| Exam Board | OCR MEI |
|---|---|
| Module | M1 (Mechanics 1) |
| Marks | 3 |
| Paper | Download PDF ↗ |
| Mark scheme | Download PDF ↗ |
| Topic | Newton's laws and connected particles |
| Type | Lift with passenger or load |
| Difficulty | Easy -1.2 This is a straightforward force diagram question requiring identification of weight, normal reaction from below, normal reaction from above, and possibly friction forces on a single block in equilibrium. It tests basic understanding of Newton's laws with no calculation or problem-solving required—purely recall and application of standard force identification. |
| Spec | 3.03f Weight: W=mg3.03i Normal reaction force |
| Answer | Marks | Guidance |
|---|---|---|
| Answer | Marks | Guidance |
| \(16g \uparrow\) | B1 | One mark for each force with correct magnitude and direction. Deduct 1 mark only for \(g\) missing. |
| \(7g \downarrow\) | B | |
| \(9g \downarrow\) | B | |
| [3] | If all three forces are correct but there is at least one extra force, deduct 1 mark and give 2 marks. Otherwise ignore extra forces. Note: For \(16g \uparrow\) \(16g \downarrow\) Award B1 B0 B0 |
## Question 2:
| Answer | Marks | Guidance |
|--------|-------|----------|
| $16g \uparrow$ | B1 | One mark for each force with correct magnitude and direction. Deduct 1 mark only for $g$ missing. |
| $7g \downarrow$ | B | |
| $9g \downarrow$ | B | |
| [3] | | If all three forces are correct but there is at least one extra force, deduct 1 mark and give 2 marks. Otherwise ignore extra forces. Note: For $16g \uparrow$ $16g \downarrow$ Award B1 B0 B0 |
---2 Fig. 1 shows a pile of four uniform blocks in equilibrium on a horizontal table. Their masses, as shown, are $4 \mathrm {~kg} , 5 \mathrm {~kg} , 7 \mathrm {~kg}$ and 10 kg .
\begin{figure}[h]
\begin{center}
\includegraphics[alt={},max width=\textwidth]{82f933a6-c17e-4b41-ae2b-3cc9d0ba975c-1_405_573_1560_777}
\captionsetup{labelformat=empty}
\caption{Fig. 1}
\end{center}
\end{figure}
Mark on the diagram the magnitude and direction of each of the forces acting on the 7 kg block.
\hfill \mbox{\textit{OCR MEI M1 Q2 [3]}}