Physics Concepts Quiz

Define: (a) Stress (b) Strain (c) Young modulus

State Hooke’s law and describe the condition under which it applies.

Explain the difference between elastic deformation and plastic deformation.

A wire of length 1.8 m and cross-sectional area 2.0 × 10 − 6 m 2 extends by 0.60 mm when subjected to a tensile force of 30 N. (a) Calculate the stress. (b) Calculate the strain. (c) Determine the Young modulus.

A student plots a stress–strain graph for copper. (a) Sketch the general shape of the graph. (b) Indicate the yield point and explain its significance. (c) Explain how the graph can be used to find the Young modulus.

Steel cables are used in lifts instead of copper wires. Using stress–strain concepts, explain why.

Why is it important to use a long, thin wire when measuring Young modulus experimentally?

Describe an experiment to determine the Young modulus of a wire.

Define: (a) Frequency (b) Wavelength (c) Wave speed (d) Time period

Write the wave equation relating speed, frequency, and wavelength.