Calculating Tension in a Rope with an Electric Motor

[paddygills]

how do u work out the tension of a rope ? an electric motor is used to lift a mass of 40kg at a steady speed if friction forces are ignored calculate the tension of the rope. help i have just started physics double award and do not understand this

 

[berkeman]

how do u work out the tension of a rope ? an electric motor is used to lift a mass of 40kg at a steady speed if friction forces are ignored calculate the tension of the rope. help i have just started physics double award and do not understand this

Welcome to the PF.

You start by drawing a free body diagram (FBD) of the object (the mass), showing all the forces acting on the mass. Then you use the equation F = m * a to continue with the calculations. The F is the sum of all the forces acting on the mass m, and the resulting acceleration is a.

Show us how you start this problem now...

 

[Ambidext]

Neglecting friction, T = mg

Since the question indicated a steady speed, we have to assume that u > 0, and that the overall change in momentum(net force) is zero.

 

[paddygills]

so do i just multiply 40kg times gravity to get the right answer

 

[Ambidext]

Yes it is pretty straightforward.

 

[paddygills]

thanks for the help thought it was that but it seemed too easy