Newtons second law force problem

Click For Summary

Homework Help Overview

The discussion revolves around two physics problems: one involving Newton's second law related to a block being pushed at an angle, and the other concerning the acceleration of a child on a merry-go-round. Both problems require an understanding of forces and circular motion.

Discussion Character

  • Mixed

Approaches and Questions Raised

  • Participants explore the application of Newton's second law for the first problem, with one attempting to set up the equation for the normal force. For the second problem, there is a focus on the relationship between circular motion and acceleration, with questions about the relevance of mass and the formulas needed to find acceleration.

Discussion Status

The discussion is active, with participants sharing their thoughts on the problems. Some guidance has been offered regarding the second problem, particularly about calculating speed and acceleration in circular motion. There is an acknowledgment of different approaches being considered without a clear consensus yet.

Contextual Notes

One participant notes the absence of prior work shown by the original poster, which may affect the clarity of the discussion. There is also a mention of the child's mass being potentially irrelevant in the context of the second problem.

pringless
Messages
43
Reaction score
0
A 69 kg block is pushed along the celing with a constant applied force of 1300N that acts at an angle of 56 degrees with the horzontal. The block accelerates to the right at 8m/s^2. What is the magnitude of the normal force the ceiling exerts on the block? Answer in units of N.

and

A merry-go-round makes one complete revolution in 16s. A 19.7kg child sits on the horizontal floor of the merry-go-round 3.58 m from the center. Find the child's acceleration. Answer in units of m/s^2.
 
Last edited:
Physics news on Phys.org
Strange- you seem to have neglected to show what YOU have already done on these problems.
 
ok for problem 1)
i did fnet = ma
i think i have it now
i did Fsin56 - mg = N

and i have no clue where to start on the second problem
 
Last edited:
The child's mass is irrelevant. Since the radius for the child is 3.58 meters, the child is going around a distance of 2π (3.58) meters every 16 s. From that you can determine the childs speed in mets per second. Of course that's a constant speed but the direction is changing. Do you have a formula for the the acceleration toward the center given the speed around the circle?
 

Similar threads

Newton's second law (My turtle named Newton being accelerated)
  • · Replies 9 ·
Replies
9
Views
2K
Calculating acceleration of a prism and block connected to a wall through a rope and pulley
  • · Replies 4 ·
Replies
4
Views
985
Newton's law problem: Pushing 2 stacked blocks on a horizontal table
  • · Replies 13 ·
Replies
13
Views
3K
Newton's 2nd Law: Why is Resistance Considered a Positive Force?
  • · Replies 3 ·
Replies
3
Views
2K
Explanation for Newton II giving negative mass in my Physics lab results please
  • · Replies 44 ·
2
Replies
44
Views
4K
Unbalanced force to find altitude of airplane
  • · Replies 4 ·
Replies
4
Views
2K
Newton's laws — Two stacked blocks sliding on a frictionless floor
  • · Replies 17 ·
Replies
17
Views
4K
Calculating the normal force with Newton's Laws
  • · Replies 10 ·
Replies
10
Views
2K
Rocket acceleration problem: confused about Newton's 2nd Law
  • · Replies 42 ·
2
Replies
42
Views
6K
Two forces acting on an object given in vectors - SOLVED
  • · Replies 1 ·
Replies
1
Views
1K