The Velocity of Birds

 Young scientist was obsessed with kinematics of the fastest bird in the world. He spent his entire life tracking birds to understand the limits.
 One day, he found a bird that can go from 0 to 380 km per hour in few seconds. He called him Flash. He observed his wings to understand how can he accelerate so fast. According to his calculations, he found out its because of his light bones and span of the wings. When he dives mid air he accelerates from his initial speed to his top speed.
 The scientist finally understood that the bird’s speed was caused by gravity. As Flash dived, gravity increased his velocity until the forces acting on him became equal. At that moment, acceleration became zero, showing that even the fastest bird is controlled by the laws of physics.

Written by E.V, S.S.,A.P, R.T
 

Rescue Christmas Miracle
 
 A skier was going down a steep snowy hill on a sunny winter day.
 
 The hill had a large angle, which increased the gravitational force pulling him down.
 Because of gravity, the skier started to accelerate and his speed increased every second.
 The friction between the skis and the snow was small, so it did not slow him down much.
 Suddenly, an avalanche started above him on the slope.
 The snow began to move because the gravitational force was stronger than friction.
 At first, the avalanche had low speed, but due to acceleration it quickly became faster.
 The skier tried to ski straight downhill to increase his 

velocity.

velocity.
 By changing his body position, he reduced air resistance and gained more speed.
 The angle of the slope affected both the skier and the avalanche in the same way.
 The avalanche had a very large mass, so its momentum was extremely dangerous.
 Just when the avalanche was close, a rescue helicopter appeared.
 The helicopter stayed in the air thanks to lift force created by rotating blades.
 A rope was lowered, and an upward force lifted the skier against gravity.
 
 The skier was saved while the avalanche continued downhill and lost energy in the valley.

Written by : B.K ,P.S, J.V and S.G

Nasa Experiment

 Nasa was doing an experiment. They were testing their newest model of rocket.
 First they needed to find out the velocity of the rocket. They determined the distance 50 meters. They started the rocket and meassured how fast by the time it reached the said height. It was 10 seconds. Now they have to calculate the velocity by formula : v=s/t. The velocity equals 5m/s.
 Next, they put the rocket into deserted place and took stop-watches to meassure at what time it reaches different heights. For example at 2s it reached 2.5m/s-2 of acceleration. As it reached 10s it turned over and started free fall.
 The experiment was finished and it was successful and save. The model rocket was good to go to the space. 

Written by A.Ž., R.B., D.P. and A. Z.

A Trip to Dubai

This was the year we decidet we didn’t want to go skiing and planned girl’s trip do Dubai

We went to Vienna by car at 5am. The road was so long (s=190000m) and it took us 127min. We got there and went to check in our luggage. Romanka’s was (m= 10kg), Olivka’s was (m=9000g) Veronika’s was (m=500dkg) and Kaja’s was overweight (m= 0,015t)

We headed to our gate and boarded the plane. The plane accelerated along the runway with an acceleration of about 2.2 m/s², pushing us back into our seats as it reached take-off speed. Our flight was (t=20400s) long and the distance we flew there was (s= 4240km).

When we got there, we immediately went to the beach. It was so hot there un comparison to Slovakia(T= 26 °C)

That’s when we saw an attraction — jumping from a high ramp into the sea. The height of the ramp was (h = 15 m).

At first, we were scared, but then we decided to try it. When we jumped, gravity pulled us down with an acceleration of about (a = 9.81 m/s²). We were in the air for less than (t =2 s), but it felt much longer. Just before hitting the water, our speed was around (v =17 m/s). When we touched the sea, the water slowed us down very quickly until our speed became (v = 0 m/s).

Even though we all had different masses, we fell the same way and reached the water almost at the same time. After the jump, our heart rates were high, and we couldn’t stop laughing.

During the rest of the trip, we explored Dubai, walked long distances through the city (s = several km per day), went shopping, and spent hours at the beach. Every evening, we were tired but happy.

After a few days, it was time to go home. The flight back had the same distance (s = 4240 km) and similar flight time. When we finally arrived back in Slovakia, we were

exhausted, but we knew the trip was worth it.

This girls’ trip wasn’t just fun — it also showed us that physics is everywhere, even on holiday.

Written by R.B.K+K.D+V.K.+O.R. 

Janka Experiencing Physics
 
 Janka stood at the top of the slope, staring down the slalom course.
 
 The gates curved back and forth like a challenge written into the mountain. She pushed off and gravity immediately increased her velocity. The wind rushed past her helmet as the skis accelerated over the ice.
 Approaching the first gate, she leaned into the turn. Her body wanted to move straight, but the skis carved a curved path.
 The inward pull she felt was centripetal force guiding her around the turn.
 Snow sprayed outward as her velocity changed direction. Each gate demanded a sharper lean and stronger control.
 As her speed increased, the required centripetal force 

grew stronger.Her legs trembled while holding the tight circular arcs. The mountain blurred as physics and instinct worked together. One final turn tested her balance and focus. 

 One final turn tested her balance and focus.

 She crossed the finish line and slowed to a glide. Smiling, she realized she had felt physics through motion, force, and speed. 

Written by T.T.S. +K.K. + A.K.  + K.W. 

 Skiing on a Snowy Mountains
 
 One cold winter morning, my family and I went skiing on a snowy mountain. The slopes were long and smooth, perfect for racing down.
 
 I was skiing as fast as I could. I skied 200m in 20seconds. I really wanted to know how fast i skied. My brothers speed was 5m/s. I wanted to be faster than him. Distance was 200m and the time was 20s that means if i want to calculate velocity i need to divide 200 with 20 that mean the velocity will be 10m/s.
 
 
 By measuring how far I skied and how long it took, I was able to calculate my velocity. Physics helped me understand how fast I was. 

Written by E.G.+M.J.+K.V.+A.D.

Slalom

Yesterday I have decided to go skiing with my friends.

When I wanted to go to the top of the hill I needed to use the poma. When I sat down on it I used the Hooke´s law which is the extension of the untouched string. The distance from the top to bottom is 100m and the displacement is 50m. On the top of the hill my initial speed was 0s but it accelerated as I went down. I used tangential acceleration and normal acceleration which is An and changes the direction. Which is a=at+an. I used non-uniform linear motion and in the turn I decelerated and used non-uniform circular motion and continued to use it all the way to the bottom of the hill where we decelerated and our speed was again v=0m x s.

 Written by: N.M. , D.M.,  J.V. and  T.T. 

Thank you for reading  this book