1.Mechanics

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Physics

11th

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24 Terms

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Displacement
Distance moved in a given direction
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Instantaneous speed
Rate of change of distance
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Average speed
Rate of change of total distance
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Velocity
Rate of change in displacement
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Average velocity
Rate of change in net displacement
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Acceleration
Rate of change of velocity
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Moment of a force
Force x Perpendicular distance from the line of action of the force to the pivot
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Couple

A pair of forces that are equal in magnitude but opposite in direction and separated by a perpendicular distance

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Moment of a couple

Force × Perpendicular distance between the lines of action of the forces

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Centre of mass

The point in a body where the weight appears to act

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Principle of moments
For a body in equilibrium the sum of the clockwise moments if equal to the sum of the anticlockwise moments about a point
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Newtons first law

An object will remain stationary or moving at a constant velocity unless acted on by a resultant force

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Newtons second law
The rate of change of momentum of an object is proportional to the resultant force of the object and in the direction of the resultant force
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Newtons third law

When body A exerts a force on body B, body B exerts a equal and opposite force on body A of same type

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Inertia
Resistance to change in motion
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Momentum
Product of its mass and velocity
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Impulse
product of the force and the time for which the force exerts
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Principle of momentum

Within a closed system the total momentum in any direction remains constant

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Elastic collision
A collision in which the total kinetic energy is conserved
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Inelastic collision
A collision in which some or all of the kinetic energy is transferred to other forms
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Hooke’s law

The extension is proportional to the force applied provided the elastic limit is not exceeded

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Tensile stress

Tensile force per unit cross sectional area

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Tensile strain

Ratio of extension to its original length

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Young Modulus

Ratio of stress to strain which is constant for a material