Welcome to Physics Forums,physics_learn said:I need help with this question:
Please see attachement. I tried to solve by making a free body diagram of all the blocks but i don't seem to get to a solution
Any sugestions on how to solve are greatly appreciated.
Thanks
Hootenanny said:Welcome to Physics Forums,
Firstly, I'm assuming that since no 'stiffness parameter' given, the question means that the string does not undergoe any compression or extension, would that be correct?
Start by analysing the forces on each block.physics_learn said:That is correct, the string compression or extension is neglected. We don't know the material of the string either so we assume the string only applies tension.
Any idea on how to solve this question. Thank you?
No, it means that all three blocks move with the same velocity.physics_learn said:I tried to do the free body diagram for all blocks but I'm confused about the part that says "the blocks do not move relative to each other". Does this mean that the system is moving with constant velocity?
Start by analyzing the forces on each block. If you don't know a given force, label it and continue. (For example, call the normal force N.) Apply Newton's 2nd law.and how do you calculate the normal force between block 3 and block 2?
Absolutely. That contact force has both a normal and a vertical component.physics_learn said:I am still not sure how to calculate the normal force. Do i have to consider a contact force between blocks 2 and 3?
Some tips for solving block and friction problems include drawing a free body diagram, using Newton's second law, and considering the direction and magnitude of forces acting on the block.
To calculate the coefficient of friction, you can use the formula μ = Ff/N, where μ is the coefficient of friction, Ff is the force of friction, and N is the normal force.
Some common mistakes to avoid include forgetting to include all forces acting on the block, using the wrong units for calculations, and neglecting to consider the direction of forces.
To determine the acceleration of a block, you can use Newton's second law (F = ma) and solve for acceleration. Make sure to consider the direction of forces and use the appropriate units for calculations.
There is no specific order in which you must solve a block and friction problem, but it is important to carefully consider all forces and use logical steps in your calculations to ensure an accurate solution.