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**1. What have I done wrong when I set this GCSE question?! (shortened)**

Gravity: 10 N/kg

Bowling ball: weight 10 N, air resistance 0.05 N, overall force 9.95 N

Football: mass 0.5 kg, air resistance 0.05 N

Students need to work out:

- effective force on the football (4.95 N)
- bowling ball (a = F/m = 9.95 / 1 = 9.95 N/kg)
- football (a = F/m = 4.95 / 0.5 = 9.9 N/kg)

## Homework Equations

F = ma, W = mg

## The Attempt at a Solution

I have played around with it and I'm missing something, help!