Newton's third law, frictional force, acceleration

The forces on the upper crate include weight, normal contact force from the lower crate, and frictional force from the lower crate. The forces on the lower crate include frictional force from the upper crate, normal contact force from the upper crate, weight, normal contact force from the floor, and frictional force from the floor. The answer provided is deemed correct.
  • #1
furor celtica
69
0

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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  • #2
Looks OK.

ehild
 
  • #3
thanks
 

1. What is Newton's Third Law?

Newton's Third Law states that for every action, there is an equal and opposite reaction. This means that when one object exerts a force on another object, the second object will exert an equal and opposite force back on the first object.

2. How does frictional force affect motion?

Frictional force is a force that resists motion between two surfaces that are in contact. It acts in the opposite direction of the movement and can either slow down or prevent motion altogether. This is because the force of friction works against the force applied to move an object.

3. What factors affect the amount of frictional force?

The amount of frictional force between two surfaces depends on the type of surfaces, the force pushing the surfaces together, and the roughness of the surfaces. The rougher the surfaces and the greater the force pushing them together, the greater the frictional force will be.

4. How does acceleration relate to Newton's Third Law?

According to Newton's Third Law, every action has an equal and opposite reaction. This means that when an object exerts a force on another object, the second object will also exert an equal and opposite force back on the first object. This results in a change in motion, or acceleration, for both objects.

5. Can frictional force ever be beneficial?

Yes, frictional force can be beneficial in many ways. It allows us to walk, drive, and hold objects without them slipping out of our hands. Frictional force also helps to slow down or stop objects in motion, preventing accidents. In some cases, friction can even be used to generate heat or electricity.

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