Newton

The newton is defined as:

$1\text{ N} = 1\text{ kg} \times 1\text{ m/s}^2$

It is also the weight of a 102 g mass on Earth (since $W = mg = 0.102 \times 9.8 \approx 1$ N).

Common forces in newtons: weight of an apple $\approx 1$ N, weight of a person $\approx 700$ N, thrust of a car engine $\approx 3000$ N.