Work, Energy & Power (Edexcel International A Level (IAL) Physics): Exam Questions

The diagram shows the momentum of two trolleys, X and Y, before a collision. The mass of each trolley is 0.25 kg.

The two trolleys join together after the collision and move on with a velocity of 1 m s⁻¹ .

Which of the following is the kinetic energy of trolley X before the collision?

A hydroelectric power station has an efficiency of 32%. In one hour the useful energy output of the power station is 1.2 × 10¹³ J.

Which of the following expressions gives the total power input to the power station in watts?

A tractor pulls a trailer a distance s in time t. The useful power output of the tractor is P.

Which of the following equations gives the force F of the tractor on the trailer?

An electric motor lifts a load of weight $50\text{ N}$ through a vertical height of $1.5\text{ m}$ in $4.0\text{ s}$. The motor is connected to a $12\text{ V}$ supply and draws a current of $2.0\text{ A}$.

Which of the following expressions gives the efficiency of the motor, as a percentage?

Which of the following pairs of quantities have the SI base units ${\text{kg m}}^2{\text{ s}}^{-2}$?

A sledge is pulled $25\text{m}$ along the ground by a rope inclined at an angle of $35°$ to the horizontal, as shown. The tension in the rope is $80\text{N}$.

Which of the following is the work done on the sledge?

A cyclist moving at speed $v$ has kinetic energy $E_k$ and momentum $p$.

The speed of the cyclist doubles.

Which row of the table gives the kinetic energy and the momentum of the cyclist at the new speed?