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3 years ago

Define newton's first law and provide an example

Physics

2 answers:

il63 [147K]3 years ago

8 0

Answer:

Newton's first law states all objects have inertia, or resistance to change motion. Example: the car that breaks abruptly.

Lynna [10]3 years ago

6 0

Answer:

An object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force.

Explanation:

When an athlete tries to stop his career, it takes several meters to stop completely, due to the inertia produced.

When trying to push a car, at first it is very difficult, because, due to inertia, the car tends to remain still. But once it is put into motion, the effort is much less to be done, since then inertia causes it to keep moving.

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A train starts from rest and accelerates uniformly, until it has traveled 5.6 km and acquired a velocity of 42 m/s. The train th

Rasek [7]

Answer:

0.1575 m/s^2

Explanation:

Solution:-

- Acceleration ( a ) is expressed as the rate of change of velocity ( v ).

- We are given that the trains starts from rest i.e the initial velocity ( vo ) is equal to 0. Then the train travels from reference point ( so = 0 ) to ( sf = 5.6 km ) from the reference.

- During the travel the train accelerated uniformly to a speed of ( vf =42 m/s ).

- We will employ the use of 3rd kinematic equation of motion valid for constant acceleration ( a ) as follows:

$v_f^2 = v_i^2 + 2*a*( s_f - s_o )$

- We will plug in the given parameters in the equation of motion given above:

$42^2 = 0^2 + 2*a* ( 5600 - 0 )\\\\1764 = 11,200*a\\\\a = \frac{1,764}{11,200} \\\\a = 0.1575 \frac{m}{s^2}$

Answer: the acceleration during the first 5.6 km of travel is 0.1575 m / s^2

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3 years ago

Define newton's first law and provide an example​

Define newton's first law and provide an example