Question

fill in the blank 1. force applied to a machine to do work is called........ 2 Physical balance is a lever of......class. 3. Pulley a changes the ...... of force. 4 Normally efficiency of machine is ....... than 1. 5 Screw is type of......​

Answer 1

Answer:

2,1st class

3.angle of force

4.less and for ideal machine it's 1

5.simple machine

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Answer 2

Answer:

effort,1st type, direction , less than 100%,simple machine or inclined plane