answer these qustions
Answers
Answer:
PLEASE MARK ME AS THE BRAINLIEST.
Explanation:
Multiple choice question.
1.state of motion
2.friction
3.newton
4.b,c
5.reduce the air friction
6.lubricants
Q. Multiple Choice Questions :
1. A force does not change
(a) state of motion ✔︎
(b) direction of motion
(c) shape
(d) mass
➪A force does not change state of motion.
2.. A speeding car stops on applying brakes due to the action of
(a) force of gravity car
(b) weight of a
(c) friction ✔︎
(d) both (a) and (b)
➪ A speeding car stops on applying brakes due to the action of friction.
3. The SI unit of force is
(a) newton ✔︎
(b) joule
(c) kelvin
(d) fahrenheit
➪ The SI unit force is newton .
4. Select the only wrong statement about the force of friction.
(a) Force of friction comes into play when there is relative motion between two surfaces in contact.
(b) Force of friction increases on polishing the surfaces in contact. ✔︎
(c) Lubrication of machine part helps in minimising the friction. ✔︎
(d) Friction causes wear and tear in machinery parts
➪ (b) Force of friction increases on polishing the surfaces in contact. (c) Lubrication of machine part helps in minimising the friction.
5. Bodies of aircrafts are streamlined so as to
(a) increase the air friction
(b) reduce the air friction ✔︎
(c) make them attractive
(d) make them slimmer
➪ Bodies of aircrafts are streamlined so as to reduce the air friction.
6. Friction can be reduced by using
(a) lubricants ✔︎
(b) streamlined shape
(c) ball bearings
(d) all of them
➪ Friction can be reduced by using lubricants.