Question

Frank's weight is 800 Newtons and his bike's weight is 2500Newtons. What upwards force is exerted by the road on his back wheel?

Answer 1

According to the Newton's third law, the force exerted by the road is equal to the total weight of the Frank and his bike. Thus:

$$N = 800N+2500N = 3300N$$

Answer. $N = 3300N$.