Question

Please answer these questions quickly. It is very urgent​

Answer 1

Answer:

1.  ≡ Disadvantages of Friction:

↔ Friction produces unnecessary heat leading to the wastage of energy.

↔ The force of friction acts in the opposite direction of motion, so friction slows down the motion of moving objects.

≡ Advantages of Friction:

↔ Friction is responsible for many types of motion

↔ It helps us walk on the ground .

Δ  I don't know 2 nd & 3rd sorry

4 . Simple machines are useful because they reduce effort or extend the ability of people to perform tasks beyond their normal capabilities. Simple machines that are widely used include the wheel and axle, pulley, inclined plane, screw, wedge and lever.