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Physics

Learn the toughest concepts covered in Physics with step-by-step video tutorials and practice problems by world-class tutors

Table of contents

10. Conservation of Energy

Intro to Energy Types

4 videos4 questions

VIDEOS 4

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PRACTICE 4

Textbook Question
A slingshot will shoot a 10-g pebble 22.0 m straight up. (b) With the same potential energy stored in the rubber band, how high can the slingshot shoot a 25-g pebble? (c) What physical effects did you ignore in solving this problem?
22
Textbook Question
Tarzan, in one tree, sights Jane in another tree. He grabs the end of a vine with length 20 m that makes an angle of 45° with the vertical, steps off his tree limb, and swings down and then up to Jane’s open arms. When he arrives, his vine makes an angle of 30° with the vertical. Determine whether he gives her a tender embrace or knocks her off her limb by calculating Tarzan’s speed just before he reaches Jane. Ignore air resistance and the mass of the vine.
43
Textbook Question
The maximum height a typical human can jump from a crouched start is about 60 cm. By how much does the gravitational potential energy increase for a 72-kg person in such a jump? Where does this energy come from?
431
Textbook Question
A slingshot will shoot a 10-g pebble 22.0 m straight up. (a) How much potential energy is stored in the slingshot’s rubber band?
118

Gravitational Potential Energy

15 videos1 question

VIDEOS 15

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PRACTICE 1

Multiple Choice
A $500 kg$ car is driving up a hill. What is the change in potential energy of the car when it undergoes a displacement of $\overset{⇀}{d} = (210 m) \hat{i} + (2.0 m) \hat{j}$ .
85

Intro to Conservation of Energy

15 videos1 question

VIDEOS 15

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PRACTICE 1

Multiple Choice
A $10 kg$ block slides down a $3.0 m$ tall frictionless ramp. How fast will the block be moving at the bottom? Use energy concepts to solve this problem.
80

Energy with Non-Conservative Forces

8 videos1 question

VIDEOS 8

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PRACTICE 1

Multiple Choice
An 800kg car skids to a stop from 30m/s through a distance of 90m. Calculate the coefficient of friction between the car and the road.
473
4

Springs & Elastic Potential Energy

11 videos4 questions

VIDEOS 11

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PRACTICE 4

Solving Projectile Motion Using Energy

6 videos4 questions

VIDEOS 6

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PRACTICE 4

Motion Along Curved Paths

1 video

VIDEOS 1

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Curved Paths & Energy Conservation
by Patrick Ford
693
9
04:18

Rollercoaster Problems

8 videos

VIDEOS 8

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Pendulum Problems

9 videos

VIDEOS 9

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Energy in Connected Objects (Systems)

8 videos

VIDEOS 8

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Force & Potential Energy

8 videos1 question

VIDEOS 8

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PRACTICE 1

Multiple Choice
A particle with a mass of 0.1kg moves according to the Potential Energy graph shown. What minimum speed does the particle need at Point A to reach Point B?
403
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1

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