Forces and Newton's Laws

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coefficient of friction

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11 Terms

1

coefficient of friction

The ________: Number that tells how sticky two surfaces are.

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2

Kinetic friction

________ must always act in the opposite direction of motion.

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3

Normal force

________- perpendicular to incline.

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4

Normal force

________: the force of a surface on an object that acts perpendicular to the surface.

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5

Force of friction

the force of a surface on an object

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6

Kinetic friction

friction force when something is moving along the surface and acts opposite the direction of motion

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7

Static friction

friction force between two surfaces that arent moving relative to one another

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8

Newtons third law

The force of Object A on Object B is equal in amount and opposite in direction to the force of Object B on Object A

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9

Newtons second law

an objects acceleration is the net force it experiences divided by its mass, and is in the direction of the net force

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10

A 2-kg block and a 5-kg block are connected as shown above. The coefficient of friction between the 5-kg block and the flat surface is μ = 0.2.

(a) Calculate the magnitude of the acceleration of the 5-kg block. (b) Calculate the tension in the rope connecting the two blocks.

(a)acceleration is 1.4 m/s2

(b) tension is 17 N

<p>(a)acceleration is 1.4 m/s2</p><p>(b) tension is 17 N</p>
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11

A 2.0-kg cart is given a shove up a long, smooth 30° incline. If the cart is traveling 8.0 m/s after the shove, how much time elapses until the cart returns to its initial position?

(A) 1.6 s

(B) 3.2 s

(C) 4.0 s

(D) 6.0 s

(E) 8.0 s

B

<p>B</p>
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