Chapter 1. Branches of Physics What do these have in common? Odd one out???

Chapter 1

Branches of Physics

What do these have in common?

Odd one out???

Measuring = units

MASS 1 kg

LENGTH/DISTANCE 1 m

TIME 1 s

CONVERT

1 kg = 2.20462262 pounds

1 meter = 3.2808399 feet

1 s = 1 s

Scale of the Universe A super cool applet

Convert, use Scientific Notation

Examples

Examples

Examples

Examples

Practice 12.5 days to seconds ________________________________________

3.5 km to mm ______________________________________________

43 cm to km _______________________________________________

22 mg to kg _______________________________________________

671 kg to µg _______________________________________________

8.76 x 107 mW to GW _______________________________________

1.753 x 10-13 s to ps _________________________________________

Precision & Sig. Dig.

LAB on Precision 1) Use the solid 1 m stick and measure the length of

the lab table

2) Use the 1 m stick marked with dm

3) Use the 1 m stick marked with cm

4) Use the actual meter stick to measure the length of your desk.

Write down the results to the maximum precision in each case.

SIG FIGS MADE SIMPLE

Pacifi

cP

resen

t Atla

ntic

Ab

sen

t1.450

14502500

0250.00

Sig. Fig.

100 000 100. 00

202 000 0.0050

340 505 0.00505

PracticeThe value of the speed of light is

now known to be 2.997 924 58 ×108m/s.Express the speed of light in the following ways:

a) 3 SF

b) 5 SF

c) 7 SF

How many Sig.Figs?300 000 000 m/s

3.00 ×108 m/s

25.030 °C

0.006 070°C

1.004 J

1.305 20 MHz

Adding and Subtracting# of digits 0.______ (after the

decimal point) = the least precise

3345.28 + 0.2 = 3345.48 = 3345.5

57.8 – 0.567 = 52.233 = 52.2

A QUICK SELF-CHECK 0.0845 kg ___________

37.00 h _____________

8630000.000 mi _____

0.000 000 0217 g ____

750 in ______

0.5003 s ______

Multiplying and Dividing#SF (result) = the least #SF

(A*B)

1.34 x 2300 = 3082 = 3.1103

#SF (result) = the least #SF (A/B)

23967 / 45 = 532.6 =5.3102

Practice Bicyclists in the Tour de France reach speeds of 34.0 miles per hour (mph) on flat sections of the road. What is this speed in a) km/h and b) m/s - ?1 mile = 1.61 km

Continued

PracticeThe largest diamond ever found had a size of 3106 carats. One carat is equivalent to a mass of 0.200g. Use the fact that 1 kg (1000.0g) has a weight of 2.205 lb under certain conditions, and determine the weight of this diamond in pounds.

Density lab

Remember: each student is supposed to turn in his / her own report.

Reading and Plotting Graphs

position time

15 m 2.5 s

30 m 5 s

45 m 7.5 s

60 m 10 s

Reading and Plotting Graphs

position

time

2m 1 s

8 m 2 s

18 m 3 s

32 m 4 s

50 m 5 s

72 m 6 s

Reading and Plotting Graphs

Find the speed of the object at:t = 15 s, t = 40 s

Write a formula for this graph