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34 Cards in this Set
- Front
- Back
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Random errors are... |
Errors of measurements in which the measured quantities differ from the mean value with different magnitudes and directions |
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Systematic errors are... |
Errors of measurements in which the measured quantities are displaced from the true value by fixed magnitude and in the same direction. |
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The accuracy is... |
Measure of how close the results of an experiment agree with the true value. |
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The precision is... |
Measure of how close the results of an experiment agree with each other. |
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Speed is... |
Rate of change of an object's distance traveled with respect to time. |
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Velocity is... |
Rate of change of an object's displacement with respect to time. |
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Acceleration is... |
Rate of change of an object's velocity with respect to time. |
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Hooke’s Law states... |
Within the limit of proportionality, the extension produced in a material is directly proportional to the load applied. |
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Normal contact force is... |
A force perpendicular to the surface experienced by a body when it is in physical contact with something else. |
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The principle of moments states... |
When an object is in equilibrium, the sum of anticlockwise moments about any point equals the sum of clockwise moments about the same point. |
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The moment of a force is... |
The product of the force and the perpendicular distance between the axis of rotation and the line of action of the force. |
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A couple is... |
A pair of forces, equal in magnitude but opposite in direction, whose lines of motion do not coincide. |
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The centre of gravity is... |
Is the point on an object through which the entire weight of the object may be considered to act. |
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Stability of an object refers to... |
Its ability to return to its original position after it has been displaced from that position. |
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Pressure is... |
The force acting per unit area. |
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Upthrust/buoyancy force is... |
An upward force on a body produced by the surrounding fluid (i.e., a liquid or a gas) in which it is fully or partially immersed, due to the pressure difference of the fluid between the top and bottom of the object. |
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Archimedes’ Principle states... |
That the upthrust experienced by an object partially or entirely immersed in a fluid is equal to the weight of the fluid displaced by the object. |
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Newton’s first law of motion states that... |
A body will continue in its state of rest or uniform motion in a straight line unless an external resultant force acts on it. |
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Newton’s second law of motion states that... |
The rate of change of momentum of a body is proportional to the resultant force acting on it and the change takes place in the direction of the force. |
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Newton’s third law of motion states that... |
If body A exerts a force on body B, then body B exerts a force of equal magnitude but in the opposite direction on body A. |
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The principal of conservation of momentum states that... |
The total momentum of a system of objects remains constant provided no resultant external force acts on the system. |
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Work is... |
The mechanical transfer of energy to a system or from a system by an external force on it. |
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Heat is... |
The non-mechanical transfer of energy from the environment to the system or from the system to the environment because of a temperature difference between the two. |
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The Principle of conservation of energy states that... |
Energy cannot be created nor destroyed in any process. |
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Gravitational Potential Energy is... |
The amount of work done in order to raise the body to the height h from a reference level. |
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Power is... |
The rate of work done or energy converted with respect to time. |
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The amplitude of a wave is... |
The maximum displacement of the particle from its equilibrium position. |
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The wavelength is... |
The distance between 2 successive points on a wave which are in phase with one another. |
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The period is... |
The time taken for a particle on the wave to complete one oscillation. |
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The frequency of a wave is... |
The number of complete oscillations that pass through a given point in 1 second. (Units: Hertz(Hz) or s-1) |
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Electric Current is... |
The rate of flow of charge through a particular cross sectional area with respect to time. |
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The potential difference between two points in an electrical circuit is... |
The electrical energy converted into other forms of energy per unit charge passing from one point to the other. |
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One volt is... |
The potential difference between two points in an electrical circuit when one joule of electrical energy is converted to other form of energy as one coulomb of charge passes from one point to the other. |
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Ohm’s Law states that... |
The ratio of the potential difference across a conductor to the current flowing through it, is a constant, provided that its physical conditions, such as temperature, remain constant. |
