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4 years ago

If the acceleration of a system is zero, are no external forces acting on it? what about internal forces? explain your answers.

Physics

2 answers:

lukranit [14]4 years ago

8 0

Answer:

Yes

May not be zero

Explanation:

a) When a acceleration of a system = 0

F = m*a = 0

Hence,

All resultant external forces are zero

b) A system may consists of multiple masses or objects interacting with one another. Hence, those internal are non zero for the system to remain intact

E.g two boxes riding on one another moving at a constant speed.

Hence, a single object system has zero internal forces; however, a multiple objects system will have non zero internal forces

makvit [3.9K]4 years ago

7 0

It is not possible for an object to have no external/internal forces acting on it. To have an acceleration of 0, the forces acting on the object balance out, leading to the object remaining static.

Hope I helped :)

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Compare and contrast the energy transfer of a roller coaster to that of a pendulum

Softa [21]

When the pendulum and roller coaster move to the top, its has more potential energy whereas when comes to the bottom has more kinetic energy.

<h3>Compare and contrast the energy transfer of a roller coaster to that of a pendulum:</h3><h3>What is the transfer of energy in a roller coaster?</h3>

The transfer of potential energy to kinetic energy occur when the roller coaster move along the track. As the motor pulls the cars to the top, the body has more potential energy whereas when the body comes to the bottom , it has kinetic energy in the object.

<h3>What is the energy transfer in a pendulum?</h3>

As a pendulum swings, its potential energy changes to kinetic energy and kinetic energy changes into potential energy. At the top more potential energy is present.

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2 years ago

Which would you expect to freeze faster pure water or salt solution why?

krek1111 [17]

Pure water.

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3 years ago

The shifting of the observed wavelength of light due to the motion of the source toward or away from the observer is called the

alexdok [17]

Answer:

doppler effect

Explanation:

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When the relative motion of two bodies results in the wavelength becoming longer this means that the bodies are getting farther. This is known as red shift.

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3 years ago

Two identical objects, A and B, are sitting on a table. If the net force on object A is 5 N and the net force on object B is 10

sveta [45]

If the net force on object A is 5 N and the net force on object B is 10 N, then object B will accelerate more quickly than object A provided the mass of both objects are same.

Answer: Option C

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According to Newton’s second law of motion, any external force applied on an object is directly proportional to the mass and acceleration of the object. In order to state this law in terms of acceleration, it is stated that acceleration exhibited by any object is directly proportional to the net force applied on the object and inversely proportional to the mass of the object as shown below:

$\text {Acceleration of the object } \propto \frac{\text {Net force on the object}}{\text {Mass of the object}}$

So if two objects A and B are identical which means they have same mass, then the acceleration attained by the object will be directly proportionate to the net forces exerted on the objects only.

Thus if the force applied is more for one object, then the object will be exhibiting more acceleration compared to the other one. So as object B is experiencing a net force of 10 N which is greater than the net force experiences by object A, then the object B will be accelerating more quickly compared to the object A's acceleration.

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3 years ago

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