from The Open University
Alternatively you can skip the navigation by pressing 'Enter'.
Get Started menu item
What's On menu item
TV
-
Monday 20th May
- 9:00am, Eden, Bang Goes The Theory s6e5
- 9:30am, Eden, Bang Goes The Theory s6e6
- 9:30am, Eden, Bang Goes The Theory s6e6
- 2:00pm, Eden, Bang Goes The Theory s6e5
- 2:30pm, Eden, Bang Goes The Theory s6e6
- 2:30pm, Eden, Bang Goes The Theory s6e6
- 7:00pm, Eden, Bang Goes The Theory s6e5
- 7:30pm, Eden, Bang Goes The Theory s6e6
- 7:30pm, Eden, Bang Goes The Theory s6e6
- 10:00pm, BBC Four, Timewatch: Last Day of WW1
Radio
- Monday 20th May
- Wednesday 22nd May
- Friday 24th May
- Sunday 26th May
-
Monday 20th May
Motion under gravity
From the moment that Galileo dropped two cannonballs of different sizes and...
From the moment that Galileo dropped two cannonballs of different sizes and weights from the top of the Leaning Tower of Pisa mankind has been fascinated by the impact of gravity. This Unit looks at gravity, its impact on objects and how the energy involved in the movement of objects is dispersed or stored.
After studying this unit you should know:
- All objects, irrespective of their mass, experience the same acceleration g when falling freely under the influence of gravity at the same point on the Earth. The weight of an object is the force F g due to gravity acting on the object, and for an object with mass m the weight is given by F g=mg.
- If the height of an object of mass m changes by Δh, the change in gravitational energy is ΔE g=mgΔh.
- If gravity is the only force acting on an object, the sum of kinetic energy and gravitational energy is constant. Increases in kinetic energy are balanced by decreases in gravitational energy, and vice versa.
- There are various forms of potential energy, all of which depend on the position of an object rather than on its motion. The potential energy of an object increases as it moves in the opposite direction to that of the force acting on it. Strain energy depends on the extension or compression of an object.
- Duration: 4 hours
- Published on: Thursday 21st July 2011
- Level: Introductory
- Posted under: Physics and Astronomy
Motion under gravity
Introduction

From the moment that Galileo dropped two cannonballs of different sizes and weights from the top of the Leaning Tower of Pisa mankind has been fascinated by the impact of gravity. This unit looks at gravity, its impact on objects and how the energy involved in the movement of objects is dispersed or stored.
This unit is from our archive and is an adapted extract from How the universe works (S197) which is no longer taught by The Open University. If you want to study formally with us, you may wish to explore other courses we offer in this subject area [Tip: hold Ctrl and click a link to open it in a new tab. (Hide tip)] .
Archive content
This is an extract from an Open University course which is no longer available to new students. If you found this interesting you could explore more free Physics and Astronomy course units or view the range of currently available OU Physics and Astronomy courses.
Other pages You might like

Try: Astronomy
Thanks to cutting-edge radio and infra-red astronomy, our understanding of the universe...

Try: Introduction to active galaxies
The field of active galaxies is recognised as one of increasing importance. But how do we...

Study: Practical science: physics and astronomy
This practical science course offers a choice of activities in physics and astronomy as...

Try: The physical world: waves and relativity
This album explores the science of waves. Five video tracks feature two pair trawling...

Try: Microbes – friend or foe?
Microbes often get a bad name. Whilst some of them do cause disease, others play vital...

Study: Exploring mathematics
gives you a good understanding of the nature and scope of...

Try: The physical world: collisions
It has been called a 'Big Bang Machine', but what is the Large Hadron Collider and what...

Try: Health and safety in the laboratory and...
Health, safety and risk assessment are of paramount importance both in the laboratory and...

Study: Astronomy
This introductory astronomy course looks at the structure of stars and their life cycles,...

Try: The physical world: helicopters
Want to learn to fly a helicopter? In this album Royal Berkshire Ambulance pilots show...
Try: Living without oil
Crude oil is currently our most important global source of energy. It is vital in the...

Study: Mathematical methods and models
Solve real problems by transforming them into mathematical models and learning methods of...
Comments
Be the first to post a comment
Copyright & revisions
Copyright information
- Creative-Commons: The Open University is proud to release this free course under a Creative Commons licence. However, any third-party materials featured within it are used with permission and are not ours to give away. These materials are not subject to the Creative Commons licence. See terms and conditions. Full details can be found in the Acknowledgements section.
Feeds
If you enjoyed this, why not follow a feed to find out when we have new things like it? Choose an RSS feed from the list below. (Don't know what to do with RSS feeds?)
Remember, you can also make your own, personal feed by combining tags from around OpenLearn.
Alternative Formats
Tags, Ratings and Social Bookmarking
Page Tags
Sign in or create a free account to add tags to your personal tag cloud using:
Have you tried our free courses?
Back on the streets
More Or Less returns
OU TV & Radio
-
Bang Goes The Theory s6e5Eden
Tuesday 1:00 -
Bang Goes The Theory s6e7Eden
Tuesday 1:00 -
Bang Goes The Theory s6e6Eden
Tuesday 1:25 -
Bang Goes The Theory s6e6Eden
Tuesday 1:25 -
Bang Goes The Theory s6e8Eden
Tuesday 1:25
Views
Votes
Comments
Tags
- climate change (373)
- business (277)
- diaries (194)
- bottom line (169)
- food (168)
- Rough Science (162)
- BBC Two (145)
- internet (145)
- BBC Radio 4 (140)
- BBC (133)
- Scotland (121)
- points for debate (120)
- listings (120)
- Bang goes the Theory (116)
- children (116)
- Creative Climate (116)
- English Civil War (115)
- astronomy (108)
- Thinking Allowed (105)
- religion (98)
- marketing (94)
- 20th century (94)
- Charles I (93)
- communication (92)
- evolution (91)
- sustainability (89)
- research (88)
- architecture (85)
- energy (83)
- Charles Darwin (78)
OpenLearn Links
Copyrighted imageCredit: Background image Lucian Milasan | Dreamstime.com 

