These questions belong to 'Class 8' Science.
Please answer these all questions :----
12,13,14,15,16,17 (All)
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Answers
refer to the above attachment :)
12.Tires - If there was less atmospheric pressure the pressure inside the tires would rise. Car engines - The lower the atmospheric pressure (as in a car going to higher elevations) the less power it can generate.
13.Blunt blades have larger area compared to the sharp-edged blades. Thus, the applied force produces a lower pressure in case of blunt blades, which makes it difficult to cut the cloth.
14.To make a chapatti from a ball of dough, we push the dough inward to reduce its thickness. So the forces applied are compressive forces.
15.The electrostatic force is an attractive and repulsive force between particles are caused due to their electric charges. The electric force between stationary charged body is conventionally known as the electrostatic force
16.Gravitational force is the attractive force exerted by the earth on all the objects in the universe. Example of gravitational force is when a ball is thrown upwards, it falls back on the ground because of gravitational force.
17.Friction is the force resisting the relative motion of solid surfaces, fluid layers, and material elements sliding against each other. There are several types of friction: Dry friction is a force that opposes the relative lateral motion of two solid surfaces in contact.