When Nicole pushes the bike up a hill we know there is a friction force between hill and bike then due to this friction force It will have to push harder to move it upwards along the hill.
So this type of friction force during uphill is a type of contact force which is present of the bike.
Apart from this there are also few non contact force between bike and its surroundings
One of the force is gravitational force of Sun and Earth on the bike while will act towards their centers.
This force is a field force and it do not require any contact with the bike
So here correct answer would be
<em>They both experience contact forces. They both experience non-contact forces. </em>
