Acontact force is a force which

a. can occur over long distance.

b. occurs when two objects are near enough to influence each other.

c. occurs when two objects are touching each other.

d. can occur over short distances.

A contact force is a force which  occurs when two objects are touching each other. (C)

A contact force is a force that occurs when two objects are touching each other.

C.occurs when two objects are touching each other.

Explanation:

In contact force, two objects need to touch each other for the force to happen. This force is ubiquitous and requires contact for the force to occur. It is responsible for most visible interactions to occur.  

Examples of contact forces include moving a couch, pushing a desk, kicking a ball, or pushing a car up a hill. In kicking a ball, the contact force happens with a short impulse, whereas while moving a vehicle, a person continuously applies the contact force.

the design of a ski jumping suit involves a trade-off between giving the skiers lift to get higher jumps and ensuring the skier does not face a lot of drag before the jump itself. an expansive suit may to lift the skier higher, but at the same time, it will also increase the air resistance. higher air resistance as the skier goes down the slope limits the speed of the jump. a big suit also increases the risk of losing balance or control, especially if there's a strong gust of wind. while technologically enhanced suits a lot, clothing is not the only factor in a ski jumper’s success. gathering speed while skiing down the slope, ensuring good speed on the ramp, and maintaining good body posture and form in the air all contribute to a ski jumper's success.