Physics equations/05-Friction, Drag, and Elasticity/Q:thirdLaw

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1

In the figure shown, the mass of m₁ is 5.4 kg, and the mass of m₂ is 3.2 kg. If the external force, F_ext on m₂ is 104 N, what is the tension in the connecting string? Assume no friction is present.

	a) 56.8 N
	b) 65.3 N
	c) 75.1 N
	d) 86.4 N
	e) 99.3 N

2

Referring to the previous problem (with m₁ = 5.4 kg, m₂ = 3.2 kg, and F_ext = 104 N), what is the acceleration? Assume no friction is present.

	a) 9.1 m/s2
	b) 10.5 m/s2
	c) 12.1 m/s2
	d) 13.9 m/s2
	e) 16 m/s2

3

Nine barefoot baseball players, with a total mass of 647 kg plays tug of war against five basketball players wearing shoes that provide a static coefficient of friction of 0.58 . The net mass of the (shoed) basketball team is 392 kg. What is the maximum coefficient of the barefoot boys if they lose?

	a) 0.351
	b) 0.387
	c) 0.425
	d) 0.468
	e) 0.514

4

Without their shoes, members of a 9 person baseball team have a coefficient of static friction of only 0.23 . But the team wins a game of tug of war due to their superior mass of 638 kg. They are playing against a 5 person basketball team with a net mass of 415 kg. What is the maximum coefficient of static friction of the basketball team?

	a) 0.321
	b) 0.354
	c) 0.389
	d) 0.428
	e) 0.471

5

In the figure shown, the mass of m₁ is 6.6 kg, and the mass of m₂ is 2.6 kg. If the external force, F_ext on m₂ is 126 N, what is the tension in the connecting string? Assume that m₁ has a kinetic coefficient of friction equal to 0.37, and that for m₂ the coefficient is 0.44 .

	a) 67.4 N
	b) 77.5 N
	c) 89.1 N
	d) 102.5 N
	e) 117.9 N

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