Respuesta :
Answer:
a. -For example, when you go to the supermarket with your parents and they let you drive the cart. You step on the back and push off which lets you get far in the isle, but in a bit you start slowing down
and eventually stop at all.
b. -First, when a car is driving the wheels meet friction all the time, as that happens the wheels get a bit hot.
-Second, when you are cold you rub your hands together fast until they are warm.
c.-First, you wouldn't be able to land an airplane correctly and it would be very, very hard to stop it from moving, as well as the car .
-We wouldn't be able to ice skate, we wouldn’t be able to slow down and turn normally.
Explanation:
(a) Friction is the force that opposes the rubber tyre from sliding on the road surface. This friction avoids skidding of vehicles. Applications of breaks in the vehicle to stop it- Friction braking is the most widely used braking method in vehicles.
(b) When surfaces in contact move relative to each other, the friction between the two surfaces converts kinetic energy into thermal energy (that is, it converts work to heat). This property can have dramatic consequences, as illustrated by the use of friction created by rubbing pieces of wood together to start a fire.
(c)
- Walking. Without friction between the shoes and the ground, you cannot walk properly.
- Driving.
- Writing.
- Rubbing of Hands for Warmth.
- Skating.
- Lighting Matchsticks.
What is friction ?
"Force that resists the sliding or rolling of one solid object over another." Frictional forces, such as the traction needed to walk without slipping, may be beneficial, but they also present a great measure of opposition to motion.
What is kinetic energy ?
"Kinetic energy is a form of energy that an object or a particle has by reason of its motion." If work, which transfers energy, is done on an object by applying a net force, the object speeds up and thereby gains kinetic energy.
What is thermal energy ?
"Thermal energy refers to the energy contained within a system that is responsible for its temperature." Heat is the flow of thermal energy. A whole branch of physics, thermodynamics, deals with how heat is transferred between different systems and how work is done in the process.
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