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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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The specific heat of gold is 0.126 J/g°C. What mass of gold would change its temperature from 25.0 °C to 60.0 °C with the additi
fiasKO [112]
<span>The amount of heat energy needed to increase the temperature of a substance by </span>\Delta T<span> is given by:
</span>Q=m C_s \Delta T<span>
where m is the mass of the substance, Cs is its specific heat capacity and </span>\Delta T<span> is the increase in temperature of the substance.

In this problem, we have a certain mass m of gold, with specific heat capacity </span>C_s=0.126 J/g^{\circ}C<span>, to which we add Q=2825 J of energy. Its temperature increases by </span>\Delta T=60-25=35 ^{\circ}C<span>. Therefore, if we re-arrange the previous equation, we can find the mass of the block of gold:
</span>m= \frac{Q}{C_s \Delta T} = \frac{2825J}{0.126\cdot 35}} =641 g<span>
So, the correct answer is B.</span>
3 0
3 years ago
Read 2 more answers
Normal force is exerted ______ to the surface of an object.
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I think it would be B perpendicular
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3 years ago
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