Spot the outsider in each trio

Exercise and reference answers

Questions

1. Items

   1. Friction
   2. Gravity
   3. Spring force

   Odd item

   Friction

2. Items

   1. Joule
   2. Watt
   3. Kilowatt hour

   Odd item

   Watt

3. Items

   1. Work
   2. Kinetic energy
   3. Force

   Odd item

   Force

4. Items

   1. mv2/2
   2. mgh
   3. kx2/2

   Odd item

   mv2/2

Instructions

Tap the one item in each trio that does not belong with the other two.

Explanation