force-motion-simple-machines-l2 MCQ — 10 अभ्यास प्रश्न उत्तर सहित

Explanation

Speed equals distance divided by time. Imran’s distance is 600 metres and time is 120 seconds, so 600 divided by 120 gives 5 metre per second.

Explanation

The sharp pin concentrates the same effort on a smaller contact area, so pressure is greater and the clay mark is deeper. This is the same reasoning used for nails and sharp knives.

Explanation

Friction is the contact force that appears when one surface moves or tries to move over another. In Asha and Imran’s eraser activity, rougher cloth stops the eraser sooner because friction opposes the direction of motion.

Explanation

The note treats simple machines as bridge examples because the verified RBSE force-motion line does not separately name them. A pulley changing effort direction or a ramp spreading lifting over a path is enough for REET-level reasoning.

Explanation

This is a hard item because both parts must be judged and linked. Curiosity Grade 8 explains charged objects attracting paper pieces and classifies electrostatic force as non-contact, so the reason explains the assertion.