https://www.youtube.com/watch?v=LXEoK1dufbk

1- What is the difference (subtraction) between the time it takes a softball pitch thrown at 70 mph to reach home and a 100 mph major league pitch.

2-You're at bat against a varsity softball pitcher, how much time (in seconds) do you have to decide if you're going to swing at the pitch?

a-2.5

b-.25

c-025

d-0025

3-How much less time do you have to field a 100 mph grounder, than you would a Serena Williams serve? (Again subtraction)

4-A softball pitched to you is only 37 feet away. How far is that in meters?

5-The pitch is coming at you at 70 miles per hour. Calculate that speed in meters per second...

6-Using x = v(t), calculate the time it took for the ball to reach you at the plate.

7-Did your answer match the video within an error of .05?

a-No

b-Yes

c-Not enough information given

https://www.youtube.com/watch?v=xgz5-XToJIw

8-To get things started, since we're talking baseball, a game invented here in the US, we will use feet per second for our speeds. Knowing that there are 5280 feet in a mile, and 3600 seconds in an hour, convert 15 mph to ft/s.

9-How many feet are there between first and second base in Major League Baseball?

a-120 ft

b-100 ft

c-60 ft 6 in

d-90

10-In the base stealing video, the runner went from first to second base in 3.5 s. Using your calculation for 15 mph to ft/s, How many feet from second base was he when he started? We are assuming this is the runner's average speed.

11-From the stretch, the pitcher's throwing motion takes how long?

a-0.8 seconds

b-0.70 seconds

c-0.45 seconds

12-During the time of the pitching the motion, the ball accelerated from 0 mph to 90 mph. Calculate the acceleration on the ball in ft/s^2 . First convert 90 mph to ft/s. Then divide by the time.

13-Whoa! That last answer was a huge number! If the acceleration due to gravity is 32 ft/s^2, how many "g's" is that previous answer?

14-How many seconds does it take for the catcher to get off the throw?

a-74 s

b-45 s

c-1.8 s

d-9 s

15-How long does it take for the catcher's throw to get to second base?

a-1.45 s

b-1.10 s

c-1.22 s

d-1.65 s

16-In stealing a base, what is the primary factor in the runner being successful in stealing a base?

a-The "jump"

b-The lead off

c- The speed of the runner

17-True or False: The primary factor in whether or not a catcher "catches" someone stealing is the accuracy of the throw. (And Salvy almost always "puts it on the money.")

a-True

b-False

18-For every one foot the catcher is "off", the base the runner gains an advantage of how many feet?

a-3 feet

b-2 feet

c-4 feet

d-1 foot

https://www.youtube.com/watch?v=5JQMqoPR6lM&feature=emb_title

19-In the sliding video how many milliseconds did it take the baseball player to run the last 10 ft to first base?

a-295 ms

b-260 ms

c-410 ms

20-How long did it take the baseball player to slide the last 10 ft. into 1st base.

a-270 ms

b-255 ms

c-245 ms

d-280 ms

21-What factor made the difference in times?

a-Sliding was faster because the dirt around first base reduced the friction.

b-Sliding was faster because the runner gained a fraction of accelration by diving

c-Sliding was slower due to the kinetic friction caused by the dirt on the runner.

22-Let's take a look at something here. I thought the 15 mph for a base runner was kind of slow. I mean, it was a heck of lot faster than I could run, but still 15 mph, equates to about 6.7 m/s. We saw earlier that Usain Bolt average speed was 100 m/9.59 s which is 10.4 m/s. I just looked the NCAA men's 100 m dash record this year--10.82 s. Calculate that speed in in mph.

23-Let's allow for the baseball helmet, clothes, baseball spikes instead of track spikes, etc. So let's put Christian Coleman's base path speed at 19 mph. Instead of taking a lead off and getting the "jump", Coleman gets in a modified sprinter stance to push off first base. Averaging 19 mph, how long would it take him to run the 90 ft to 2nd base? SAFE!!But can a world class sprinter hit? Doesn't need to...make a fortune as a pinch runner!