Struggling with Physics Homework: Who Can Explain Force and Motion Problems?

  • Thread starter Thread starter tinab16
  • Start date Start date
Click For Summary

Homework Help Overview

The discussion revolves around force and motion problems, specifically involving friction, acceleration, and forces acting on objects in various scenarios. The original poster presents multiple physics problems related to these concepts, seeking assistance in solving them.

Discussion Character

  • Exploratory, Conceptual clarification, Problem interpretation

Approaches and Questions Raised

  • Participants discuss the importance of understanding Newton's laws and the role of friction in the problems presented. Some suggest breaking down the questions into smaller parts and drawing diagrams to visualize the scenarios. There are inquiries about the relevant equations and concepts that could aid in solving the problems.

Discussion Status

Participants are engaging in a constructive dialogue, with some offering guidance on how to approach the problems without providing direct solutions. There is an emphasis on the need for the original poster to demonstrate effort and understanding before receiving further assistance.

Contextual Notes

The original poster has presented multiple questions at once, which some participants suggest may be overwhelming. There is a focus on the need for clarity in the problem setup and the application of relevant physics principles.

tinab16
Messages
3
Reaction score
0
I don't know how to solve this force and motion problems so I'm asking you for help...if someone knows how to solve them,I would like some solutions.
thanks!

1.a horizontal force of 12N pushes a 0.50 kg book against a vertical wall.the book is initially at rest.if coefficient of static friction is 0.6 and of kinetic friction is 0.8 what is the acceleration of the book?

2.a horizontal force of 5N pushes a 0.50kg block against a vertical wall.the block is initially at rest.if coefficient of static friction is 0.6 and of kinetic friction is 0.8 what is the acceleration of the block?

3.a 12kg crate rests on a horizontal surface and a boy pulls on it with a force that is 30° below the horizontal.if the coefficient of static friction is 0.40,the minimum magnitude force he needs to start the crate moving is?

4.a crate resting on arough horizontal floor is to be moved horizontally.the coefficient of static friction is 0.40.to start the crate moving with the weakest possible applied force,in what direction should the force be applied?

5.a 40N crate rests on a rough horizontal floor.a 12N horizontal force is the applied to it.if the coefficient of static friction is 0.5 and of kinetic is 0.4,the magnitude of the frictional force on the crate is?

6.a block slides down a frictionless plane that makes an angle of 30° with the horizontal.the acceleration of the block is?

7.a 25N crate slides down a frictionless incline that is 25° above the horizontal.the magnitude of the normal force of the incline on the crate is?

8.a 25N crate is held at rest on a frictionless incline by a force that is parallel to the incline.if the incline is 25° above the horizontal what is the magnitude of the applied force?

9.a 25N crate is held at rest on a frictionless incline by a force that is parallel to the incline.if the incline is 25° above the horizontal what is the magnitude of the normal force of the incline on the crate?

10.a 32N force,parallel to the incline is required to push a certain crate at constant velocity up a frictionless incline that is 30° above the horizontal.what is the mass of the crate?
 
Physics news on Phys.org
Nobody is going to do your homework for you. They will assist you, but only once you have shown that you have made an effort.
 
you don't have to solve the problems then but can you just give me the formulae?
and I will see what I can do.
thanks a lot.
 
Hello tinab16 and welcome to PF!

In future, I suggest you break this down and start with one question at a time when asking for help :smile:

Having said that, something that may help you would be to draw a diagram of the problem.

An equation you may find useful is

f_k=\mu_kF_N

Hope that helps. :wink:
 
lol the idea is to HELP you get the solution, not GIVE you the solution. Let's start with Newton's laws. The first question mentions force, mass, acceleration, friction... does that ring any bells!?
 
phyzmatix said:
Hello tinab16 and welcome to PF!

In future, I suggest you break this down and start with one question at a time when asking for help :smile:

Having said that, something that may help you would be to draw a diagram of the problem.

An equation you may find useful is

f_k=\mu_kF_N

Hope that helps. :wink:


OK.I'll see what I can do with it.
tnx.
 

Similar threads

Direction of a rope with a ball inside an accelerating box
  • · Replies 5 ·
Replies
5
Views
2K
What Is the Coefficient of Kinetic Friction Between the Ramp and the Crate?
  • · Replies 6 ·
Replies
6
Views
2K
Help with finding Normal Force of inclined plane
  • · Replies 1 ·
Replies
1
Views
3K
Calculating Coefficient of Friction for a Crate on an Inclined Surface
  • · Replies 2 ·
Replies
2
Views
3K
How can we model a rolling truck on an incline using rotational motion analysis?
  • · Replies 24 ·
Replies
24
Views
3K
Friction Problem of a Crate Sliding Down a Ramp
  • · Replies 4 ·
Replies
4
Views
4K
Newton's law problem: Pushing 2 stacked blocks on a horizontal table
  • · Replies 13 ·
Replies
13
Views
3K
Work done by the force of a man on a crate of 80N
  • · Replies 14 ·
Replies
14
Views
6K
Find the Coefficient of Kinetic Friction for Crate Movement
  • · Replies 2 ·
Replies
2
Views
2K
Finding the force to pull a block up a frictionless slope?
  • · Replies 12 ·
Replies
12
Views
3K