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Kine 4800 biomechanics > Ch.12 pt 2 > Flashcards

Ch.12 pt 2 Flashcards

1
Q

From a mechanical standpoint, __ defined as force applied against a resistance, multiplied by the displacement of the resistance in the direction of the force.

A

Work

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2
Q

In mechanics, __ refers to the amount of mechanical work performed in a given time.

A

Power

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3
Q

What is the unit of power?

A

Watt

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4
Q

What is the unit of power?

A

Watts

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5
Q

Kinetic energy is?

A

energy of motion

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6
Q

Potential energy is?

A

energy of position

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7
Q

What are formulas for power?

A

P=Fv
P=Force x distance/ change in time

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8
Q

What does 1 watt equal to?

A

1 J/s

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9
Q

What is the unit of mechanical energy?

A

Joule

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10
Q

What is “k” in the formula for strain energy?

A

spring constant

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11
Q

What is “x” in the formula for strain energy?

A

distance over which the material is deformed

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12
Q

The law of conservation of mechanical energy states that when gravity is the only acting external force, a body/s mechanical energy __ __.

A

remains constant

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13
Q

__ __ is the capacity to do work by virtue of a deformed body/s return to its original shape.

A

Strain energy

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14
Q

What is true about the principle of work and energy?

A

The work of a force is equal to the change in energy that it produces in the object acted on

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15
Q

What is the formula for the law of conservation of mechanical energy?

A

(PE+KE)=C

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16
Q

Calculate the kinetic energy of a 500kg rollercoaster that is moving with a speed of 15 m/s

A

56250 J

17
Q

Richard lifts a 300kg boulder and places it at an elevation of 2m. The boulder’s potential energy at the point is __.

A

588.6 J

18
Q

What is the formula for the principle of work and energy?

A

W= changeKE + changePE + changeTE

19
Q

A 25kg ball rolling with a velocity of 18 m/s has a kinetic energy of __.

A

4050 J

20
Q

When a 40kg bar is elevated to a height of 3m, the potential energy at that point is __.

A

1177.2 J

Kine 4800 biomechanics (21 decks)

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