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What is the difference between static and kinetic friction?
Static friction: Opposes the start of motion. Kinetic friction: Opposes motion between surfaces already in relative motion.
Differentiate between weight and normal force.
Weight: Force due to gravity acting on an object. Normal Force: Force exerted by a surface perpendicular to the contact area, counteracting the component of the weight perpendicular to the surface.
What is the effect of increasing the angle of an inclined plane on the component of weight acting down the plane?
Increasing the angle increases the component of weight acting down the plane ($mg\sin\theta$).
What happens when the net force on an object is zero?
The object is in equilibrium (either at rest or moving with constant velocity).
What is the effect of increasing the coefficient of friction between two surfaces?
It increases the frictional force between the surfaces, opposing motion.
What happens if you do not include all forces acting on an object in a free-body diagram?
The net force calculation will be incorrect, leading to an incorrect determination of acceleration.
What effect does increasing normal force have on friction force?
Increasing the normal force typically increases the friction force, as friction force is often proportional to the normal force.
What happens if the applied force is greater than the maximum static friction?
The object will begin to move, and the friction force will transition from static to kinetic friction.
What are the steps to create a free-body diagram?
1. Represent the object as a dot. 2. Draw vectors representing all forces acting on the object, starting from the dot. 3. Label each force vector with its magnitude and direction.
How do you choose an appropriate coordinate system for a free-body diagram?
1. Identify the direction of acceleration. 2. Align one axis of the coordinate system with the direction of acceleration.