Coefficient of kinetic friction and pulling force

AI Thread Summary
To determine the coefficient of kinetic friction for a 20-kilogram sled being pulled at a constant velocity with an 80 Newton force at a 30-degree angle, the horizontal component of the pulling force must equal the kinetic friction force. The normal force can be calculated by subtracting the vertical component of the pulling force from the sled's weight. The formula for kinetic friction is the frictional force divided by the normal force. Since the sled moves at constant velocity, the net force is zero, indicating that the pulling force's horizontal component balances the frictional force. Understanding these relationships is crucial for calculating the coefficient of kinetic friction accurately.
eureka360
Messages
9
Reaction score
0
hi everybody.. can i ask how to get a coefficient of kinetic friction if a 20 kilogram sled is being pulled across a horizontal surface at a constant velocity. The pulling force has a magnitude of 80 Newton and is directed at an angle of 30 degrees above the horizontal. please answer my question.. i badly need you help..
 
Physics news on Phys.org
I assume you know the formula for finding kinetic friction. If the sled is moving at constant velocity, what will be the relationship between the horizontal component of the pulling force and the kinetic friction? How do you find the normal force given the weight of the sled and the upward force that the person is helping ease the contact between the sled and the floor.
 

Thread 'Rolling without slipping on a curved surface'

Kindly see the attached pdf. My attempt to solve it, is in it. I'm wondering if my solution is right. My idea is this: At any point of time, the ball may be assumed to be at an incline which is at an angle of θ(kindly see both the pics in the pdf file). The value of θ will continuously change and so will the value of friction. I'm not able to figure out, why my solution is wrong, if it is wrong .
View full post »

Thread 'Struggling to understand the concept of this question (ice cube in water optics question)'

TL;DR Summary: I came across this question from a Sri Lankan A-level textbook. Question - An ice cube with a length of 10 cm is immersed in water at 0 °C. An observer observes the ice cube from the water, and it seems to be 7.75 cm long. If the refractive index of water is 4/3, find the height of the ice cube immersed in the water. I could not understand how the apparent height of the ice cube in the water depends on the height of the ice cube immersed in the water. Does anyone have an...
View full post »

Similar threads

Coefficient of kinetic friction of a block sliding across the ceiling
Replies
7
Views
1K
Newton's Second Law (Pulley Sustem)
Replies
3
Views
2K
Does coefficient of kinetic friction depend on speed?
Replies
16
Views
5K
What's the coefficient of kinetic friction?
Replies
8
Views
3K
Yes! Calculating Friction Coefficient
Replies
1
Views
1K
How to find the coefficient of kinetic friction
Replies
4
Views
3K
Question(s) Regarding Magnitude of Force (Window Washer Problem)
Replies
3
Views
1K
Finding work and the Change in Thermal Energy
Replies
5
Views
2K
Block sliding on a semicircular track with friction
Replies
10
Views
2K
Finding the angle of an inclined plane
Replies
2
Views
2K

Hot Threads

Recent Insights

Back
Top