| Exam Board | AQA |
|---|---|
| Module | Paper 2 (Paper 2) |
| Year | 2019 |
| Session | June |
| Marks | 5 |
| Paper | Download PDF ↗ |
| Mark scheme | Download PDF ↗ |
| Topic | Work done and energy |
| Type | Projectile energy - basic KE/PE calculation |
| Difficulty | Moderate -0.8 Part (a) is a standard derivation using either energy conservation or SUVAT equations that appears in every mechanics textbook. Part (b) requires substituting values and comparing to the theoretical result, then making a judgment—straightforward application with minimal problem-solving. This is easier than average A-level mechanics, being a routine 5-mark question testing basic understanding rather than any sophisticated reasoning. |
| Spec | 3.02h Motion under gravity: vector form6.02i Conservation of energy: mechanical energy principle6.02j Conservation with elastics: springs and strings |
| Answer | Marks |
|---|---|
| 13(a) | States appropriate suvat equation |
| Answer | Marks | Guidance |
|---|---|---|
| OE | 1.1a | M1 |
| Answer | Marks | Guidance |
|---|---|---|
| AG | 2.1 | R1 |
| Answer | Marks | Guidance |
|---|---|---|
| 13(b) | Substitutes two values in v = 2gh | |
| to find the third value OE | 3.1b | M1 |
| Answer | Marks | Guidance |
|---|---|---|
| If finding h then accept AWRT 20 | 1.1b | A1 |
| Answer | Marks | Guidance |
|---|---|---|
| matches the given value of v | 2.2b | R1 |
| Total | 5 | |
| Q | Marking Instructions | AO |
Question 13:
--- 13(a) ---
13(a) | States appropriate suvat equation
and clearly identifies
and
PI by v2 =02 +2gh
𝑠𝑠 = ℎ,𝑎𝑎 = 𝘨𝘨 𝑢𝑢 =0
OE | 1.1a | M1 | v2 =u2 +2as
u =0 a = g s=h
v2 =02 +2gh
v= 2gh
Completes rigorous argument by
substituting key values and
rearranging correctly for
Must have used consiste𝑣𝑣nt signs
for s and a
AG | 2.1 | R1
--- 13(b) ---
13(b) | Substitutes two values in v = 2gh
to find the third value OE | 3.1b | M1 | When and h = 18
𝘨𝘨 = 9.8
v = 2×9.8×18 = 18.8
18.8 < 20
Machine is faulty
Obtains correct third value
If finding v then accept AWRT 19
If finding g then accept AWRT 11
If finding h then accept AWRT 20 | 1.1b | A1
Makes an appropriate comparison
for correct v, g or h and infers that
the teacher’s claim is correct. The
comparison can be implied in their
comment, eg the value of v is less
than 20
or
Makes an appropriate comparison
using g = 10 and infers that the
teacher’s claim is incorrect. Their
answer must be rounded to 20.
The comparison can be implied in
their comment, eg the value
matches the given value of v | 2.2b | R1
Total | 5
Q | Marking Instructions | AO | Marks | Typical SolutionIn a school experiment, a particle, of mass $m$ kilograms, is released from rest at a point $h$ metres above the ground.
At the instant it reaches the ground, the particle has velocity $v \text{ m s}^{-1}$
\begin{enumerate}[label=(\alph*)]
\item Show that
$$v = \sqrt{2gh}$$ [2 marks]
\item A student correctly used $h = 18$ and measured $v$ as 20
The student's teacher claims that the machine measuring the velocity must have been faulty.
Determine if the teacher's claim is correct.
Fully justify your answer. [3 marks]
\end{enumerate}
\hfill \mbox{\textit{AQA Paper 2 2019 Q13 [5]}}