1. what are the two main types of friction?
2. ______ friction is the amount of resistance to motion when an object is static or not moving.
3. ______ friction is the resistance on a moving object.
4. ______ friction is caused by a combination of the resistance due to the roughness of the surface and the molecular attractions trying to hold the sur-faces together.
5. once an object is moving, the amount of friction is ______ than when it was standing still.
6. ______ friction is primarily caused by the stickiness of the surfaces.

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Accepted Answer

### Question 1
# Brief Explanations:
In physics (a subfield of Natural Science), the two main types of friction are static friction (acting on non - moving objects) and kinetic friction (acting on moving objects).
# Answer:
Static and Kinetic

### Question 2
# Brief Explanations:
By the definition of static friction, it is the frictional force that opposes the start of motion, i.e., it is the resistance to motion when an object is at rest (static).
# Answer:
Static

### Question 3
# Brief Explanations:
Kinetic friction is defined as the frictional force that acts on an object that is in motion. It opposes the motion of the moving object.
# Answer:
Kinetic

### Question 4
# Brief Explanations:
Static friction has its origin in two factors: the microscopic roughness of the surfaces in contact (which leads to interlocking of surface irregularities) and the molecular attractions between the surfaces that tend to hold them together.
# Answer:
Static

### Question 5
# Brief Explanations:
Experimentally and theoretically, it is known that the magnitude of kinetic friction is generally less than the magnitude of static friction. Once an object starts moving, the frictional force acting on it (kinetic friction) is smaller than the static friction that was opposing the start of motion.
# Answer:
less

### Question 6
# Brief Explanations:
Static friction is related to the "stickiness" of the surfaces at a molecular level. The molecular attractions between the surfaces (which can be thought of as a form of stickiness) play a major role in static friction, especially in opposing the initiation of motion.
# Answer:
Static

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