Question

1. which of the following does not describe a force: a something that speeds up or slows down an object b something that causes an object to change direction c something that causes an object to exchange matter d something that immediately stops any object 2. what is the difference between contact and non - contact forces? a there is physical touching between the object and the force in contact but not in non - contact b there is physical touching between the object and the force in non - contact but not in contact c there is no difference, they are both the same d all of the above

Explanation:

1. Force is defined as something that can change the motion (speed up, slow down, change direction) of an object. Exchanging matter is not related to the concept of force. And a force doesn't always immediately stop an object.
2. Contact forces require physical - touching between the object and the source of the force, while non - contact forces act without physical touching.

Answer:

1. C. Something that causes an object to exchange matter
2. A. There is physical touching between the object and the force in contact but not in non - contact