# Print

## 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

• Bring these devices into the lesson.

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.

### Question

1. Where are the strongest magnetic forces on a magnet?at the poles
2. What is the measure of how difficult it is for charges to flow through a material?resistance
3. What is a reversing switch that rotates with the coil in an electric motor and reverses the direction of the current every half turn?commutator
4. What is the rate of change of velocity?acceleration
5. What is an object that appears to be in free fall seem to be?WEIGHTLESS
6. What is the study of the relationship among thermal energy, heat, and work?thermodynamics
7. What home-heating system uses a large tank for storing water heated by the sun?active solar system
8. What is the equation for Newton’s 2nd Law of Motion?F=MA
9. What is a coordinate system in which the positions of objects can be measured?frame of reference
10. What is the function of a generator?change mechanical energy into electrical energy
11. What is the difference in electrical potential energy between two places in a circuit?voltage
12. What is the buildup of charges on an object?static electricity
13. What is a very large discharge of static electricity?lightning
14. What is a combination of two or more devices that transform chemical energy into electrical energy?battery
15. What type of transformer increases voltage?step-up transformer
16. What explains the momentum of objects after a collision of two objects?THE LAW OF CONSERVATION OF MOMENTUM
17. What are wind and ocean currents formed by?convection
18. What home-heating system uses large windows on south side of building?passive solar system
19. What is the force that opposes the sliding motion of two surfaces that are touching each other?FRICTION
20. What is an object’s distance and direction from a determined position of an object?displacement
21. What type of current reverses direction in a regular pattern?alternating current
22. What is a device used to open and close an electric circuit?SWITCH
23. What is the transfer of electrons from a charged object to another object by direct contact?conduction
24. What is “to every reaction there is an equal and opposite reaction”?NEWTON'S 3RD LAW

### 8TH GRADE 2ND SEMESTER SCIENCE REVIEW: QR Challenge

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