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QR Challenge: FORCES SUMMARY SCAVENGER HUNT

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. The word 'force' has many meanings in everyday conversation. In science, a force is a physical action. It is a push or a pull acting upon an object as a result of its interaction with another object.1.
2. When objects have forces acting on them they may begin to move, speed up, slow down or stop moving, change the direction of motion, change shape, or remain still.2.
3. Some forces make objects move because of a direct push or pull by another object. The objects have to touch each other or be in contact. These are called contact forces. Hitting a fly with a fly swat or hitting a hockey ball with a hockey stick are two examples of contact forces.3.
4. Some forces cause movement without contact or touching. These are called non-contact forces. An example is a mass hanging from a length of string. There is no contact force between the mass and the Earth - only gravity at a distance. The little chock that occurs when you scuff your feet on carpet and immediately touch a person is another example of electrostatic non-contact force.4.
5. One way to 'see' a force at work is to measure it. In a laboratory force is measured using a device called a spring balance. The unit used to measure forces is called the Newton. Its symbol is N. It is named after Sir Isaac Newton (1642-1727), who first described forces.5.
6. A spring balance (or newton meter) is a type of weighing scale. They are commonly used to measure the force exerted on an object. This force is usually measured in Newtons and is essentially the weight of an object. The weight of an object is a measurement of its mass x gravity (W=mg).Spring balances consist of a cylindrical tube with a spring inside. One end (the top) is usually fixed to an adjuster which can be used to calibrate the device. The other end is attached to a hook on which you can hang objects. As objects are added, the spring stretches and the resultant force can be read from the scale.6.
7. More than one force is acting on an object at any given time. These different forces (pushes or pulls) act in different directions, and may or may not be balanced. This may be represented in a diagram. The diagram shows arrows representing the forces, these are known as vectors. The direction of the arrow is the same as the direction of the force. Long arrows represent large forces, and short arrows represent smaller forces. The net force is the force that results when all the forces acting on an object are combined. If an object is stationery (not moving ) or moving at a steady aped in the same direction, the net force acting on the object is zero.7.
8. Friction is a force that happens whenever an object slides or rolls over something. Friction always acts opposite to the direction that the object is moving in and acts to slow down (friction always opposes motion). A bike will gradually come to a stop if it is not pedalled and a car eventually stops if the engine is turned off.8.
9. Some surfaces are very rough. If one rough surface is slid over another, the bumps and hollows of the other slow it down. Rough surfaces have a lot of friction. Smooth surfaces have bumps and hollows too, although their ‘roughness’ can often only be seen under a microscope. Even smooth surfaces will slow down if pushed or pulled across another surface.9.
10. Friction also causes heat to be generated. Rubbing hands on cold mornings generates heat through friction. In a car, this happens throughout the engine. The heat needs to be released through the radiator, otherwise the car would quickly overheat.10.
11. There are a number of ways to reduce friction. Lubrication - surfaces are lubricated with oil/grease to fill the hollows that cause friction. Polishing/waxing - makes a surface smooth by knocking off bumps that cause friction. Ball bearings - allow axles to move more freely by reducing friction, allowing faster speeds. Hovercraft - reduces friction by stopping the surfaces touching at all. It does this by squeezing a blanket of air underneath. The craft then loses contact with the ground.11.
12. Friction is the resistance to movement of one item traveling compared to another. Advantages of friction are: Automobile brakes employ friction just to stop the vehicle. It assists us in walking on the earth. Friction causes asteroids or stones to disintegrate throughout the atmosphere prior to actually approaching the entire planet (Earth).Disadvantages of friction are: Friction generates excessive heat, resulting in energy waste. A sum of investment is spent on avoiding friction as well as the mileage that it causes by adopting procedures such as lubricating. Because friction works in the reverse orientation of movement, it decreases the movement of shifting.12.

 


FORCES SUMMARY SCAVENGER HUNT: QR Challenge

https://www.classtools.net/QR/decode.php?text=The-word-'force'-has-many-meanings-in-everyday-conversation.-In-science,-a-force-is-a-physical-action.-It-is-a-push-or-a-pull-acting-upon-an-object-as-a-result-of-its-interaction-with-another-object.

Question 1 (of 12)

 


FORCES SUMMARY SCAVENGER HUNT: QR Challenge

https://www.classtools.net/QR/decode.php?text=When-objects-have-forces-acting-on-them-they-may-begin-to-move,-speed-up,-slow-down-or-stop-moving,-change-the-direction-of-motion,-change-shape,-or-remain-still.

Question 2 (of 12)

 


FORCES SUMMARY SCAVENGER HUNT: QR Challenge

https://www.classtools.net/QR/decode.php?text=Some-forces-make-objects-move-because-of-a-direct-push-or-pull-by-another-object.-The-objects-have-to-touch-each-other-or-be-in-contact.-These-are-called-contact-forces.-Hitting-a-fly-with-a-fly-swat-or-hitting-a-hockey-ball-with-a-hockey-stick-are-two-examples-of-contact-forces.

Question 3 (of 12)

 


FORCES SUMMARY SCAVENGER HUNT: QR Challenge

https://www.classtools.net/QR/decode.php?text=Some-forces-cause-movement-without-contact-or-touching.-These-are-called-non-contact-forces.-An-example-is-a-mass-hanging-from-a-length-of-string.-There-is-no-contact-force-between-the-mass-and-the-Earth---only-gravity-at-a-distance.-The-little-chock-that-occurs-when-you-scuff-your-feet-on-carpet-and-immediately-touch-a-person-is-another-example-of-electrostatic-non-contact-force.

