Unit 2: Mechanics, Materials and Waves

Define: scalar and vector quantities

Give an example of a scalar and a vector quantity

Define: displacement

Define: speed

Define: velocity

Define: acceleration

Define: equilibrium

Define: moment

Define: principle of moments

Define: couple

Define: centre of mass

Define: centre of gravity

What does the gradient of a displacement-time graph represent?

What does the gradient of a velocity-time graph represent?

What does the area under a velocity-time graph represent?

Why can horizontal motion and vertical motion be treated independently?

State Newton's 1st law

State Newton's 2nd Law

State Newton's 3rd Law

Describe one situation where Newton's 1st law applies

Describe how the forces acting on a falling object change as it falls

What is meant by conservation of energy?

Define: density

Define: tensile stress

Define: tensile strain

State Hooke's Law

What is meant by 'elastic limit'?

Define: Young Modulus

What does the area under a stress vs. strain graph represent?

What does the area under a force vs. extension graph represent?

What does the gradient of a stress vs. strain graph represent?

Which equation starts the derivation for the energy stored in a stretched material?

Define: Breaking Stress

Define: progressive wave

Define: stationary wave

Define: Transverse wave

Define: Longitudinal wave

What is the phase difference between particles one wavelength apart on a progressive wave?

What is the phase difference between particles half a wavelength apart on a stationary wave?

What is the phase difference between particles half a wavelength apart on a progressive wave?

What property of light waves does polarisation demonstrate?

If light refracts towards the normal what does this mean for the refractive indices of two materials?

If light refracts away from the normal what does this mean for the refractive indices of two materials?

State Snell's Law of Refraction