6 Questions
What type of friction prevents motion between two surfaces?
Static friction
What does the gravitational force depend on?
Masses of the objects and the distance between them
Which force is exerted by a surface on an object perpendicular to the surface?
Normal force
What formula represents the electric force between two charged objects?
F_e = k \times (q1 \times q2) / r^2
Which factor does not affect the magnetic force on a moving charge?
Coefficient of friction
What does normal force depend on?
Mass of the object and acceleration due to gravity
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)
Learn about contact forces, including frictional force, normal force, and their relationships. Understand the types of frictional force, such as static and kinetic friction, and how they depend on normal force and coefficient of friction.
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