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Questions and Answers
What type of friction prevents motion between two surfaces?
What type of friction prevents motion between two surfaces?
- Static friction (correct)
- Electric friction
- Gravitational friction
- Kinetic friction
What does the gravitational force depend on?
What does the gravitational force depend on?
- Charges and the distance between them
- Normal force and coefficient of friction
- Magnetic field strength and velocity of the moving charge
- Masses of the objects and the distance between them (correct)
Which force is exerted by a surface on an object perpendicular to the surface?
Which force is exerted by a surface on an object perpendicular to the surface?
- Electric force
- Gravitational force
- Normal force (correct)
- Magnetic force
What formula represents the electric force between two charged objects?
What formula represents the electric force between two charged objects?
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Which factor does not affect the magnetic force on a moving charge?
Which factor does not affect the magnetic force on a moving charge?
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What does normal force depend on?
What does normal force depend on?
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Study Notes
Contact Forces
- Frictional Force: opposes motion between two surfaces in contact
- Types:
- Static Friction: prevents motion between two surfaces
- Kinetic Friction: opposes motion between two surfaces already in motion
- Depends on:
- Normal Force ( Fn )
- Coefficient of Friction ( μ )
- Formula: F_f = μ * Fn
- Types:
- Normal Force (Fn): force exerted by a surface on an object perpendicular to the surface
- Depends on:
- Mass of the object
- Acceleration due to gravity (g)
- Formula: Fn = mg
- Depends on:
Field Forces
- Gravitational Force: attractive force between two objects with mass
- Depends on:
- Masses of the objects (m1, m2)
- Distance between the centers of the objects (r)
- Formula: F_g = G * (m1 * m2) / r^2
- Depends on:
- Electric Force: force between two charged objects
- Depends on:
- Charges (q1, q2)
- Distance between the centers of the charges (r)
- Formula: F_e = k * (q1 * q2) / r^2
- Depends on:
- Magnetic Force: force between two magnets or a magnet and a current-carrying wire
- Depends on:
- Magnetic field strength (B)
- Velocity of the moving charge (v)
- Angle between the magnetic field and the velocity vector (θ)
- Formula: F_m = q * v * B * sin(θ)
- Depends on:
Contact Forces
- Frictional Force: opposes motion between two surfaces in contact, dependent on Normal Force (Fn) and Coefficient of Friction (μ)
- Types of Frictional Force:
- Static Friction: prevents motion between two surfaces
- Kinetic Friction: opposes motion between two surfaces already in motion
- Frictional Force Formula: F_f = μ * Fn
- Normal Force (Fn): force exerted by a surface on an object perpendicular to the surface, dependent on mass of the object and acceleration due to gravity (g)
- Normal Force Formula: Fn = mg
Field Forces
- Gravitational Force: attractive force between two objects with mass, dependent on masses of the objects (m1, m2) and distance between the centers of the objects (r)
- Gravitational Force Formula: F_g = G * (m1 * m2) / r^2
- Electric Force: force between two charged objects, dependent on charges (q1, q2) and distance between the centers of the charges (r)
- Electric Force Formula: F_e = k * (q1 * q2) / r^2
- Magnetic Force: force between two magnets or a magnet and a current-carrying wire, dependent on magnetic field strength (B), velocity of the moving charge (v), and angle between the magnetic field and the velocity vector (θ)
- Magnetic Force Formula: F_m = q * v * B * sin(θ)
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