Motion and forces — Foundational

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Level 1: Foundational

Identify, describe, state, calculate — recall facts and use standard relationships (typical early Year 10).

1. A net force of 80 N acts on a 20 kg object. Calculate the acceleration (use $a = F/m$).

   A)0.25 m/s²B)4 m/s²C)1600 m/s²D)60 m/s²

2. Newton’s first law is also called the law of:

   A)Action–reactionB)InertiaC)Universal gravitation onlyD)Conservation of mass only

3. In SI, force is measured in newtons (N), mass in kg, acceleration in:

   A)m/sB)kg·mC)m/s²D)J only

4. Newton’s third law states that forces between two interacting bodies are:

   A)Equal in magnitude, opposite in direction, same type, on different bodiesB)Always zeroC)Only on the same bodyD)Unrelated to motion

5. An object moves at constant velocity (straight line). The net force on the object is:

   A)Always equal to its weightB)Always increasingC)Always equal to air resistance onlyD)Zero in the ideal case where no net push/pull acts

6. Rearrange $F_{\text{net}} = ma$ to solve for mass:

   A)$m = F_{\text{net}} \times a$B)$m = \frac{F_{\text{net}}}{a}$C)$m = \frac{a}{F_{\text{net}}}$ onlyD)$m = F_{\text{net}} + a$

7. Newton’s second law relates net force, mass and:

   A)Speed onlyB)Distance onlyC)AccelerationD)Temperature

8. The unit of force in SI, the newton, is equivalent to:

   A)kg·m/sB)kg·m/s²C)kg·m²/sD)J·s only

9. If net force on an object is zero, its acceleration is:

   A)ZeroB)Always equal to gC)Always increasingD)Undefined without knowing mass

10. A free-body diagram shows forces acting on:

    A)Every object in the universe at onceB)Only the heaviest object in a sceneC)One chosen objectD)Only contact forces, never weight

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