Download presentation

Presentation is loading. Please wait.

Published bySincere Hazle Modified over 4 years ago

1
The Système International SI Units GEL2006 More free powerpoints at www.worldofteaching.com

2
Base Quantity Base Unit NameSymbolNameSymbol Time Length Mass Temperature Electric Current Amount of Substance Luminous Intensity t l m T, Ө I n (not in A Level) second metre kilogram kelvin ampere mole candela s m kg K A mol cd

3
Physical Quantity Defined as :UnitSpecial Name velocity acceleration density momentum force pressure work (energy) power electrical charge potential difference resistance

4
Homogenous Equations E p = m g h = Nm = kg kgms -2 kg -1 m kgms -2 m = kgm 2 s -2 kgm 2 s -2 = kgm 2 s -2 This equation is homogenous JkgNkg -1 m

5
Homogenous Equations v 2 = u 2 +2ax = + m 2 s -2 = m 2 s -2 + m 2 s -2 This equation is homogenous m 2 s -2 m 2 s -2 ms -2 m

6
Homogenous Equations F = mv r = kgms -2 = kgs -1 This equation is not homogenous Nkgms -1 m -1

7
Homogenous Equations What is missing? kgms -2 = kgs -1 The equation should read: F = mv 2 r ms -1 =v on rhs

8
Homogenous Equations Try these: E k = ½ m v 2 and v = u + at 2 J = kg m 2 s -2 N m = kg m 2 s -2 kg m 2 s -2 = kg m 2 s -2 OK ms -1 = ms -1 + ms -2 s 2 ms -1 = ms -1 + m Not OK s -1 is missing, so equation should read: V = u + at

9
Homogenous Equations Homework: Show that these equations are homogenous a) x = ut + ½at 2 b) T = 2π√l/g c) v = fλ d) I = nAve e) W = ½CV 2 What is missing here? f) F = mv - mu

Similar presentations

Presentation is loading. Please wait....

OK

Physical quantities and SI units

Physical quantities and SI units

© 2018 SlidePlayer.com Inc.

All rights reserved.

To make this website work, we log user data and share it with processors. To use this website, you must agree to our Privacy Policy, including cookie policy.

Ads by Google