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Materials

What is density?

This is the mass per unit volume measured in kgm3

How do you measure the density of a regular solid?

This mass is measured using a top balance
The dimensions are measured using vernier callipers or a micrometer
The volume is calculated using 4/3 x pi…

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Tension = weight of load

What type of graph does a steel spring give?

This gives a straight line through the origin.

What type of graph does a rubber band give?

A rubber band at first extends easily when it is stretched, however when it becomes full stretched it is…

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What happens beyond the point P?

The line curves and continues beyond the elastic limit E to the yield point where the wire temporarily weakens.

What is the elastic limit?

This is the point beyond which the wire is permanently stretched and suffers plastic deformation.

What happens beyond y2?

A…

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What is strain energy?

This is the work done to deform an object (area under the line of a forceextension graph)

What is the strain energy for a metal wire/spring?

Provided the limit of proportionality is not exceeded, to stretch a wire to a certain extension the work done is…

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How can we locate the centre of mass of a metre rule?

We can do this by balancing it on a horizontal knife edge using a known weight whose position needs to be adjusted
gradually until the rule is exactly horizontal.

What is a couple?

This is a pair of…

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When one end of a slinky is moved back and forth repeatedly, each forward movement causes a compression wave to
pass along the slinky as the coils push into each other and each backward movement causes the coils to move apart so a
rare faction (expansion) wave passes along the…

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This is the number of cycles of vibration passing of a particle per second or the number of complete waves passing a point
per second.

What is wave speed?

C= f x lambda

What is phase difference?

This is the fraction of a cycle between the vibrations of two vibrating…

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These are waves that travel through a substance or through space if electromagnetic. These waves combine at fixed points
of no displacement (nodes) along the rope and at each node, the two sets of waves are always 180degrees (pi radians) out
of phase so they cancel each other out.

How…

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The amplitude of vibration is 0 at the nodes so there is no energy at the nodes and the amplitude of vibration is a maximum
at the antinodes so there is maximum energy at the antinodes. Since the nodes and antinodes are at fixed positions there
is no energy transferred…

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The crest reverses its phase when it reflects on the fixed end and travels back along the string as a trough. When it
reaches the vibrator it reflects and reverses again. It is travelling away from the vibrator as a crest. If this crest is reinforced
by a crest from…

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Miss Meera J

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First Glance - Very detailed!!!

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