Newton's third law, frictional force, acceleration

[furor celtica]

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)

 

[ehild]

Looks OK.

ehild

 

[furor celtica]

thanks