Question 4 (of 12)

 


FORCES SUMMARY SCAVENGER HUNT: QR Challenge

https://www.classtools.net/QR/decode.php?text=One-way-to-'see'-a-force-at-work-is-to-measure-it.-In-a-laboratory-force-is-measured-using-a-device-called-a-spring-balance.-The-unit-used-to-measure-forces-is-called-the-Newton.-Its-symbol-is-N.-It-is-named-after-Sir-Isaac-Newton-(1642-1727),-who-first-described-forces.

Question 5 (of 12)

 


FORCES SUMMARY SCAVENGER HUNT: QR Challenge

https://www.classtools.net/QR/decode.php?text=A-spring-balance-(or-newton-meter)-is-a-type-of-weighing-scale.-They-are-commonly-used-to-measure-the-force-exerted-on-an-object.-This-force-is-usually-measured-in-Newtons-and-is-essentially-the-weight-of-an-object.-The-weight-of-an-object-is-a-measurement-of-its-mass-x-gravity-(W=mg).Spring-balances-consist-of-a-cylindrical-tube-with-a-spring-inside.-One-end-(the-top)-is-usually-fixed-to-an-adjuster-which-can-be-used-to-calibrate-the-device.-The-other-end-is-attached-to-a-hook-on-which-you-can-hang-objects.-As-objects-are-added,-the-spring-stretches-and-the-resultant-force-can-be-read-from-the-scale.

Question 6 (of 12)

 


FORCES SUMMARY SCAVENGER HUNT: QR Challenge

https://www.classtools.net/QR/decode.php?text=More-than-one-force-is-acting-on-an-object-at-any-given-time.-These-different-forces-(pushes-or-pulls)-act-in-different-directions,-and-may-or-may-not-be-balanced.-This-may-be-represented-in-a-diagram.-The-diagram-shows-arrows-representing-the-forces,-these-are-known-as-vectors.-The-direction-of-the-arrow-is-the-same-as-the-direction-of-the-force.-Long-arrows-represent-large-forces,-and-short-arrows-represent-smaller-forces.-The-net-force-is-the-force-that-results-when-all-the-forces-acting-on-an-object-are-combined.-If-an-object-is-stationery-(not-moving-)-or-moving-at-a-steady-aped-in-the-same-direction,-the-net-force-acting-on-the-object-is-zero.

Question 7 (of 12)

 


FORCES SUMMARY SCAVENGER HUNT: QR Challenge

https://www.classtools.net/QR/decode.php?text=Friction-is-a-force-that-happens-whenever-an-object-slides-or-rolls-over-something.-Friction-always-acts-opposite-to-the-direction-that-the-object-is-moving-in-and-acts-to-slow-down-(friction-always-opposes-motion).-A-bike-will-gradually-come-to-a-stop-if-it-is-not-pedalled-and-a-car-eventually-stops-if-the-engine-is-turned-off.

Question 8 (of 12)

 


FORCES SUMMARY SCAVENGER HUNT: QR Challenge

https://www.classtools.net/QR/decode.php?text=Some-surfaces-are-very-rough.-If-one-rough-surface-is-slid-over-another,-the-bumps-and-hollows-of-the-other-slow-it-down.-Rough-surfaces-have-a-lot-of-friction.-Smooth-surfaces-have-bumps-and-hollows-too,-although-their-‘roughness’-can-often-only-be-seen-under-a-microscope.-Even-smooth-surfaces-will-slow-down-if-pushed-or-pulled-across-another-surface.

Question 9 (of 12)

 


FORCES SUMMARY SCAVENGER HUNT: QR Challenge

https://www.classtools.net/QR/decode.php?text=Friction-also-causes-heat-to-be-generated.-Rubbing-hands-on-cold-mornings-generates-heat-through-friction.-In-a-car,-this-happens-throughout-the-engine.-The-heat-needs-to-be-released-through-the-radiator,-otherwise-the-car-would-quickly-overheat.

Question 10 (of 12)

 


FORCES SUMMARY SCAVENGER HUNT: QR Challenge

https://www.classtools.net/QR/decode.php?text=There-are-a-number-of-ways-to-reduce-friction.-Lubrication---surfaces-are-lubricated-with-oil/grease-to-fill-the-hollows-that-cause-friction.-Polishing/waxing---makes-a-surface-smooth-by-knocking-off-bumps-that-cause-friction.-Ball-bearings---allow-axles-to-move-more-freely-by-reducing-friction,-allowing-faster-speeds.-Hovercraft---reduces-friction-by-stopping-the-surfaces-touching-at-all.-It-does-this-by-squeezing-a-blanket-of-air-underneath.-The-craft-then-loses-contact-with-the-ground.

Question 11 (of 12)

 


FORCES SUMMARY SCAVENGER HUNT: QR Challenge

https://www.classtools.net/QR/decode.php?text=Friction-is-the-resistance-to-movement-of-one-item-traveling-compared-to-another.-Advantages-of-friction-are:-Automobile-brakes-employ-friction-just-to-stop-the-vehicle.-It-assists-us-in-walking-on-the-earth.-Friction-causes-asteroids-or-stones-to-disintegrate-throughout-the-atmosphere-prior-to-actually-approaching-the-entire-planet-(Earth).Disadvantages-of-friction-are:-Friction-generates-excessive-heat,-resulting-in-energy-waste.-A-sum-of-investment-is-spent-on-avoiding-friction-as-well-as-the-mileage-that-it-causes-by-adopting-procedures-such-as-lubricating.-Because-friction-works-in-the-reverse-orientation-of-movement,-it-decreases-the-movement-of-shifting.

Question 12 (of 12)