How Is Newton's Third Law Applied in Calculating Forces on a Lawn Mower?

AI Thread Summary
Newton's Third Law is crucial for analyzing the forces acting on a lawn mower when pushed by a boy. The applied force of 32.9 N at an angle creates both horizontal and vertical components, affecting the normal force and frictional force. The normal force increases due to the vertical component of the applied force, while the frictional force can be calculated using the mower's mass and acceleration. After 0.58 seconds of acceleration at 1.37 m/s², the mower reaches a constant velocity, which requires a specific force to maintain. Understanding these forces is essential for solving the problem accurately.
F.B
Messages
81
Reaction score
0
I hate all of Newton's laws questions. They are so complicated. Can anyone please help me with this question.

A boy pushes a lawn mower (m=17.9 kg) starts from rest across a horizontal lawn by applying a force of 32.9 N straight along the handle, which is inclined at an angle of 35.1 degrees above the horizontal. The magnitude of the mowers acceleration is 1.37 m/s^2, which lasts for 0.58 s, after which the mower moves at a constant velocity. Determine the magnitude of
a)the normal force on the mower
b)the frictional force on the mower
c)the maximum velocity of the answer
d)the force applied by the boy needed to maintain the constant velocity

This is a long question so please help with what you know.
 
Physics news on Phys.org
Please show what you've done/tried.

Divide the force into horizontal and vertical components. Do remember to take into account the increase in normal force (the push is party directed vertically).
 

Thread 'Errors and significant figures'

I multiplied the values first without the error limit. Got 19.38. rounded it off to 2 significant figures since the given data has 2 significant figures. So = 19. For error I used the above formula. It comes out about 1.48. Now my question is. Should I write the answer as 19±1.5 (rounding 1.48 to 2 significant figures) OR should I write it as 19±1. So in short, should the error have same number of significant figures as the mean value or should it have the same number of decimal places as...
View full post »
Thread 'Collision of a bullet on a rod-string system: query'

Thread 'Collision of a bullet on a rod-string system: query'

In this question, I have a question. I am NOT trying to solve it, but it is just a conceptual question. Consider the point on the rod, which connects the string and the rod. My question: just before and after the collision, is ANGULAR momentum CONSERVED about this point? Lets call the point which connects the string and rod as P. Why am I asking this? : it is clear from the scenario that the point of concern, which connects the string and the rod, moves in a circular path due to the string...
View full post »
Thread 'A cylinder connected to a hanging mass'

Thread 'A cylinder connected to a hanging mass'

Let's declare that for the cylinder, mass = M = 10 kg Radius = R = 4 m For the wall and the floor, Friction coeff = ##\mu## = 0.5 For the hanging mass, mass = m = 11 kg First, we divide the force according to their respective plane (x and y thing, correct me if I'm wrong) and according to which, cylinder or the hanging mass, they're working on. Force on the hanging mass $$mg - T = ma$$ Force(Cylinder) on y $$N_f + f_w - Mg = 0$$ Force(Cylinder) on x $$T + f_f - N_w = Ma$$ There's also...
View full post »

Similar threads

Blowing Into Your Own Sail
Replies
25
Views
1K
How do you identify the systems in which Newton's Third Law is obeyed?
Replies
6
Views
1K
How Do You Calculate the Movement of a Push Lawn Mower?
Replies
3
Views
1K
Unbalanced force to find altitude of airplane
Replies
4
Views
2K
Understanding the Third Law of Newton — How can the forces be equal?
Replies
7
Views
2K
Why doesn't Newtons third law also apply to the frame?
Replies
2
Views
2K
A person pushes a 10.0 kg lawn mower at constant speed with a force of
Replies
6
Views
6K
Newton's 2nd Law: Why is Resistance Considered a Positive Force?
Replies
3
Views
2K
Newton's third law problem/kinematics (Airboat problem/no friction)
Replies
3
Views
4K
Understanding Newton's Third Law in Action: A Truck Pushing an SUV
Replies
4
Views
2K

Hot Threads

Recent Insights

Back
Top