Physics Help Motion and Forces

But I will give you a hint. For problem 1, the friction force acting on the fridge is equal and opposite to the component of the weight force acting down the ramp. Use trigonometry to find this component and then use the formula for friction force to solve for the coefficient of static friction. In summary, for problem 1, the coefficient of static friction can be found by setting up a force equation using the weight force and the friction force. Use trigonometry to find the component of the weight force acting down the ramp and then solve for the coefficient of static friction using the formula for friction force.
  • #1
luvzdaladeez
3
0

PROBLEM 1
A 91 kg refrigerator is placed on a ramp. The refrigerator begins to slide when the ramp is raised to an angle of 34 degrees. What is the coefficient of static friction?


PROBLEM 2
A student moves a box of books down the hall by pulling on a rope attached to the box. The student pulls with a force of 185N at an angle of 25 degrees above the horizontal. The box has a mass of 35.0 kg, and coefficient between the box and the floor is 0.27. Find the acceleration of the box.

I NEED GUIDANCE ON HOW TO SOLVE THESE PROBLEMS
PLEASE INCLUDES STEPS SO THAT I CAN SEE EXACTLY HOW THE ANSWER WAS FOUND.

THANX
 
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  • #2
Well if we concentrate on problem 1:

First of all draw a force diagram acting on the fridge.
resolve the forces perpendicular and parallel to the fridge's motion.
set up a force equation using f=ma.
 
  • #3
I don't think this forum hands out answers.
 

What is the difference between speed and velocity?

Speed is a measure of the distance traveled by an object in a given amount of time. Velocity, on the other hand, is the measure of the distance traveled by an object in a given direction in a given amount of time. In other words, velocity takes into account the direction of movement, whereas speed does not.

What is Newton's First Law of Motion?

Newton's First Law of Motion, also known as the Law of Inertia, states that an object will remain at rest or in motion at a constant speed and direction unless acted upon by an external force. In other words, an object will continue to do what it is already doing unless a force causes it to change.

What is the relationship between mass and force?

According to Newton's Second Law of Motion, force is equal to mass multiplied by acceleration. This means that the greater the mass of an object, the more force will be needed to accelerate it at a given rate.

What is friction and how does it affect motion?

Friction is a force that opposes the motion of an object. It is caused by the interaction between two surfaces and is dependent on factors such as the texture and roughness of the surfaces. Friction can either slow down or prevent the motion of an object, or it can be used to control and manipulate motion.

How do balanced and unbalanced forces affect an object's motion?

When the forces acting on an object are balanced, the object will remain at rest or continue moving at a constant speed. When the forces are unbalanced, there is a net force acting on the object, causing it to accelerate in the direction of the net force. This acceleration can be either an increase or decrease in speed, or a change in direction.

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