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yKpoI14uk [10]
3 years ago
7

A) Give 3 examples of forces that are pulls and 3 examples that are pushes. b) For each example you give, state an approximate v

alue for the size of the force.
Physics
1 answer:
Stels [109]3 years ago
7 0

Answer:

Explanation:

Force is defined as the push or pull which changes or tries to change the position, state of motion and the shape of the object.

(A) The examples of push are:

To push a chair on the floor, to push the car when it is stopped due to some problem, to push book on the table.

The examples of pull are :

To pull a chair towards you, to pull a string in a game of top, to pull the string in a gym.

(B) To push a chair or a book, the force required is small as compared to the to push a car.

To pull a chair or the string of top is less than the force to pull the string in gym.

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The answer is 4 but idk how to get it so can somebody please explain how to get it
klemol [59]
How much gravitational potential energy does the block have
when it gets to the top of the ramp ?

      (weight) x (height) = (15 N) x (0.2 m)  =  3 Joules .

If there were no friction, you would only need to do 3 Joules of work
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But the question says you actually have to do 4 Joules of work
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Friction stole one of your Joules along the way.

Choice-4 is not the correct one.
Choice-1 is the correct one.

===========================

Notice that the mass of the block is NOT  15 kg , and you
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The formula for potential energy is  (m)·(g)·(h) .
But (m·g) is just the WEIGHT, and the formula
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The question GIVES us the weight of the block . . . 15 N .
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Pouvez vous m'aider dans ce devoir sil vous plait.​
ahrayia [7]

in english please

i don't understand actually

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