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CBSE › Class 9 › Science › Work, Energy, and Simple Machines (Class 9 NCERT New)
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1. _________________________________: the energy transferred to an object when an external force acts on the object to move it.

2. ____________________: the rate of doing work.

3. _________________________________: the measure of the change in input needed to do a certain amount of work when using a simple machine.

4. Why do we use actual mechanical advantage in addition to ideal mechanical advantage?

5. Driving a car 100 m requires the same amount of ______________ as pushing the same car 100 m by hand.

6. Work is done anytime a force is applied over a period of time.

7. What is the name for the turning force of a lever?

8. What is the name of the pivot point in a lever?

9. What is the IMA of this pulley system?

10. Which of the following objects is an example of a third-class machine?

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