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iogann1982 [59]

3 years ago

7

The weakest type of friction that occurs between solid surfaces is _____ friction

2 answers:

irga5000 [103]3 years ago

8 0

Rolling friction, hope this helps

Evgen [1.6K]3 years ago

4 0

Answer:

Static, sliding, and rolling friction occur between solid surfaces. Static friction is strongest, followed by sliding friction, and then rolling friction, which is weakest. Fluid friction occurs in fluids, which are liquids or gases.

Explanation:

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3 years ago

A 35 g steel ball is held by a ceiling-mounted electromagnet 4.0 m above the floor. A compressed-air cannon sits on the floor, 4

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Answer:

7.9 m/s

Explanation:

When both balls collide, they have spent the same time for their motions.

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This is purely under gravity. It is vertical.

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Distance, <em>s</em> = 4.0 m - 1.2 m = 2.8 m

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Motion of plastic ball

This has two components: a vertical and a horizontal.

The vertical motion is under gravity.

Considering the vertical motion,

Initial velocity, <em>u </em>= ?

Distance, <em>s</em> = 1.2 m

Acceleration, <em>a</em> = -<em>g </em> (It is going up)

Using the equation of motion

$s = ut+\frac{1}{2}at^2$

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Substituting the value of <em>t</em> from the previous equation,

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$u\sqrt{\dfrac{5.6}{g}} = 4.0$

Taking <em>g</em> = 9.8 m/s²,

$u = \dfrac{4.0}{0.756} = 5.29 \text{ m/s}$

This is the vertical component of the initial velocity

Considering the horizontal motion which is not accelerated,

horizontal component of the initial velocity is horizontal distance ÷ time.

$u_h = \dfrac{4.4\text{ m}}{0.756\text{ s}} = 5.82\text{ m/s}$

The initial velocity is

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