Homework help? [ block on inclined plane ]

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Homework Help Overview

The discussion revolves around a physics problem involving a block sliding down an inclined plane. The problem is divided into three parts: calculating the acceleration of the block, determining its speed after traveling a certain distance, and finding the perpendicular force exerted by the block on the surface of the incline.

Discussion Character

  • Exploratory, Conceptual clarification, Mathematical reasoning

Approaches and Questions Raised

  • Participants discuss the need for equations relevant to the problems and express uncertainty about which equations to use. There is mention of using a free body diagram to analyze the forces acting on the block, as well as references to kinematic equations.

Discussion Status

Some participants have offered guidance on the types of diagrams and equations that may be useful for solving the problems. There is an acknowledgment of the need for foundational knowledge, but no consensus has been reached on specific methods or solutions.

Contextual Notes

Participants note the importance of having reference materials, such as class notes or textbooks, to aid in solving the problems. There is an emphasis on understanding the underlying concepts rather than simply obtaining answers.

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Homework help?? [ block on inclined plane ]

Homework Statement



002 (part 1 of 3) 10.0 points
A 3.86 kg block slides down a smooth, fric-
tionless plane having an inclination of 28◦ .
The acceleration of gravity is 9.8 m/s2 .
Find the acceleration of the block.
Answer in units of m/s2.

003 (part 2 of 3) 10.0 points
What is the block’s speed when, starting from
rest, it has traveled a distance of 2.35 m along
the incline.
Answer in units of m/s.

004 (part 3 of 3) 10.0 points
What is the magnitude of the perpendicular
force that the block exerts on the surface of
the plane at a distance of 2.35 m down the
incline?
Answer in units of N.
 
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We are here to help myaxx... but can't do it for you. You need to throw up some equations and say why you are stuck.
 


i don't know what equations to use.
i just need the equations for each problem. i can get the answer myself :]
 


OK, but if this is for a class, you should either have a chapter or notes or something to use as a reference.

The first problem is best understood by use of a free body diagram, illustrating all the forces acting on the block. In this case only a portion of the force of gravity is available to pull the block down the slope. It is related to the trig of the situation.

The second is a problem in kinematics. You should somewhere have reference to equations which relate distance to either velocity and/or acceleration.

The third part deals with the force the block exerts on the plane and again can be found by consideration of the free body diagram. Does any of this ring a bell?
 

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