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GRAVITATIONAL FORCE AND FRICTION

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Objectives

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Introduction to Science

What is the force of gravity?

The force of gravity is a natural force by which bodies with mass attract each other.

https://web2.ph.utexas.edu/~coker2/index.files/freefall.htm

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Gravity depends on the distance

Think of gravity as a magnet. When the magnets are closer, the attraction is stronger; when the magnets are farther apart, the attraction is less.

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Examples of the Force of Gravity

To clarify the concept of the force of gravity, let's look at some examples.

• When it rains, water droplets fall and are attracted to the Earth's surface due to the force of gravity.

• Parachuting can be done thanks to the force of gravity, since the Earth attracts the person with a parachute to the ground with the force of gravity.

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Gravitational Force Formula

The image shows the formula for the force of gravity. Where:

• F = Force of gravity.
• G = Universal Gravitation Constant, is 6,674 · 10-11 N·m2/kg2.
• m1 is the mass of a body, expressed in kilograms.
• m2 is the mass of the other body, expressed in kilograms.
• d is the distance between the two bodies, expressed in meters.

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GRAVITATIONAL FORCE - Exercise

Problem: - A mass of 800 kg and another of 500 kg are separated by 3m, what is the gravitational force that the mass experiences?Solution: The situation of the problem is very simple to solve, since it is enough to take the data and replace it in the formula, we see that the masses are in kg, and the distance in meters, so there would be no need to convert to other units and the answer will be in Newtons.Now let's look at the replacement of the values and the solution on the right.

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Resolve the problem..

This is where you'll discover the wonders of our planet. From rocks and minerals to weather patterns and the water cycle, Earth science helps us understand the world we call home.

Calculate the magnitude of the gravitational force between two people, if one of them has a mass of 110 kg and the other 86 kg, if the distance between them is 1.3 meters.

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What is frictional force?

Friction force is a contact force that occurs when trying to move a body over the surface of another body. The examples of friction are countless. Friction is that force that prevents us from moving an old piece of furniture by pushing it with our forces. It is also the force that will stop and jump a flat stone that we throw sideways on the surface of the water.

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Frictional force characteristics

The frictional force only appears when one body is moved or attempted to move over another.The direction of frictional force is the opposite of movement.The frictional force does not depend on the speed at which the bodies slide.

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Conclusion

The gravitational force helps us understand the force of attraction that exists between two bodies, and not only that, but it also allows us to understand what happens with larger planets.

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Let's practice

A journey soon begin through Social Science experiences!

Let's practice

A journey soon begin through Social Science experiences!

Let's practice

A journey soon begin through Social Science experiences!

Let's practice

A journey soon begin through Social Science experiences!

Let's practice

https://issuu.com/edilbertoidrogo2016/docs/trabajo_de_potencia_mec__nica.pptx