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Gnesinka [82]
3 years ago
13

You wish to move a heavy box on a rough floor. The coefficient of kinetic friction between the box and the floor is 0.9. What is

the best way to reduce the force of friction between the box and the floor while the box is moving? A. Push or pull the box with a force parallel to the floor. B. Pull the box with a force directed up at an angle of 30° from the horizontal. C. Push the box with a force directed down at an angle of 30° from the horizontal. D. The coefficient of friction does not change so the force of kinetic friction acting on the block must be constant E. Both B and C result in the same force of friction.
Physics
1 answer:
Maksim231197 [3]3 years ago
5 0

Answer:

8%

Explanation:

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S_A_V [24]

1) Average speed

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Explanation:

1)

Speed is a scalar quantity which gives a measure of how fast a body is moving. It is equal to the ratio between the distance travelled by an object and the time taken to cover that distance:

speed = \frac{d}{\Delta t}

where

d is the distance covered

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It is important to note that being a scalar, speed does not have any direction. Moreover, distance is also a scalar quantity, which corresponds to the total length of the path covered by the object, regardless on the direction taken.

So, the equation "travelled distance/elapsed time" corresponds to the average speed. (where the term average refers to the fact we are not measuring the speed at a specific instant in time, but on a certain time interval \Delta t.

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Velocity is a vector quantity, so it has both a magnitude and a direction.

The magnitude of the velocity is given by:

velocity=\frac{\Delta x}{\Delta t}

where

\Delta x is the change in position (or displacement) of the object

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We must note that while distance does not depend on the direction, displacement does. In fact, displacement measures the difference between the initial and final position of the object.

Therefore, the equation "change in position / elapsed time" is equal to the average velocity.

Learn more about speed and velocity:

brainly.com/question/8893949 (speed)

brainly.com/question/5063905 (speed vs velocity)

brainly.com/question/5248528 (velocity)

#LearnwithBrainly

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mini stereo speaker cables are made of copper wire surrounded by robert electricity travel down the copper portion of the cable
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