, the box is in equilibrium position on the table.

Coefficient of friction ( μ ):

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Coefficient of friction, µ = force of friction / reaction force

μ = F / R

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Its value is between 0 to 1.

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The advantage of the force of friction is that due to friction, we can walk on the earth without slipping.
Brakes in all vehicles are due to the force of friction.
We can write on the board only because of the force of friction.
The disadvantage of this force is that due to friction, some parts of energy are lost in the machines and there is wear and tear on the machines.

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Using lubricants (oil or grease) in machines.
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Irina-Kira [14]

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inysia [295]

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