Calculating Friction Using Spring Balance

Q. Spring balance can be used to measure the frictional force?

1. True
2. False

Q. Sanjana performed an experiment to find the amount of force needed to move a 1 kg block over four different surfaces - wood, sandpaper, concrete and glass. Which of these will show minimum reading?

1. Wood
2. Sandpaper
3. Concrete
4. Glass