# Day 20 Notes Force Diagrams (p. 19-20)

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## Presentation Transcript

### Slide1:

Sketch the graph below with the following three situations: Practice Problem—Copy this question in the BOTTOM box on page 46 and answer it… x(m) t(s) 1 3 2 Moving forward slowly at constant speed (start from 0 ) 2. Moving forward quickly at constant speed (start from 0 ) 3 . Moving backward slowly at constant speed (start from 0 )

### Slide2:

Physics with Astronomy (Day 6) Agenda : 9/23/2016 Warm-up Practice Problem — p. 46 (Bottom box) Finish Acceleration Lab —p. 30-32 Sign on Moodle and complete assignments Homework : C omplete  New assignment 

### Slide3:

You can calculate speed by… Turn to P age 30 in the packet. In order to find the speed you need to measure…

### Slide4:

Turn to P age 30 in the packet. Set up the ramp by… Add more steps as you do them. Make sure you finished your hypothesis and wrote down the experimental procedures.

### Slide5:

(Using 1 Book) Complete 3 trials timing from 0 cm to 30 cm . 1 book 30cm 60cm 90cm 1.64 1.74 1.76

### Slide6:

(Using 1 Book) Complete 3 trials timing from 0 cm to 6 0 cm . 1 book 30cm 60cm 90cm 1.64 1.74 1.76 2.58 2.45 2.59

### Slide7:

(Using 1 Book) Complete 3 trials timing from 0 cm to 90 cm . 1 book 30cm 60cm 90cm 1.64 1.74 1.76 2.58 2.45 2.59 3.16 3.01 3.19

### Repeat using a medium ramp:

(Using 2 Books) Repeat using a medium ramp 30cm 60cm 90cm 2 books 1.13 1.18 1.10

### Repeat using a medium ramp:

(Using 2 Books) Repeat using a medium ramp 30cm 60cm 90cm 2 books 1.13 1.18 1.10 1.76 1.69 1.69

### Repeat using a medium ramp:

(Using 2 Books) Repeat using a medium ramp 30cm 60cm 90cm 2 books 1.13 1.18 1.10 1.76 1.69 1.69 2.06 2.03 2.01

### Repeat using a high ramp:

(Using 3 Books) Repeat using a high ramp 30cm 60cm 90cm 3 books 0.95 0.94 0.92

### Repeat using a high ramp:

(Using 3 Books) Repeat using a high ramp 30cm 60cm 90cm 3 books 0.95 0.94 0.92 1.35 1.32 1.39

### Repeat using a high ramp:

(Using 3 Books) Repeat using a high ramp 30cm 60cm 90cm 3 books 0.95 0.94 0.92 1.35 1.32 1.39 1.60 1.61 1.63

### Slide14:

(Using 1 Book) Determine the Average Time 1.64 1.74 1.76 2.58 2.45 2.59 3.16 3.01 3.19 1.71 2.54 3.12 (Trial 1 + Trial 2 + Trial 3) Ave. Time = 3

### Slide15:

(Using 1 Book) 1.64 1.74 1.76 2.58 2.45 2.59 3.16 3.01 3.19 1.71 2.54 3.12 0.18 0.24 0.29 1 m 100 cm Convert position to meters 30 cm x = 0.60 m 0.90 m Example: Ave. Velocity Change in Position = 0.17544 = Average Time 1.71 s = 0.18 m/s = Round to 2 places 30 6 0 90 0.30 m 0.30 m 0.30 m

### Slide16:

(Using 1 Book) 1.64 1.74 1.76 2.58 2.45 2.59 3.16 3.01 3.19 1.71 2.54 3.12 0.18 0.24 0.29 0.60 m 0.90 m 30 6 0 90 0.30 m Final Velocity = 2 x Average Velocity Final Velocity = 2 x 0.18 m/s = 0.36 m/s 0.36 0.48 0.58

### Slide17:

( ) (Using 1 Book) 1.64 1.74 1.76 2.58 2.45 2.59 3.16 3.01 3.19 1.71 2.54 3.12 0.18 0.24 0.29 0.60 m 0.90 m 30 6 0 90 0.30 m 0.36 0.48 0.58 0.21 0.19 0.19 Acceleration Change in Velocity Acceleration v f – v i Average Time Acceleration 0.36 m/s 0.2105263 m/s/s, or 0.21 m/s 2 = = = = Average Time 0 m/s 1.71 s -

### Slide18:

Distance vs. Time Graph 2 1 Low Ramp Position (m) Avg. Time (s) 0 0 0.30 1.71 0.60 2.54 0.90 3.12 Position (m ) 0.80 0.60 0.40 0.20 0.90 0.30 0.50 0.70 3 Time (s) 4 0.5 1 .5 2.5 3 .5 Curved line on a position vs. time graph means accelerate motion. Curve up means speeding up , and curve down means slowing down. Make a mark every 3 lines 0.10 0 Make a mark every 10 lines

### Slide19:

Distance vs. Time Graph 0 2 1 Position (m ) 0.80 0.60 0.40 0.20 0.90 0.30 0.10 0.50 0.70 3 Time (s) 4 0.5 1 .5 2.5 3 .5 Red line for medium ramp has a steeper curve. This means it has a greater acceleration! Medium Ramp Position (m) Avg. Time (s) 0 0 0.30 1.14 0.60 1.71 0.90 2.03

### Slide20:

Distance vs. Time Graph 0 2 1 Position (m ) 0.80 0.60 0.40 0.20 0.90 0.30 0.10 0.50 0.70 3 Time (s) 4 0.5 1 .5 2.5 3 .5 Green line for higher ramp has a steeper curve. This means it has a greater acceleration! High Ramp Position (m) Avg. Time (s) 0 0 0.30 0.94 0.60 1.35 0.90 1.61

### Slide21:

Distance vs. Time Graph 0 2 1 Position (m ) 0.80 0.60 0.40 0.20 0.90 0.30 0.10 0.50 0.70 3 Time (s) 4 0.5 1 .5 2.5 3 .5 Graph Key Low ramp = Medium ramp = High ramp =