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Questions and Answers
What is a resultant vector?
What is a resultant vector?
- A vector representing the sum of all other acting vectors (correct)
- A vector that has no effect on an object's motion
- A vector that only shows the direction of motion
- A vector that can only act in one direction
According to Newton's 1st law, what will happen to an object at rest?
According to Newton's 1st law, what will happen to an object at rest?
- It will remain at rest unless acted upon by an unbalanced force (correct)
- It will move unless a force pulls it
- It will eventually fall if not supported
- It will start moving due to gravitational forces
What does Newton's 2nd law state about acceleration?
What does Newton's 2nd law state about acceleration?
- Acceleration is directly proportional to the net force and inversely proportional to the mass (correct)
- Acceleration decreases as mass increases
- Acceleration is constant regardless of external forces
- Acceleration is independent of the net force
What does Coulomb's law describe?
What does Coulomb's law describe?
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What is Ohm's law used to describe?
What is Ohm's law used to describe?
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Study Notes
Resultant Vector
- The combined effect of multiple forces acting on an object
- Represents the single force that would have the same effect as all the individual forces
Normal Force
- Force exerted by a surface on an object in contact with it
- Always acts perpendicular to the surface
Newton's First Law of Motion
- Also known as the law of inertia
- An object at rest will stay at rest, and an object in motion will stay in motion at a constant velocity unless acted upon by an unbalanced force
Newton's Second Law of Motion
- Defines the relationship between force, mass, and acceleration
- Acceleration is directly proportional to the net force and inversely proportional to the mass
- Formula: F = ma (Force = mass x acceleration)
Newton's Law of Universal Gravitation
- Every object in the universe attracts every other object
- The force of attraction is directly proportional to the product of their masses and inversely proportional to the square of the distance between them
- Formula: F = G(m1m2)/r^2 (G is the gravitational constant, m1 and m2 are the masses of the objects, and r is the distance between them)
Coulomb's Law
- Describes the electrostatic force between two point charges
- Force is directly proportional to the product of the charges and inversely proportional to the square of the distance between them
- Formula: F = k(q1q2)/r^2 (k is Coulomb's constant, q1 and q2 are the charges, and r is the distance between them)
Faraday's Law of Electromagnetic Induction
- An electromotive force (EMF) is induced in a closed circuit when there is a change in magnetic flux through the circuit
- The induced EMF is directly proportional to the rate of change of magnetic flux
- Formula: EMF = -dΦ/dt (Φ is the magnetic flux and t is time)
Ohm's Law
- For a material at a constant temperature, the current flowing through a conductor is directly proportional to the potential difference across its ends
- Formula: V = IR (V is the voltage across the conductor, I is the current flowing through it, and R is the resistance)
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