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

  • Thread starter kenjiro310
  • Start date
  • Tags
    Laws
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
1
0
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?
 
Physics news on Phys.org
  • #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.
 

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

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.

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.

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).

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.

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.

Similar threads

Newton's law problem: Pushing 2 stacked blocks on a horizontal table
Replies
13
Views
2K
Newton's Second Law (Pulley Sustem)
Replies
3
Views
1K
Static friction coefficient for a crate in the back of a truck
Replies
6
Views
2K
Application of Newton's second law to a horizontal pulley
Replies
2
Views
936
Friction problem of a block sandwiched between 2 surfaces
Replies
6
Views
567
Mechanical Physics: Coefficient of Friction
Replies
20
Views
2K
Calculating Force to Push Steel Rod Up 50 cm
Replies
24
Views
2K
Calculate the work done moving a crate
Replies
3
Views
2K
What is the acceleration of the crate?
Replies
12
Views
6K
Static Friction Required to Keep the System from Moving (Two Boxes)
Replies
16
Views
2K

Hot Threads

Recent Insights

Back
Top