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3 years ago

What is thE Rquation fo calculating the electrical force between two charges?

2 answers:

8 0

The direction of the electrical force is dependent upon whether the charged objects are charged with like charge or opposite charge and upon their spatial orientation. By knowing the type of charge on the two objects, the direction of the force on either one of them can be determined with a little reasoning.

umka21 [38]3 years ago

4 0

The equation for calculating the electrical force between the two charges is given by Coulomb's law

F=\frac{k q1 q2}{r^{2}}

K=constant= 9 x 10⁹ N m²/C²

q1= charge on first particle

q2= charge on second particle

r= distance between the two charges

Greater is the magnitude of the charges, greater will be the force between the two charges. The force is inversely proportional to the square of the distance between the charges.

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3 years ago

A 1-kg book is at rest on a desk. Determine the force the desk exerts on the book<br>

Katena32 [7]

<h3>Answer:</h3>

$\displaystyle F_n = 9.8 \ N$

<h3>General Formulas and Concepts:</h3>

<u>Pre-Algebra</u>

Order of Operations: BPEMDAS

Brackets
Parenthesis
Exponents
Multiplication
Division
Addition
Subtraction

Left to Right

<u>Physics</u>

<u>Forces</u>

SI Unit: Newtons N

Free Body Diagrams

Gravitational Force: $\displaystyle F_g = mg$

m is mass (in kg)
g is Earth's gravity (<em>9.8 m/s²</em>)

Normal Force: $\displaystyle F_n$

Newton's Law of Motions

Newton's 1st Law of Motion: An object at rest remains at rest and an object in motion stays in motion
Newton's 2nd Law of Motion: F = ma (Force is equal to [constant] mass times acceleration)
Newton's 3rd Law of Motion: For every action, there is an equal and opposite reaction

<h3>Explanation:</h3>

<u>Step 1: Define</u>

1 kg book at <em>rest</em>

<em>See Attachment</em>

<em>Draw a free body diagram to label the forces acting upon the book. We see that we would have gravitational force from Earth pointing downwards and normal force from the surface of the desk pointing upwards.</em>

<em>Since the book is not moving, we know that ∑F = 0 (sum of forces equal to 0).</em>

<u>Step 4: Find Normal Force</u>

Define Forces [Newton's Law of Motions]: $\displaystyle \sum F = 0$
[Newton's Law of Motions] Substitute in forces: $\displaystyle F_g - F_n = 0$
[Newton's Law of Motions] [Addition Property of Equality] Isolate $\displaystyle F_n$ : $\displaystyle F_g = F_n$
[Newton's Law of Motions] Substitute in $\displaystyle F_g$ : $\displaystyle mg = F_n$
[Newton's Law of Motions] Rewrite: $\displaystyle F_n = mg$
[Newton's Law of Motions] Substitute in variables: $\displaystyle F_n = (1 \ kg)(9.8 \ \frac{m}{s^2})$
[Newton's Law of Motions] Multiply: $\displaystyle F_n = 9.8 \ N$

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3 years ago

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JulsSmile [24]

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Explanation:

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Svetllana [295]

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