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Question
Explain the difference between a uniform linear motion and a uniform circular motion.
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Solution
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RELATED QUESTIONS
When is work said to be done by a force?
Fill in the blank with suitable word :
The work done on a body moving in a circular path is __________
Write the formula for work done on a body when the body moves at an angle to the direction of force. Give the meaning of each symbol used.
Choose one or more correct alternatives.
For work to be performed, energy must be ______.
- transferred from one place to another
- concentrated
- transformed from one type to another
- destroyed
Fill in the boxe to show the corresponding energy transformation.
What do you understand by the term energy? Is energy a scalar or vector? How is the energy possessed by a body measured?
A truck driver can load oil drums into the back of the truck by pushing them up a sloping plank, or by lifting them directly. Each drum has a mass of 80 kg, the plank is 3 m long, and the back of the truck is 0.8 m above the ground.
(i) How much force would be needed to lift a drum into the truck directly/without using the plank? (Take g = 10 m/s2)
(ii) How much energy would be required in lifting the drum into the truck without the plank?
(iii) If the force needed to push the drum up the plank is 300 N, why is this less than the answer to part (i)?
(iv) When the truck is loaded, the driver drives off. List the major energy changes that take place in moving the truck.
(v) The driver has to stop at the factory gates. What happens to the kinetic energy of the truck?
