Solving Newton's Laws: Friction & 10-kg Crate

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In summary, the conversation discusses a problem in physics involving a worker pulling a 10-kg crate on a rough floor with coefficients of static and kinetic friction of 0.5 and 0.3, respectively. The worker pulls with a force of 40 N and the question is to determine the frictional force exerted by the surface. The conversation ends with a request for steps or hints on how to solve the problem.
  • #1
kenjiro310
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Hi guys I am new with physics and having a hard time wraping my head around things.

A worker pulls horizontally on a rope that is attached to a 10-kg crate resting on a rough floor. The coefficients of static and kinetic friction are 0.5 and 0.3, respectively. The worker pulls with a force of 40 N. The frictional force exerted by the surface is

A) 40 N B) 50 N C) 10 N D) 100 N E) 30 N

I would like to know the steps or hints on how to solve this?
 
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  • #2
kenjiro310 said:
Hi guys I am new with physics and having a hard time wraping my head around things.

A worker pulls horizontally on a rope that is attached to a 10-kg crate resting on a rough floor. The coefficients of static and kinetic friction are 0.5 and 0.3, respectively. The worker pulls with a force of 40 N. The frictional force exerted by the surface is

A) 40 N B) 50 N C) 10 N D) 100 N E) 30 N

I would like to know the steps or hints on how to solve this?
We can't give you the steps without your attempt, but for starters, how do you calculate (what are the equations) static and kinetic friction forces? Please follow the template as you post. And welcome to PF!
 
  • #3
Ah sorry, new myself, sorry Phanthom.
 

1. What are Newton's Laws and how do they relate to friction in a 10-kg crate?

Newton's Laws are three fundamental principles of motion developed by Sir Isaac Newton. The first law states that an object at rest will stay at rest and an object in motion will stay in motion with a constant velocity unless acted upon by an external force. The second law states that the acceleration of an object is directly proportional to the net force acting on the object and inversely proportional to its mass. The third law states that for every action, there is an equal and opposite reaction. In the case of a 10-kg crate, these laws can be applied to understand the motion and friction involved.

2. How does friction affect the motion of a 10-kg crate?

Friction is a force that resists the relative motion between two surfaces in contact. In the case of a 10-kg crate, friction can either help or hinder its motion. For example, if the crate is being pushed along a surface, friction from the surface can help to slow down the crate and bring it to a stop. On the other hand, if the crate is being pulled along a surface, friction from the surface can help to increase its speed.

3. How can we calculate the amount of friction acting on a 10-kg crate?

The amount of friction acting on a 10-kg crate can be calculated using the equation Ff = μN, where Ff is the force of friction, μ is the coefficient of friction between the surfaces in contact, and N is the normal force exerted by the surface on the crate. The coefficient of friction depends on the materials of the crate and the surface it is in contact with. The normal force is equal to the weight of the crate, which in this case is 10 kg multiplied by the acceleration due to gravity (9.8 m/s^2).

4. How can we reduce the amount of friction acting on a 10-kg crate?

The amount of friction acting on a 10-kg crate can be reduced by using lubricants such as oil or grease between the surfaces in contact. This creates a thin layer between the surfaces, reducing the amount of friction. Another way to reduce friction is by using wheels or rollers instead of directly dragging the crate along a surface. This reduces the surface area in contact and thus reduces the friction.

5. Can the motion of a 10-kg crate be affected by factors other than friction?

Yes, the motion of a 10-kg crate can be affected by factors other than friction. These include the force applied to the crate, the surface it is on, and external forces such as air resistance. Additionally, the mass and shape of the crate can also affect its motion. These factors must also be considered when solving for the crate's motion using Newton's Laws.

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