Question

a force is a ______.
options: push, pull, push or pull, none of the above
starting from home, jason walks 10 meters east, then turns around and walks 10 meters west. which of the follow describes jason’s motion?
check all that apply.
options: jason’s distance is 20 meters, jason’s displacement is 20 meters, jason’s distance is 0 meters, jason’s displacement is 0 meters
which of the following are true about friction?
check all that apply.
options: objects not sliding past each other have kinetic friction, objects not sliding past each other have static friction, rolling friction is greater than sliding friction, rolling friction is less than sliding friction

Explanation:

First Question (Force Definition)

In physics (subfield of Natural Science), a force is defined as a push or pull on an object. So the correct option is "push or pull".

Step1: Calculate Distance

Distance is the total path length. Jason walks 10 m east and 10 m west, so total distance is $10 + 10 = 20$ meters.

Step2: Calculate Displacement

Displacement is the straight - line distance from the start to the end point. Jason starts at home, walks 10 m east and then 10 m west, so he ends up at home. Displacement is $10 - 10 = 0$ meters.

• Static friction acts on objects that are not sliding past each other (to prevent motion), while kinetic friction acts on sliding objects. So "objects not sliding past each other have static friction" is correct, and "objects not sliding past each other have kinetic friction" is wrong.
• Rolling friction is generally less than sliding friction (e.g., it's easier to roll a wheel than to slide it). So "rolling friction is less than sliding friction" is correct, and "rolling friction is greater than sliding friction" is wrong.

Answer:

C. push or pull

Second Question (Motion: Distance and Displacement)