Chapter 2 - Mechanical Equilibrium Flashcards

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0
Q

What is the net force?

A

The sum of all the forces acting on an object.

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1
Q

What is a force?

A

A push or a pull.

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2
Q

If an object has 18N of force pushing on it’s right side and an opposite force of 14N pushing on its left side, what is the net force acting on the object?

A

4N to the right.

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3
Q

What is a vector?

A

An arrow that represents the magnitude and direction of a quantity.

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4
Q

How are vector quantities and scalar quantities different?

A

Vectors must have both magnitude and direction whereas scalers have only magnitude and no direction.

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5
Q

What is the equilibrium rule?

A

Whenever the sum of all forces acting on an object equals zero, the object is in mechanical equilibrium.

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6
Q

What is the support force and what’s another term for it?

A

The upward force that balances the weight of an object on a surface. The normal force.

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7
Q

For an object at rest on a horizontal surface, what is the support force equal to?

A

The weight of the object (due to the downward pull of gravity.)

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8
Q

What is a resultant?

A

The sum of two or more vectors.

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9
Q

How are static and dynamic equilibrium different?

A

Objects at rest are said to be in static equilibrium; objects moving at constant speed in a straight-line path are said to be in dynamic equilibrium.

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10
Q

Can an object be moving and yet still have the net force acting on it equal zero?

A

Yes. It’s called dynamic equilibrium.

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11
Q

Describe the Parallelogram Rule

A

To find the resultant of two non-parallel vectors, construct a parallelogram wherein the two vectors are adjacent sides. The diagonal of the parallelogram shows the resultant.

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12
Q

If a traffic light is suspended by two cables, as the angle between the two cables increases does the tension in the cables increase or decrease?

A

Increases

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13
Q

If a traffic light is suspended by two cables at different angles to the horizontal, which cable has the greater tension?

A

The more vertical cable.

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