Grade 10 - Physics - LO.4 - Gravity, weight, and mass

    

We have in LO.4 Physics G10

First: the Concepts

A. Mass

B. Gravity

C. Gravitational field

D. Weight

E. General Law of Gravitation

F. Newton's Second Law in a gravitational field

G. Free Fall

H. Apparent weight

Second: the References

Active physics p 157– 173

Third: the Videos links

Fourth: Skills

A. Differentiate between mass and weight

B. Solve problems to determine the mass, weight and apparent weight in different physical situations

C. Apply the General Law of Gravitation to qualitatively rank the gravitational field of different planets (using only M/R^2)

D. Identify the action-reaction pairs that exist when an object close to earth experiences a force due to gravity (i.e. a weight)

Fifth: the materials as PPT., DOCX., and PDF

In the Drive from this link

Few Notes:

NEWTON'S SECOND LAW OF MOTION

Evidence for Newton's Second Law of Motion

In the Investigate, you observed that it was difficult to push on an object with a constant force because the object would move faster and faster. This observation that a constant force produces an acceleration is very important in physics.

You also found that if you pushed on a more massive object with the same force, it did not accelerate as much. This observation that the acceleration decreases with an increase in mass is also very important.

Based on observations from investigations similar to yours, Isaac Newton wrote his (Newton's) second law of motion: The acceleration of an object is directly proportional to the unbalanced force acting on it and is inversely proportional to the object's mass. The direction of the acceleration is the same as the direction of the unbalanced force. You saw the evidence for Newton's second law in the Investigate. When you pushed an object with a small force, the object had a small acceleration. The speed of the object increased, but not very quickly. 

When you pushed the object with a large force the object had a large acceleration. Newton's second law states this: "The acceleration of an object is directly proportional to the unbalanced force acting on it." This is a mathematical way of saying that the larger force produces a larger acceleration. As the force gets larger, the acceleration gets larger in a direct proportion. In this Investigate, the force was a push. 

You also found that the same force on a small mass-produced a larger acceleration than it did on a large mass. Newton's second law states this, "The acceleration of an object is... inversely proportional to the object's mass." This is a mathematical way of saying that the larger the mass, the smaller the acceleration. As the mass gets larger, the acceleration gets smaller in an inverse proportion. To achieve a big acceleration, you need to apply a large force to a small mass.

In one of the most important science books of all time, Principia, Isaac Newton wrote his second law of motion. It is interesting both historically and in terms of understanding physics to read Newton's second law in his own words: "The change in motion is proportional to the motive force impressed; and is made in the direction of the right line in which that force is impressed."

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