All Flashcards
What are the differences between Normal Force and Buoyant Force?
Normal Force: Contact force exerted by a surface. | Buoyant Force: Upward force due to fluid displacement.
Compare the net force on an object floating versus an object sinking at terminal velocity.
Floating: Net force is zero (equilibrium). | Sinking at terminal velocity: Net force is also zero (constant velocity).
How does the buoyant force change when comparing a floating object to a sinking object?
Floating: Buoyant force equals the weight of the object. | Sinking: Buoyant force is less than the weight of the object.
Compare the forces acting on an object floating in water versus an object submerged and held in place.
Floating: Weight and Buoyant Force. | Submerged and held: Weight, Buoyant Force, and applied force.
Compare the effect of increasing the size of a sphere on terminal velocity, considering two scenarios: one where the sphere is made of the same material and one where the density remains the same.
Same Material: Terminal velocity increases due to increased weight. | Same Density: Terminal velocity increases, but to a lesser extent due to proportional increase in buoyant force.
What is Weight (W or Fg)?
The force of gravity acting on an object. Always points downwards.
What is Buoyant Force (Fb)?
The upward force exerted by a fluid on an object. Crucial for understanding floating and sinking.
What is Normal Force (N)?
A contact force exerted by a surface on an object. Only present when an object is resting on a surface.
What is Resistive Force (Fr)?
A force that opposes motion through a fluid. Increases with the object's velocity; often called drag force.
Define Free-Body Diagram (FBD).
A visual representation of all forces acting on an object.
What happens when the buoyant force equals the weight of an object?
The object floats or is in equilibrium within the fluid.
What happens when the weight of an object is greater than the buoyant force?
The object sinks.
What happens when an object reaches terminal velocity?
The net force on the object is zero, and its velocity becomes constant.
What is the effect of increasing an object's velocity in a fluid?
The resistive force (drag force) increases.
What is the effect of a non-zero net force on an object according to Newton's Second Law?
The object accelerates in the direction of the net force (ΣF = ma).