Newton's third law, frictional force, acceleration

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SUMMARY

The discussion centers on analyzing the forces acting on two identical crates stacked on top of each other in a truck while it accelerates on a horizontal road. The forces identified for the upper crate include its weight acting downwards, a normal contact force from the lower crate acting upwards, and a forward frictional force from the lower crate. For the lower crate, the forces include a backward frictional force from the upper crate, its weight acting downwards, a normal contact force from the upper crate acting downwards, a normal contact force from the floor acting upwards, and a forward frictional force from the floor. The analysis is confirmed as correct by the participant "ehild."

PREREQUISITES
  • Understanding of Newton's laws of motion
  • Knowledge of frictional forces and their direction
  • Familiarity with free body diagrams
  • Basic principles of acceleration in physics
NEXT STEPS
  • Study free body diagram techniques for complex systems
  • Explore the implications of frictional force in different materials
  • Learn about the effects of acceleration on multi-body systems
  • Investigate real-world applications of Newton's third law in vehicle dynamics
USEFUL FOR

Students studying physics, educators teaching mechanics, and anyone interested in understanding the dynamics of forces in accelerating systems.

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
 

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