A force that acts on an object through physical contact.
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Electric Field
A region where a charge will experience a non-contact electrostatic force.
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Equilibrium
An object in equilibrium has a zero resultant force and a zero resultant moment.
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Force Field
A region where an object will experience a non-contact force.
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Force Vectors (H)
An arrow that represents a force. The length represents the force's magnitude and the arrowhead shows the direction in which it acts.
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Free Body Diagram (H)
A visual representation of the forces that act on an object.
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Friction
A resistive contact force that acts to oppose the relative motion between two surfaces.
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Gears
A simple mechanism that can transmit the rotational effect of a force.
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Gravitational Field
A region where a mass will experience a non-contact gravitational force.
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Lever
A simple mechanism that can transmit the rotational effect of a force.
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Lubrication
The application of a lubricant (such as oil) to reduce the friction that acts between surfaces. This may improve the efficiency of a system.
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Magnetic Field
A region where a magnetic material will experience a non-contact magnetic force.
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Moment
The turning effect of a force, equal to the product of the magnitude of the force and the perpendicular distance from the pivot to the line of action of the force.
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Newton Metre
The unit of a moment.
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Non-Contact Force
A force that acts on an object at a distance. There is no physical contact, and instead the force acts through a field.
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Principle of Moments
For an object in equilibrium, the sum of the clockwise moments about any point on the object must equal the anticlockwise moments about the same point.
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Resolution of Forces
All forces can be resolved into two perpendicular components that have the same effect as the single force.
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Resultant Moment
The single moment that has the same effect as the sum of all the other clockwise and anticlockwise moments acting on an object.
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Scalar Quantities
Quantities that only have a magnitude, not a direction.
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Vector Quantities
Quantities that have both a magnitude and direction. They are represented by an arrow, with the length representing the magnitude and the arrowhead representing the direction.
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Other cards in this set
Card 2
Front
Contact Force
Back
A force that acts on an object through physical contact.
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