03. What is meant by electrostatic force?
04. What happens to the atmospheric pressure if the temperature is high?
05. Why caterpillar tracks are used in battle tanks instead of tyres?
06. Draw the path of a ray of light as it passes from air to glass?
07. Which force is responsible for wear and tear of machinery?
08. Which force helps the brake system to stop the vehicle?
09. Which one is greater, static friction or sliding friction?
Answers
Answer:
1) Electrostatic forces are non-contact forces; they pull or push on objects without touching them. Rubbing some materials together can result in something called 'charge' being moved from one surface to the other. Charged objects pull on other uncharged objects and may either push or pull on other charged objects.
2) If the temperature of the air increases, the atmospheric pressure must decrease in order to keep the density of the air constant. Thus, the
atmospheric pressure decreases due to increase in the air temperature.
3) If they used wheels, they would often get stuck. Therefore in order to spread their heavy weight on the ground, they use caterpillar tracks in place of tyres. Battle tanks use caterpillar tracks to spread their heavy weight on soft ground. This prevents the sinking of land under the weight of the tank .
4) the photo is answer of question 06.
5) Friction produces heat causing wastage of energy in machines. Friction causes wear and tear of moving parts of machinery, soles of shoes, etc.
6) Friction braking is the most commonly used braking method in modern vehicles. It involves the conversion of kinetic energy to thermal energy by applying friction to the moving parts of a system. The friction force resists motion and in turn generates heat, eventually bringing the velocity to zero.
7) Static friction is strongest, followed by sliding friction, and then rolling friction, which is weakest.
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Answer:
9. Static friction
Explanation:
THE TWO SLIDING OBJECTS FIND LESS TIME TO GET INTERLOCKED AGAINST EACH OTHER. SO THEY GET LESS FRICTION. THEREFORE STATIC FRICTION IS GREATER THAN SLIDING FRICTION.