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QR Challenge: Regular Physics Momentum Review

Created using the ClassTools QR Treasure Hunt Generator

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Teacher Notes

A. Prior to the lesson:

1. Arrange students into groups. Each group needs at least ONE person who has a mobile device.

2. If their phone camera doesn't automatically detect and decode QR codes, ask students to

3. Print out the QR codes.

4. Cut them out and place them around your class / school.

B. The lesson:

1. Give each group a clipboard and a piece of paper so they can write down the decoded questions and their answers to them.

2. Explain to the students that the codes are hidden around the school. Each team will get ONE point for each question they correctly decode and copy down onto their sheet, and a further TWO points if they can then provide the correct answer and write this down underneath the question.

3. Away they go! The winner is the first team to return with the most correct answers in the time available. This could be within a lesson, or during a lunchbreak, or even over several days!

C. TIPS / OTHER IDEAS

4. A detailed case study in how to set up a successful QR Scavenger Hunt using this tool can be found here.

Questions / Answers (teacher reference)

Question

Answer

1. 1. You are sitting on a rolling cart that is at rest. The mass of you and the cart is 80 kg. You throw a medicine ball of mass 15 kg with a speed of 8 m/s away from you. How fast do you move in the opposite direction?(1.5 m/s)
2. 2.Two cars are hurtling toward each other, both traveling at 40 m/s. One has a mass of 150 kg and the other 200 kg. After impact the smaller car is moving at 60 m/s in the direction it came from. What the velocity of the bigger car?(35 m/s)
3. 3. Tiger Woods has an average drive speed of 180 mph. If Tiger Woods uses a 46 g golf ball and hits a 180 mph drive with an impact time of 0.5 ms, how much force does the golf ball experience?(7400 N)
4. 4. An AK-47 has a mass of 4.3 kg and fires a bullet with mass 123 g with a muzzle velocity of 720 m/s. What is the difference of the kick back speed of the gun when held in the air versus pressed against the shoulder of an 80 kg man?(19.5 m/s)
5. 5. You crash your car into a tree going at 35 m/s. Your head (15 kg) flies forward. What is the difference in impact forces with an airbag (impact time = 0.35 sec) versus no air bag (impact time = 0.025 sec) if after impact your head is moving backward with a speed of 3 m/s?(21000 N)
6. 6. With the engines off, a spaceship is coasting at a velocity of 230 m/s through outer space. It fires a rocket that is 1300 kg. The mass of the spaceship (not including the rocket) is 4 million kg. If the firing of the rocket brings the spaceship to a halt, what is the velocity of the rocket?(354000 m/s)
7. 7. A 0.5 kg air track glider with an initial speed of 4 m/s collides with another similar glider, initially at rest. If the struck glider moves off at 3 m/s, how much Kinetic Energy is lost during the collision?(1.73 J)

 


Regular Physics Momentum Review: QR Challenge

https://www.classtools.net/QR/decode.php?text=1.-You-are-sitting-on-a-rolling-cart-that-is-at-rest.-The-mass-of-you-and-the-cart-is-80-kg.-You-throw-a-medicine-ball-of-mass-15-kg-with-a-speed-of-8-m/s-away-from-you.-How-fast-do-you-move-in-the-opposite-direction?

Question 1 (of 7)

 


Regular Physics Momentum Review: QR Challenge

https://www.classtools.net/QR/decode.php?text=2.Two-cars-are-hurtling-toward-each-other,-both-traveling-at-40-m/s.-One-has-a-mass-of-150-kg-and-the-other-200-kg.-After-impact-the-smaller-car-is-moving-at-60-m/s-in-the-direction-it-came-from.-What-the-velocity-of-the-bigger-car?

Question 2 (of 7)

 


Regular Physics Momentum Review: QR Challenge

https://www.classtools.net/QR/decode.php?text=3.-Tiger-Woods-has-an-average-drive-speed-of-180-mph.-If-Tiger-Woods-uses-a-46-g-golf-ball-and-hits-a-180-mph-drive-with-an-impact-time-of-0.5-ms,-how-much-force-does-the-golf-ball-experience?

Question 3 (of 7)

 


Regular Physics Momentum Review: QR Challenge

https://www.classtools.net/QR/decode.php?text=4.-An-AK-47-has-a-mass-of-4.3-kg-and-fires-a-bullet-with-mass-123-g-with-a-muzzle-velocity-of-720-m/s.-What-is-the-difference-of-the-kick-back-speed-of-the-gun-when-held-in-the-air-versus-pressed-against-the-shoulder-of-an-80-kg-man?

Question 4 (of 7)

 


Regular Physics Momentum Review: QR Challenge

https://www.classtools.net/QR/decode.php?text=5.-You-crash-your-car-into-a-tree-going-at-35-m/s.-Your-head-(15-kg)-flies-forward.-What-is-the-difference-in-impact-forces-with-an-airbag-(impact-time-=-0.35-sec)-versus-no-air-bag-(impact-time-=-0.025-sec)-if-after-impact-your-head-is-moving-backward-with-a-speed-of-3-m/s?

Question 5 (of 7)

 


Regular Physics Momentum Review: QR Challenge

https://www.classtools.net/QR/decode.php?text=6.-With-the-engines-off,-a-spaceship-is-coasting-at-a-velocity-of-230-m/s-through-outer-space.-It-fires-a-rocket-that-is-1300-kg.-The-mass-of-the-spaceship-(not-including-the-rocket)-is-4-million-kg.-If-the-firing-of-the-rocket-brings-the-spaceship-to-a-halt,-what-is-the-velocity-of-the-rocket?

Question 6 (of 7)

 


Regular Physics Momentum Review: QR Challenge

https://www.classtools.net/QR/decode.php?text=7.-A-0.5-kg-air-track-glider-with-an-initial-speed-of-4-m/s-collides-with-another-similar-glider,-initially-at-rest.-If-the-struck-glider-moves-off-at-3-m/s,-how-much-Kinetic-Energy-is-lost-during-the-collision?

Question 7 (of 7)