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Ilya [14]
2 years ago
11

What would be an ideal experiment to test how different types of surfaces affect friction?

Physics
1 answer:
qaws [65]2 years ago
6 0
<span>C) Two objects of equal weights placed on a glass surface and a wooden surface.</span>
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Two forces F1 and F2 of equal magnitude are applied to a brick of mass 20kg lying on the floor as shown in the figure above. If
jeka57 [31]

Let F_{1}=F_{2}=F.

Normal force equals (using Newton's third law) N=mg+F\sin30^{o}-F\sin37^{o}.

F_{f}\leq \mu N = \mu(mg+F\sin30^{o}-F\sin37^{o}), but F_{f}\leq F(\cos30^o+\cos37^o) for all F_{f} (in order to start moving the break). Therefore F(\cos 30^o+\cos37^o)\geq \mu(mg+F\sin30^{o}-F\sin37^{o}), solving for F: F\geq \frac{\mu mg}{\cos30^o+\cos37^o-\mu\sin30^o+\mu\sin37^o}\approx 46,91\; \textbf{N}

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2 years ago
What is efficiency?<br>​
tatyana61 [14]

Explanation:

the state or quality of being efficient or able to accomplish something

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A girl on a motorbike passes by at a speed of 15 m/ sec. her mass is 40 kg. what is her kinetic energy
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KE = 1/2 * m* v^2
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 = 4500 J

hope it helped


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