Physics Quiz on Shopping Centre Escalators and Aeroplanes

What equation links gravitational potential energy, mass, acceleration due to gravity, and height?

• E = mg + h
• E = mgh
• E = mg / h
• E = m / (gh)

What is the equation linking power, current, and voltage in an electrical circuit?

• P = IV
• P = I/V
• P = I^2R
• P = V^2/R

What is the kinetic energy equation?

• KE = 1/2mv^2
• KE = mv^2
• KE = mv
• KE = 1/2m^2v

What is the efficiency equation?

• Efficiency = Useful energy output / Total energy input
• Efficiency = Useful energy input / Total energy output
• Efficiency = (Useful energy output / Total energy input) x 100%
• Efficiency = (Total energy input / Useful energy output) x 100%

What is the equation linking work done, force, and distance moved?

• W = Fd
• W = F/d
• W = F^2d
• W = d/F

What is the useful energy transferred to the mass as it is lifted by the escalator?

• The useful energy is zero
• The useful energy is equal to the work done on the mass
• The useful energy is equal to the power of the escalator motor
• The useful energy is equal to the change in gravitational potential energy

What is the energy transformation that occurs in the electric motor powering the aeroplane?

• A) Chemical -> Electrical -> Kinetic
• B) Electrical -> Chemical -> Kinetic
• C) Electrical -> Kinetic -> Chemical
• D) Kinetic -> Chemical -> Electrical

What is the equation linking gravitational potential energy, mass, gravitational field strength (g), and height?

• GPE = mgh
• GPE = mg/h
• GPE = h/mg
• GPE = m/g × h

If a man of mass 78 kg is lifted to a height of 5.0 m, what is the gravitational potential energy gained?

• 3900 J
• 4000 J
• 39000 J
• 40000 J

What is the equation linking power, current, and voltage?

• P = IV
• P = I/V
• P = V/I
• P = I + V