A LevelPhysicsEdexcelExam Questions2. MechanicsWork, Energy & Power

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

Exam code: 9PH0

31 mins8 questions

1 mark

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

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

$\frac{12 \times 2.0 \times 4.0}{50 \times 1.5} \times 100$
$\frac{50}{12 \times 2.0 \times 4.0} \times 100$
$\frac{50 \times 1.5}{12 \times 2.0 \times 4.0} \times 100$
$\frac{50 \times 1.5}{12 \times 2.0} \times 100$

Choose your answer

Was this exam question helpful?

1 mark

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?

	Kinetic energy	Momentum
A	$2 E_{k}$	$2 p$
B	$2 E_{k}$	$4 p$
C	$4 E_{k}$	$2 p$
D	$4 E_{k}$	$4 p$

Choose your answer

Was this exam question helpful?

A	force	power
B	moment of a force	work done
C	pressure	stress
D	impulse	momentum