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LGS GCSE OCR Physics A > P2.3 Forces in Action > Flashcards

P2.3 Forces in Action Flashcards

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1
Q

What is a force?

A

A push or pull acting on an object due to an interationwith another object.

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2
Q

Explain the relationship between the force applied and the extension of an elastic object.

A

Extension is directly proportional to the force applied, provided that the limit of proportionality is not exceeded.

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3
Q

What is meant by inelastic deformation?

A
  • A deformation which results in the object being permenantly deformed
  • The object doesn’t return to its original shape when the force is removed
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4
Q

State the equation relating force, spring constant and extension. Give units.

A

Force (N) = Spring Constant (N/m) x Extension (m)

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5
Q

What is hooke’s law?

A

Hooke’s law states that the force applied is directly proportional to the extension of an elastic object.

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6
Q

At what point does Hooke’s Law no longer apply?

A

The Limit of Proportionality

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7
Q

What does the limit of proportionality look like on an extension-load graph?

A

Where the graph stop being linear

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8
Q

What type of energy is stored in a spring when it is stretched?

A

Elastic Potential Energy

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9
Q

What can extension be replaced with in the equation for spring force?

A

Compression

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10
Q

What is the equation for elastic potential energy? Give SI units for all quantities involved.

A

E = 1/2 k x^2

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11
Q

What is weight?

A

The force that acts on an object due to gravity and object’s mass.

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12
Q

What quantities does weight depend on?

A
  • The object’s mass

- The gravitational field strength at the given position in the field

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13
Q

What is the unit used for weight?

A

Newtons (N)

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14
Q

What is the unit for gravitational field strength?

A

N/kg

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15
Q

What is the equation used to calculate weight?

A

Weight (N) = mass (kg) x gravitational field strength (N/kg)

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16
Q

What is meant by an object’s centre of mass?

A

The single point through which an object’s weight can be considered to act through.

17
Q

What type of field does all matter have?

A

A gravitational field

18
Q

How does the gravitational field of an object change as the object becomes more massive?

A

The field strength increases

19
Q

What letter is used to represent gravitational field strength and what is its value at the surface of Earth?

A
  • g

- The value of g on the surface of the Earth is approximately 10N/kg

20
Q

What is the acceleration of an object falling in free fall with no resistive forces acting?

A

10m/s^2

21
Q

Why would your weight be different if you were on a different planet?

A

Different gravitational field strength, weight is a product of mass and gravitational field strength

22
Q

What piece of equipment can be used to measure an object’s weight?

A

A calibrated spring-balance or newton-meter

23
Q

What is an alternative name for the turning effect of a force?

A

A moment

24
Q

State the equation used to calculate the moment of a force. Give appropriate units.

A

Moment of Force (Nm) = Force (N) x Distance (m)

25
Q

What distance measurement is used when calculating a moment?

A

The perpendicular distance from the pivot to the line of action of the force.

26
Q

If an object is in equilibrium, what can be said about the moments acting on the object?

A

The clockwise moments are equal to the anticlockwise moments.

27
Q

What does the direction of a resultant moment acting on an object tell you?

A

The direction that the object will rotate around the pivot point.

28
Q

In any fluid, at what angle do the forces due to pressure act on a given surface?

A

At right angles (normal to) the surface.

29
Q

What can be said about the pressure in a simple hydraulic system?

A

The pressure in the fluid is constant through the fluid (it cannot be compressed or expanded)

30
Q

Explain how a simple hydraulic lift works.

A
  • The pressure is constant in the fluid
  • Force applied on each platform is equal to the product of pressure and area
    (F = pA)
  • One platform has a larger area than the other meaning the force produced is
    greater than the force applied to the smaller platform

LGS GCSE OCR Physics A (11 decks)

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