Neco Model Questions Vol1 2019 Physics Question 5

Practice essay / theory question 5 from the 2019 Neco Model Questions Vol1 Physics examination. This question covers work, energy, forces, inclined plane, kinematics .

Neco Model Questions Vol1 2019 Physics Essay / Theory

Topics: work energy forces inclined plane kinematics

Question 5 NECO_MODEL_QUESTIONS_VOL1 • 2019 • PHYSICS • essay

Neco Model Questions Vol1 2019 Physics Question 5 diagram

A 5.0 kg block is placed at the bottom of a smooth inclined plane that makes an angle of 30° with the horizontal. The length of the plane is 8.0 m. A rope pulls the block up the plane. The rope exerts a constant tension of 40 N directed 20° above the horizontal. The coefficient of kinetic friction between the block and the plane is 0.20. The block starts from rest at the bottom of the plane. Using the information given and the diagram supplied, answer the following:

Question Parts

( a )

Determine the magnitude of the component of the 40 N pulling force that acts parallel to the surface of the inclined plane.

( b )

Calculate the work done on the block by each of the following forces as it moves the full 8.0 m up the plane: (i) the pulling force, (ii) the weight of the block, (iii) the frictional force.

( c )

Find the net work done on the block and determine its speed when it reaches the top of the plane.

( d )

Now suppose the pulling force is not constant but increases uniformly from 0 N at the bottom to 40 N at the top of the plane (the direction of the force remains 20° above the horizontal). (i) Calculate the work done by this varying force over the 8.0 m displacement. (ii) Based on this work, discuss whether the block can still reach the top of the plane. If it can, give its speed; if it cannot, state the reason.

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About This Question

This is Neco Model Questions Vol1 2019 Physics Question 5. It is one of the essay questions from the 2019 Neco Model Questions Vol1 Physics examination.

The question covers work, energy, forces, inclined plane, kinematics .

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