Physics Class: Hook's Law and Surface Tension

What does stress measure in a material?

What is the formula for calculating strain?

What indicates that Hook's Law is verified during an experiment?

Which factor does NOT affect surface tension?

How does temperature generally affect surface tension?

What is surface tension primarily the result of?

What does the drop weight method measure?

What does a straight line graph indicate in the context of Hook's Law?

Which of the following compounds lowers the surface tension of a liquid?

What is the range for drop radius in the drop weight method as stated?

Verifying Hook's Law

Stress is the force acting on an object, per unit cross-sectional area (F/A)
Strain is the change in length per unit length (ΔL/L₀)
Stress is directly proportional to strain, as shown by the equation Stress = E * Strain, where E is Young's modulus.
Hook's Law is verified when a graph of stress vs strain is a straight line, as it indicates a direct proportionality.
Extension of a spring is directly proportional to the tension (force) applied.

Determination of Surface Tension (Drop Weight Method)

Surface tension is the unbalanced force acting on the free surface of a liquid, resisting increases in surface area.
Surface tension decreases with rising temperature and is reduced by impurities.
Surface tension is measured by balancing the weight of a drop with the force due to surface tension within the liquid (using a formula like Mg=3.8ry)

Determination of Bending's Modulus

Bending's modulus (or flexural modulus) is a material property describing how it resists bending.
The formula for calculating Bending's modulus (Δη) is given as Δη = (gL³)/(4bd³E_B)

Determination of Speed of Sound in Air

Sound is a longitudinal wave.
It is longitudinal, meaning particle motion is parallel to the direction of wave propagation. This consists of compressions and expansions or relaxations in the medium.
Standing sound waves show nodes and antinodes.
Speed of sound depends on the factors like medium temperature and pressure

This quiz explores fundamental principles of Hook's Law, surface tension, and bending modulus in physics. It covers the relationships between stress and strain and the methods used to determine surface tension through the drop weight method. Test your understanding of these critical concepts in material science and mechanics.