Question

part e
friction force is the opposition to the motion of surfaces sliding across each other. based on your observations, what is one factor that affects the amount of friction?
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part f
question
draw an arrow to represent the friction force.

Explanation:

Part E

One well - known factor affecting friction is the nature of the surfaces in contact (how rough or smooth they are). Rougher surfaces tend to have more friction as there are more irregularities that interlock or resist the sliding motion. Another factor is the force pressing the surfaces together (normal force); a greater normal force generally leads to more friction as it increases the interaction between the surface irregularities. For this answer, we can choose the nature of the surfaces (e.g., roughness) or the normal force. Let's take the roughness of the surfaces as an example. If a surface is rough, like sandpaper, and another surface slides on it, the friction will be higher compared to a smooth surface like ice.

Friction force acts in the direction opposite to the direction of motion (or the tendency of motion) of the object. So, if an object is moving to the right on a surface, the friction force arrow should point to the left, parallel to the surface, to show that it opposes the motion. If there is a diagram (even though not fully shown here), we would identify the direction of the object's motion (or intended motion) and draw an arrow in the opposite direction, along the surface, to represent friction.

Answer:

One factor that affects the amount of friction is the roughness (or smoothness) of the surfaces in contact. (Other valid answers could be the force pressing the surfaces together (normal force), the type of material of the surfaces, etc.)

Part F