Practise 18 real Federal Board questions on Turning Effect of Forces from 2023 to 2026. See the answer and explanation as soon as you answer.
Turning Effect of Forces is one of the 16 main chapters in our Federal Board Matric Physics question bank (9th class), and about 5% of its real questions come from it. Tayyari Karo has 18 real questions on this chapter from 2023 to 2026; 6 are multiple choice and marked instantly, and the rest are short and long questions with a model answer. By difficulty: 13 easy, 5 medium.
Work through the questions below, then open the explanation for each one. Redo the ones you missed a few days later.
These are real past-paper questions. Think of your answer first, then open the explanation.
If two unequal forces act parallel but in opposite directions, the forces are:
Answer: A. Unlike parallel forces
Parallel forces acting in opposite directions are called unlike parallel forces.
A spanner of length 30 cm uses a force of 150 N to open a tight nut. The torque is:
Answer: D. 45 Nm
τ = F × L = 150 × 0.30 = 45 N m.
An example of neutral equilibrium is:
Answer: D. Football
A ball on a horizontal surface stays in equilibrium in any new position — neutral equilibrium.
A force of 10 N is acting along x‑axis. What will be its horizontal component?
Answer: C. 10 N
Fx = F cos 0° = 10 × 1 = 10 N.
The first condition of equilibrium is:
Answer: A. ΣF = 0
First condition: the sum of all forces acting on a body is zero (ΣFx = 0 and ΣFy = 0). The second condition is Στ = 0.
If the x‑component and y‑component of a force are equal, the angle the force makes with the x‑axis is:
Answer: C. 45°
tan θ = Fy/Fx = 1, so θ = 45°.
A bicycle rider leans downward and widens the stance while turning. How do these actions help prevent the bicycle from falling? Explain briefly.
Leaning inward lowers the rider's centre of gravity and tilts it towards the centre of the turn, so that the line of action of the weight stays over the base (the wheels) and the combined force of the ground provides the centripetal force without producing a toppling torque. Widening the stance increases the area of the base of support. A lower centre of gravity and a broader base together make the rider more stable, so the bicycle does not overturn.
State conditions of equilibrium and also give their mathematical forms.
First condition: the vector sum of all forces acting on the body must be zero — ΣF = 0, i.e. ΣFx = 0 and ΣFy = 0. (No linear acceleration.)
Second condition: the sum of all torques (moments) acting on the body about any axis must be zero — Στ = 0, i.e. sum of clockwise torques = sum of anticlockwise torques. (No rotational acceleration.)
A body satisfying both conditions is in complete equilibrium.
| Session | Questions |
|---|---|
| 2026 Annual | 5 |
| 2025 1st Annual | 2 |
| 2024 Annual | 6 |
| 2023 Annual | 5 |
18 real Federal Board (FBISE) Physics questions on Turning Effect of Forces from 2023 to 2026, for 9th class. Each one shows the session it came from.
No. We could not find an official FBISE marking scheme for these papers, so the answers and explanations are written by Tayyari Karo for practice. Check anything important with your teacher or textbook.
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