Question
Explain why, a runner presses the ground with his feet before he starts his run.
✓
Answer
To start his run, a runner bends forward and pushes the ground with his feet in the backward direction. In turn ground exerts a reaction force on the runner in the forward direction which makes him run.
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
The nucleus of an atom has 5 protons and 6 neutrons. What would be the:
- Atomic number.
- Mass number.
- The number of electrons.
- The number of valence electrons, per atom of this element?
Name an Indian and a foreign breed of poultry.
Give reason for the following:
When a hanging carpet is beaten with a stick, the dust particles start coming out of it.
When a hanging carpet is beaten with a stick, the dust particles start coming out of it.
What valencies will be shown by the elements A, B, C, D and E having atomic numbers 2, 4, 8, 10, and 13 respectively.
Do action and reaction act on the same body or different bodies? How are they related in magnitude and direction? Are they simultaneous or not?
What is bilateral symmetry?
What is the chemical composition of cell wall in plants and fungi respectively?
In the figure below is shown the time-distance graph of cyclist.
Find out from the graph average speed in the whole journey.
Find out from the graph average speed in the whole journey.
What would you observe when:
A saturated solution of potassium chloride prepared at 60°C is allowed to cool to room temperature.
A saturated solution of potassium chloride prepared at 60°C is allowed to cool to room temperature.
Akhtar, Kiran and Rahul were riding in a motorcar that was moving with a high velocity on an expressway when an insect hit the windshield and got stuck on the windscreen. Akhtar and Kiran started pondering over the situation. Kiran suggested that the insect suffered a greater change in momentum as compared to the change in momentum of the motorcar (because the change in the velocity of the insect was much more than that of the motorcar). Akhtar said that since the motorcar was moving with a larger velocity, it exerted a larger force on the insect. And as a result the insect died. Rahul while putting an entirely new explanation said that both the motorcar and the insect experienced the same force and a change in their momentum. Comment on these suggestions.