At a food production site, four sealed bags are hung one at a time from a zeroed newtonmeter. Each bag hangs freely without touching another surface.
The gravitational field strength is 10 N kg-1.
| Bag | Mass of bag | Newtonmeter reading |
|---|---|---|
| A | 0.40 kg | 4.0 N |
| B | 0.80 kg | 8.0 N |
| C | 1.20 kg | 12.0 N |
| D | 1.60 kg | not recorded |
Each reading is the force on a bag caused by the Earth's gravitational field. State the name given to this force.
Use the results for bags A, B and C to state the relationship between the mass of a bag and its newtonmeter reading.
The reading for bag D was not recorded. Calculate the reading expected for bag D.