All Flashcards
In a diagram of kinetic friction, label the forces acting on a block sliding to the right.
1: Applied Force (right), 2: Kinetic Friction (left), 3: Normal Force (up), 4: Weight (down)
In a diagram of static friction, label the forces acting on a stationary block with an applied force to the right.
1: Applied Force (right), 2: Static Friction (left), 3: Normal Force (up), 4: Weight (down)
Label the forces acting on a block sliding down an inclined plane with kinetic friction.
1: Weight (down), 2: Normal Force (perpendicular to plane), 3: Kinetic Friction (up the plane), 4: Component of Weight parallel to the plane (down the plane)
Label the forces acting on a block at rest on an inclined plane due to static friction.
1: Weight (down), 2: Normal Force (perpendicular to plane), 3: Static Friction (up the plane), 4: Component of Weight parallel to the plane (down the plane)
Label the forces on a free body diagram of an object being pushed horizontally with friction.
1: Applied Force (horizontal), 2: Friction Force (opposite applied force), 3: Normal Force (vertical), 4: Gravitational Force (vertical)
What is kinetic friction?
A force that opposes the motion of surfaces sliding against each other.
What is static friction?
A force that prevents surfaces from slipping when they are at rest relative to each other.
Define the coefficient of kinetic friction ().
An empirical value that depends on the materials of the contacting surfaces, used to calculate kinetic friction.
Define the coefficient of static friction ().
An empirical value that depends on the materials of the contacting surfaces, used to calculate the maximum static friction force.
Define normal force (N).
The force acting perpendicular to the surface of contact.
Define kinetic friction.
The force that opposes the motion of two surfaces sliding against each other.
Define static friction.
The force that opposes the start of motion between two surfaces in contact.
Define the coefficient of kinetic friction ().
A dimensionless quantity representing the 'roughness' between two surfaces in kinetic friction. It relates the kinetic friction force to the normal force.
Define the coefficient of static friction ().
A dimensionless quantity representing the 'stickiness' between two surfaces in static friction. It relates the maximum static friction force to the normal force.
Define normal force ().
The force exerted by a surface that is supporting the weight of an object. It acts perpendicular to the surface.