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Stopping Distance | Forces & Motion | Physics | FuseSchool

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The best beverages for committed athletes

Water: Good old H2O can be fine for those exercising at a low intensity, or for a short duration (less than 45 minutes). The amount needed will depend on the individual, but in general your fluid needs can be estimated by weighing yourself before and after exercise - each kilogram lost will equate to 1 Litre of fluid.

Sports drinks: A colourful combination of carbohydrates, electrolytes and water, sports drinks are ideal for fuelling muscles and rehydrating. But a lot more thought has gone into the flavour of sports drinks than you may realise! Research has shown fluid intake increases with added flavour, in comparison to plain water, so the better the taste - the more you'll drink.

Juice: Juice contains carbohydrates, an important energy source for our muscles and brains, so could be enjoyed alongside a recovery breakfast after a gruelling training session.

Milk: Although it may be the least appealing choice during a training session, milk's composition makes for an ideal post-exercise drink as it is a compact source of good quality protein, carbohydrates and electrolytes. This was demonstrated in a recent study that showed full cream milk, soy milk and a dairy meal replacement were effective in replacing lost fluids after activity. Furthermore, the carbohydrate content in milk is ideal for maximising glycogen replacement.

Shakes or smoothies: So we know milk is useful, but following an intense training session, adding some protein powder and/or a piece of fruit to make a smoothie can be a simple and tasty way to boost the carbohydrate and protein content.

And what about those to steer clear of?

In general, carbonated soft drinks are not recommended during or following training sessions, as the bubbles can cause gastrointestinal upset.

Alcohol is a depressant, and thus slows activity in the central nervous system, affecting concentration and performance. Although alcohol isn't commonly consumed before or during exercise, binges throughout the week or over the weekend can still adversely affect sports performance.

For more information refer to:

SDA Sports drinks Fact Sheet

SDA fluids in sport Fact Sheet

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The best beverages for committed athletes - Sports Dietitians Australia (SDA)

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Water: Good old H2O can be fine for those exercising at a low intensity, or for a short duration (less...

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After putting 45 fitness trackers through their paces—on the move and at rest—we like the reliable, easy-to-use Fitbit Inspire 3.

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Footwear construction and impact of sports injury

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Impact of saline water on plant irrigation

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The Physics of Baseball: How Far Can You Throw?

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The Physics of Baseball: How Far Can You Throw?

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Introduction
Have you ever seen a long, game-winning pass in a football game, a baseball player throw in a ball from way out in the outfield or a soccer goalie punt a ball all the way down the field? All of these actions involve a player trying to throw or kick a ball as far as possible. There is some science behind these throws and kicks. And sometimes it is all about the angle. The angle can affect just how far a throw or a kick can carry a ball. Should you make a shallow throw (straight out, parallel to the ground), a steep throw (throwing the ball high up in the air) or something in between? Try this sports science project to find out!

Background
An object that is thrown, kicked or otherwise launched through the air is called a projectile. The study of how projectiles move through the air is called projectile motion. When a projectile is launched, it has an initial velocity (its speed and direction of motion). When a projectile is moving through the air, however, it is subject to the force of gravity, which causes it to move down toward Earth. It is also subject to the force of air resistance, which slows the projectile down.

When air resistance is very low, a projectile moves in the shape of a parabola-a type of mathematical curve. (You can do an Internet search for "parabola" to see what one looks like.) The path the ball follows (called its trajectory) will determine how far it goes before it hits the ground. Adjusting the ball's initial angle and keeping its initial speed constant is one way to find out the best angle to throw a ball as far as possible. In this experiment you will throw a ball as hard as you can while changing the ball's initial angle relative to the ground. What angle do you think will make the ball go the farthest?
Materials

Sports ball of your choice (baseball, tennis ball, football, etcetera)

Large open area to throw the ball

Three each of three different objects to mark where the ball lands on the ground (for example, three sticks, three rocks and three golf balls)

Helper

Preparation

Make sure you have a large, open area to throw, and that there are no other people or objects in the way.

Do some stretching or warm-up exercises before you start the experiment-it will involve a lot of throwing!

Pick a place to stand in your large, open area. Mark a place on the ground so you know to always throw the ball from that location.

Pick a direction to throw your ball. (If it is a windy day, make sure you pick a consistent direction relative to the wind.)

What type of angle do you think will get the farthest distance-shallow, steep or medium?

Procedure

Throw your ball as hard as you can, relatively straight forward at a "shallow" angle-as parallel to the ground as you can. If you are familiar with measuring angles in degrees, imagine trying to throw the ball at about a 15-degree angle relative to the ground. Can you think of a time this type of throw would be best?

Have your helper mark where the ball lands (for example, with a rock).

Repeat the throw at that angle two more times. Try to consistently throw the ball as hard as you can, so its initial speed is constant. Have your volunteer mark each through. Why do you think it's important to perform the same test at least a few times?

Now repeat the procedure for a "medium" angle (outward and upward) of about 45 degrees three times. Remember to try and consistently throw the ball as hard as possible. Use a different marker object for where these throws land. How did this distance compare with the shallow angle?

Now, do the same for a "steep" angle (up in the air and slightly forward but not straight up) of about 75 degrees. How do you think this throw distance will compare with the others? Remember to try and consistently throw the ball as hard as possible. Use another different type of marker for this batch of throws.

Now, analyze the results of your experiment by looking at the markers. Which throws went farthest? What angle do you think is best if you want to throw the ball as far as possible?

Extra: Try the experiment using different types of balls. How do you think the ball size, weight and shape will affect what angle is best to throw the farthest? Did you get different results?

Extra: Repeat the exercise, this time kicking a ball instead. Do you think the angles will yield relatively similar distances? Did you get different results than when you threw the ball?

Observations and results
In most cases you should see that a medium, 45-degree angle made the ball go the farthest. When you throw the ball at a very shallow angle, gravity pulls it down and the ground is closer, which ends the throw sooner so it does not have as much time to travel as far forward. When you throw the ball at a very steep angle, most of its velocity is directed upward instead of forward, so it does not make much forward progress.

Depending on the type of ball and the amount of air resistance on it, however, you might see different results. A ball that has a lot of air resistance (such as a whiffle ball) might slow down significantly when it is in the air for a long time, so it might actually go farther at a shallower angle.

More to explore
How Far Can You Throw (or Kick) a Ball?, from Science Buddies
Projectile Motion, from the Physics Classroom
Science Activities for All Ages!, from Science Buddies
This activity brought to you in partnership with Science Buddies

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The Physics of Baseball: How Far Can You Throw?

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Introduction Have you ever seen a long, game-winning pass in a football game, a baseball player throw in a ball from way out in the outfield or a soccer goalie punt a ball all the way down the field? All of these actions involve a player trying to throw or kick a ball as far as possible.

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Weathering and erosion

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