Ch - 5 (Hooke's Law & Pressure) Flashcards

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1
Q

What is Hooke’s Law?

A

The extension of a spring is proportional to the applied force.

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2
Q

What is the formula?

A

F = kx

F = Force applied
k = spring constant
x = is the extension

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3
Q

Why can a spring be stretched to a limit only?

A

This is because there is an elastic limit.

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4
Q

When is the graph of spring proportional?

A

If the graph is a straight line going through the origin.

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5
Q

When is the relationship linear?

A

When the graph is a straight line but does not go through the origin.

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6
Q

What is pressure?

A

The concentration of force per unit area.

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7
Q

What is the formula of pressure?

A

P = F/A

P = Pressure (Pa)
F = Force (N)
A = m2

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8
Q

What does this formulae tell us?

A
  • The larger the surface area, the smaller the pressure.
  • The smaller the surface area, the larger the pressure.
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9
Q

What is a fluid?

A

A liquid or gas.

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10
Q

What happens when an object is immersed in a liquid?

A

The fluid will exert pressure, squeezing the object.

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11
Q

What are the three things that happen when object is immersed in liquid?

A
  1. Pressure is exerted all over the surface of the fluid in all directions.
  2. Pressure exerted on objects in fluids create forces against the surfaces.
  3. These forces act at 90 degrees (at right angle) to the surface.
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12
Q

When does the pressure in liquids increase?

A
  • Depth of the fluid
  • Increased density of the fluid.
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13
Q

What is the formula for pressure in fluids?

A

^P= pg^h

^P = Change in pressure (Pascals)

p = density in liquid (kg/m3)

g = gravitational field strength (N/kg)

^h = change in height (m)

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14
Q

When there is a graph of Force (y-axis ) by extension (x-axis) and there a two lines which will have a higher k?

A
  • Steeper line will have a higher k
  • Less steeper line will have a lower k
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15
Q

When there is a graph of edtensio (y-axis ) by force (x-axis) and there a two lines which will have a higher k?

A
  • More steeper will have less k
  • Less steeper will hv a higher k
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16
Q

When there is a graph, what should we always check?

A

X and Y axis.