Calculating Acceleration of Loaded Cart – Friction & Weight Matter?

In summary, the question is whether the weight of a block on a cart affects the acceleration of the cart, given that the same force is being applied. It has been suggested that friction and the mass of the cart are being ignored in this scenario. The answer is that the mass of the load does matter and the size or number of wheels does not affect the acceleration. However, in real-life situations, friction cannot be ignored and would impact the acceleration of the cart.
  • #1
gyshalom
5
0

Homework Statement


suppose a block with mass m is being pulled by force f,the force of friction (first static then kinetic) will resist its motion.
now, take this block and put it on a cart with wheels and pull it with the same force,when calculating the acceleration of this loaded cart,is it just a matter of calculating rotational and translational motion of the wheels does the wheight of the block on the cart matter when it comes to how fast the cart will accelerate? or is it just the moment of inertia of the wheel itsel?:confused:


Homework Equations





The Attempt at a Solution

 
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  • #2
I'm confident that you can reason the answer to this question yourself.

As a guide, consider the following example:

When you're in a grocery store and you first get the shopping cart from up front, it's fairly easy to whip that thing in and out of aisles. Very soon; however, the cart begins to become more sluggish. Eventually, after piling in countless boxes of cereal, a gallon of milk, some steak, a lobster tail, chocolate chip cookies, nutri-grain bars, icecream, and that loaf of bread, you'll be doing good to make the turn down aisle 11 without knocking over the self-checkout registers. And if some tasty-looking treat catches your eye and you stop moving, may God be with you in getting that damn thing moving again. :wink:
gyshalom said:

Homework Statement


suppose a block with mass m is being pulled by force f,the force of friction (first static then kinetic) will resist its motion.
now, take this block and put it on a cart with wheels and pull it with the same force,when calculating the acceleration of this loaded cart,is it just a matter of calculating rotational and translational motion of the wheels does the wheight of the block on the cart matter when it comes to how fast the cart will accelerate? or is it just the moment of inertia of the wheel itsel?:confused:

Homework Equations


The Attempt at a Solution

 
Last edited:
  • #3
It sounds like friction is being ignored [as well as the mass of the cart]. In that case, you can do a straightforward F=ma calculation where acceleration is the only quantity not given.
 
  • #4
thanks guys...it makes sense, but here is my problem:in all the physics problems i saw, dealing with rotational and translational motion, only the acceleration of one wheel being pulled by a force was discussed; are there any physics problem that deal with the acceleration of a load carried by two wheels?(a wagon,cart what have you) how would the calculation differ? thanks very much for your help
 
  • #5
The mass of the load does matter. The wheel size, or number of wheels, does not matter [even if they are of different sizes]. All wheel surfaces accelerate at the same rate. RPM's are the only theoretical variable. In the real world [i.e., the world of engineering] the problem is more complex - mainly because friction cannot be ignored.
 

1. How do you calculate the acceleration of a loaded cart?

The acceleration of a loaded cart can be calculated by dividing the net force acting on the cart by its mass. The formula is a = F/m, where a is acceleration, F is the net force, and m is the mass of the cart.

2. Does friction affect the acceleration of a loaded cart?

Yes, friction does affect the acceleration of a loaded cart. Friction is a force that opposes motion, so it will act in the opposite direction of the applied force and reduce the acceleration of the cart.

3. How does weight affect the acceleration of a loaded cart?

Weight plays a role in determining the net force and therefore the acceleration of a loaded cart. The weight of the cart, along with any additional weight added to it, will contribute to the total downward force acting on the cart.

4. What is the difference between static and kinetic friction?

Static friction is the force that must be overcome to start an object's motion, while kinetic friction is the force that opposes the motion of a moving object. In the case of a loaded cart, static friction would affect the initial acceleration, while kinetic friction would affect the ongoing motion.

5. Is the acceleration of a loaded cart constant?

In an ideal scenario, where there is no friction or external forces acting on the cart, the acceleration would remain constant. However, in real-world situations, friction and other external forces can cause changes in the acceleration of a loaded cart.

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