Motion Force and Laws of Motion (Class 9)

What this worksheet covers

This is an eighteen-question practice worksheet on motion, force and laws of motion for Class 9, written to the pattern of the SOF National Science Olympiad (NSO). It carries 24 marks and is designed to be attempted in 45 minutes, split across three sections — Scientific Reasoning, Applying What You Know and Achievers Section. Every question is multiple choice with exactly one correct option, and every one comes with a fully worked solution rather than just an answer key — so a child who gets one wrong can see where the reasoning went astray instead of only learning that it did.

Skills your child practises

• Applied problem-solving on motion, force and laws of motion at Class 9 level
• Working accurately against a time limit, as the real paper demands
• Scientific Reasoning questions in the olympiad format
• Applying What You Know questions in the olympiad format
• Achievers Section questions in the olympiad format
• Reading worked solutions to find the step that went wrong

How to use it

1. 1There are 18 questions in this worksheet. All questions are compulsory.
2. 2Each question has four options (A), (B), (C) and (D). Exactly one option is correct.
3. 3Questions 1–15 carry 1 mark each. Questions 16–18 (Achievers Section) carry 3 marks each.
4. 4There is no negative marking. Study every graph and table carefully.

Sample questions from this worksheet

A preview of what's inside Motion Force and Laws of Motion (Class 9) — the PDF has the full set, and every question comes with a worked solution like these.

1. 1. The SI unit of acceleration is _______.

   • Am/s
   • Bm/s²correct
   • Ckm/h
   • DN
   Solution: Acceleration is the change in velocity per unit time, so its unit is (m/s) ÷ s = m/s². The unit m/s belongs to velocity and N to force.

2. 2. A car starting from rest reaches a speed of 20 m/s in 5 seconds. Its acceleration is _______.

   • A2 m/s²
   • B100 m/s²
   • C5 m/s²
   • D4 m/s²correct
   Solution: Acceleration a = {v − u/t} = (20 − 0) ÷ 5 = 4 m/s².

3. 3. Assertion (A): Passengers in a bus lurch forward when the driver brakes suddenly.Reason (R): The lower part of a passenger’s body stops with the bus while the upper part tends to stay in motion.

   • ABoth A and R are true and R is the correct explanation of Acorrect
   • BBoth A and R are true but R is not the correct explanation of A
   • CA is true but R is false
   • DA is false but R is true
   Solution: Braking applies a backward force through the floor and seat to the lower body, but no such force acts directly on the upper body, which keeps moving forward because of its inertia of motion. Both statements are true and the second is exactly why the lurch happens, so R explains A.