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Alisiya [41]
3 years ago
13

How can you increase the magnitude of friction between two surfaces ? How can you decrease the magnitude of friction

Physics
1 answer:
Mice21 [21]3 years ago
8 0
The frictional force between two surfaces is given by:
F_f = \mu F_p
where
\mu is the coefficienct of friction
F_p is the force with which one surface is pushed against the other one

Looking at the formula, we see that there are two possible ways to increase the friction:
1) by increasing the coefficient of friction \mu (for instance, by making the surfaces more "rough"
2) by increasing F_p, the force  with which one surface is pushed against the other

Similarly, in order to decrease the friction, the two possible ways are:
1) by reducing the coefficient of friction
2) by reducing the force F_p
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You and your friend are pushing a box at the same constant speed. You pushed 20 feet in 10 minutes, your friend was pushing for
anzhelika [568]

Answer:

60 N.C

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Ksivusya [100]

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3 years ago
À A car moves with an initial velocity of 18 m/s due north. Find the velocity of the car after 7 Os if
Nonamiya [84]

Answer:

(a) v_f=28.5m/s

(b) v_f=7.5m/s

Explanation:

Hello.

(a) In this case since the car is moving at an initial velocity of 18 m/s due north, the final velocity is computed considering the acceleration as positive since it is due north as well:

v_f=v_0+at=18m/s+1.5m/s^2*7s\\\\v_f=28.5m/s

(b) In this case, since the car is moving due north by the acceleration is due south it is undergoing a slowing down process, thereby the acceleration is negative therefore the final velocity turns out:

v_f=v_0+at=18m/s-1.5m/s^2*7s\\\\v_f=7.5m/s

Best regards.

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3 years ago
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