Newton's third law, frictional force, acceleration

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The discussion focuses on analyzing the forces acting on two stacked crates in a truck that is accelerating on a horizontal road. For the upper crate, the forces include its weight downward, a normal force from the lower crate upward, and a forward frictional force from the lower crate. The lower crate experiences a backward frictional force from the upper crate, its weight downward, a normal force from the upper crate downward, and a normal force from the floor upward, along with a forward frictional force from the floor. The responses confirm that the force diagrams for both crates are correctly identified.
furor celtica
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Homework Statement


a truck driver loads two identical untethered crates stacked one upon the other. no sliding takes place. make separate sketches to show the forces acting on each crate when the truck is traveled on a horizontal straight road while accelerating.


Homework Equations





The Attempt at a Solution


ok so please i just want a 'correct' or 'incorrect' type answer here, no explanations please.

forces on upper crate:
weight (downwards), normal contact force exerted by lower crate (upwards), frictional force exerted by lower crate (forwards)
forces on lower crate:
frictional force exerted by upper crate (backwards), normal contact force exerted by upper crate (downwards), weight (downwards), normal contact force exerted by floor (upwards), frictional force exerted by floor (forwards)
 
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Looks OK.

ehild
 
thanks
 

Thread 'Magnitude of buoyant force in fluids of different densities'

The book claims the answer is that all the magnitudes are the same because "the gravitational force on the penguin is the same". I'm having trouble understanding this. I thought the buoyant force was equal to the weight of the fluid displaced. Weight depends on mass which depends on density. Therefore, due to the differing densities the buoyant force will be different in each case? Is this incorrect?
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