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3 years ago

What are the principals behind Newtons first and third law?

Physics

1 answer:

koban [17]3 years ago

7 0

Answer:

First law: An object either remains at rest or continues to move at a constant velocity, unless acted upon by an external force. (i.e. Objects in motion tend to stay in motion. Objects at rest tend to stay at rest.)

Third law: When one body exerts a force on a second body, the second body simultaneously exerts a force equal in magnitude and opposite in direction on the first body.

Explanation:

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A rope horizontally pulls a massive object lying on a surface with friction with a constant

SVEN [57.7K]

Answer:

Equal to the frictional force

Explanation:

Question; The options given with regards to a similar question posted online are;

A. Equal (equivalent) to the frictional force

B. Larger than the frictional force

C. Equal to the object's weight

D. More than the object's weight

Explanation

According to Newton's first law of motion, every object shall remain at rest or continue moving with uniform (constant speed) motion unless there is a net force acting on the object

Given that the velocity of the massive block, lying on the surface that has friction, being pulled by the rope = Constant

Therefore;

The net force acting on the moving block while being pulled by the rope = 0

From which we have;

The pulling force = The resistive force

Where;

The pulling force = The (pulling) force (applied) on the rope

The resistive force = The frictional force of the surface which tends to prevent the motion of the block

Therefore, given that the net force acting on the block = 0

The force on the rope = The frictional force (of the surface)

The correct option is option A. Equal to the frictional force.

5 0

3 years ago

While out hiking, you and your buddy decide to have some fun with the rocks laying all around. While sitting on a high cliff, ov

Ulleksa [173]

When we drop the stone in air then during its motion in air the net force on the stone is due to gravity

so its net force is given as

$F = mg$

here we know that

$ma = mg$

so we have

$a = g$

now as soon as it will enter into the water then it will have resistive force due to water as well as buoyant force due to water on it in opposite direction

so the net force on the stone will decrease

so as soon as it will enter into the water the acceleration of stone will decrease due to which the rate of increase in speed of the stone will decrease as it will enter into the water

8 0

4 years ago

Can someone list 6 advantages of renewable energy.

igor_vitrenko [27]

Answer:

Solar energy, Wind energy, Hydro energy, Tidal energy, Geothermal energy, Biomass Energy.

Explanation:

I hope that it helps you...

4 0

3 years ago

A pole vaulter takes 1.3 seconds to fall from peak height to the landing mat. What is his vertical velocity at contact with the

julia-pushkina [17]

$12.75 \frac{m}{s}$

Assuming vertical acceleration of $9.81 \frac{m}{s^2}$ , the speed after x seconds of falling is $9.81x \to 9.81(1.3) = 12.75$

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3 years ago

Which group of animals would be served best by the following adaptations?

aev [14]

The answer to this question would be: A) animals that live in deserts

Desert temperature is high, especially in the day, An animal that lives in the desert needs to adapt to the high temperature either by reducing the heat or by increasing heat loss. By becoming nocturnal, the animal also able to evade the sunlight so it was less exposed to the heat.
Unlike other option, the desert is lacking water. Desert is mostly dry and water would be a resource that hard to find. In this case, kidneys adapted to check water loss would be a great help

5 0

3 years ago

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What are the principals behind Newtons first and third law?​

What are the principals behind Newtons first and third law?