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Physics Lecture 1: Units, Newton's Laws, and Energy

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Physics Lecture 1: Units, Newton's Laws, and Energy

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Questions and Answers

What is the principle behind the movement of a rocket?

The hot gases push against the inside tube of the rocket and escape out the bottom of the tube, causing the rocket to move in the opposite direction.

What is the formula for Work?

W = F × d

What is the equation that relates Power, Work, and Time?

P = W / T

A force of 200 N is applied to move an object 5 meters. How much work is done?

W = F × d = 200 × 5 = 1000 J Signup and view all the answers

What is the difference between Work and Power?

Work is the energy transferred, while Power is the rate at which work is done. Signup and view all the answers

A machine does 2000 J of work in 5 seconds. What is its Power output?

P = W / T = 2000 / 5 = 400 W Signup and view all the answers

What is the unit of Energy?

Joules (J) Signup and view all the answers

What is the formula for Kinetic Energy?

ΔK = W Signup and view all the answers

A boy lifts an object of 500 N to a height of 3 meters. How much work is done?

W = F × d = 500 × 3 = 1500 J Signup and view all the answers

What is the purpose of the equations of Uniform Acceleration?

To solve motion problems. Signup and view all the answers