Physics Chapter 11  Picture Problems

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1. Using this distance  time graph, calculate the average SPEED. 
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1. S = ? D=60km T=4hr S = D/T S = 60 km / 4hr S = 15 km/hr 

2. Using this distance  time graph, explain the relative speeds of A, B, & C. 
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2. a) Fast speed (steep line) b) No distance covered = 0 km/h (horizontal line) c) Moderate speed (medium slope to line) 

3. Part #1: Calculate the speeds of segments A, B, & C. Part #2: What is the total average speed of the trip? 
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3. a) 12m / 6s = 2m/s b) 0 m / 8s = 0 m/s c) 4m / 4s = 1m/s Part #2: 16m / 18s = 0.89 m/s 

4. a) What is the total distance covered? b) What is the total time spent? c) What is the average speed for the entire trip? 
4. a) 14km + 12km + 15km + 11km = 52km b) 12min + 8min + 9min +15min = 44min c) 52km / 44min = 1.18 km/min 

5. Calculate the average speed of the trip. 
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5. S = ? D = 180cm T = 8h S = D / T S = 180 cm / 8h S = 22.5 cm/h 

6. Using this data chart as your model of collected data, what is the missing number in the Distance column? 
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6. Each of the distances are 45 cm apart. The missing number should be 90 + 45 = 135.  
7. What is the acceleration shown on a) Line segment AB, b) Line segment BC, and c) Line segment CD? 
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7. (FV  OV) / T = A a) (30m/s10m/s)/100s = 0.2 m/s/s b) (30m/s  30m/s)/50s = 0 m/s/s (no acceleration) c) (5m/s30m/s)/50s =  0.5m/s/s (notice the negative sign) 

8. If this is a graph showing a straight line for speed versus time, what does it say about acceleration? 
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8. Since the speed is increasing at a constant rate (straight line), then you do have acceleration.  
9. a) Which line segments show positive acceleration? b) Which line segments show negative acceleration? 
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9. Lines A and B show positive acceleration. Line C shows that you are slowing down and thus acceleration would be a negative number.  
10. A plane takes 3 hours to cover 750 km. What is the SPEED of the plane? 
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10. 

11. A bullet train covers 354 kilometers in 2 hours. What is its average SPEED? 
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11. S = ? D = 354 km T = 2 hr S = D / T S = 354 km / 2 hr S = 177 km/hr 

12. The dragster takes 5 seconds to reach a velocity of 250 km/hr. What is its acceleration? 
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12. A=? FV=250km/hr OV=0km/hr T=5sec A = (FVOV)/T A = (250 km/hr  0 km/hr)/5s A = 50 km/hr/s 

13. Your new sports car can reach 150 km/hr in 4.5 seconds. What is its acceleration? 
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13. A=? FV=150km/hr OV=0km/hr T=4.5s A = (FVOV)/T A = (150km/hr  0km/hr) / 4.5s A = 33.33 km/hr/s 

14. The hydrofoil speedboat covers an 8 km course in 0.09 hours. What is its average speed? 
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14. S = ? D = 8km T = 0.09hr S = D / T S = 8km / 0.15hr S = 88.89 km/hr 

15. At what SPEED is a plane traveling if it covers 1,786 kilometers in 1.5 hours? 
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15. S = ? D = 1786 km T = 1.5hr S = D / T S = 1786 km / 1.5 hr S = 1190.67 km/hr 

16. The bicycle racer increased his velocity from 0.0 m/s to 9 m/s in 8s. What is his acceleration? 
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16. A=? FV=9m/s OV=0m/s T=8s A = (FVOV)/T A = (9m/s  0m/s)/8s A = 1.13 m/s/s 

17. A millipede decreases its velocity from 0.23 m/min to 0.15 m/min in 2 minutes. What is its acceleration? 
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17. A=? FV=0.15m/min OV=0.23m/min T=2min A = (FVOV) / T A = (0.15m/min  0.23m/min) / 2min A = 0.04 m/min/min 

18. Sara covers 46 meters on her skateboard in 4 minutes. What is her SPEED? 
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18. S = ? D = 46m T = 4 min S = D / T S = 46m / 4min S = 11.5 m/min 

19. A fly travels 3 meters from the kitchen door to a donut on the countertop in 5 seconds. What is its SPEED? 
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19. S = ? D = 3m T = 5 s S = D / T S = 3m / 5s S = 0.6 m/s 

20. Your new gocart can cover 3km in 7 minutes. What is its top SPEED? 
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20. S = ? D = 3km T = 7 min S = D / T S = 3 km / 7 min S = 0.43 km/min .... or .... 25.71 km/hr (To get the km/hr you have to multiply the .43 km/min by 60) 