What is a key characteristic of contact forces?

Understanding Forces in Physics

Interactive Video
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Physics, Science
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9th - 12th Grade
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Medium

Liam Anderson
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10 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
They do not involve any physical interaction.
They are always repulsive.
They require objects to be in contact.
They act over long distances.
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which of the following is an example of a long-range force?
Tension
Friction
Gravity
Normal force
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What causes tension in a wire or string?
Electromagnetic bonds between atoms
Gravitational pull
Magnetic attraction
Thermal expansion
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What happens when a wire is stretched by a heavy load?
The wire becomes shorter.
The electromagnetic bonds weaken.
The atoms and molecules try to restore their original positions.
The wire becomes electrically charged.
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the primary function of the normal force?
To pull objects together
To prevent objects from penetrating each other
To create friction
To generate heat
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is a challenge in defining whether two surfaces are in contact?
The electron clouds make it hard to define contact.
The surfaces are always at different temperatures.
The surfaces are always smooth.
The surfaces are always in motion.
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What contributes to the frictional force between two surfaces?
Smooth surfaces
Molecular bonds and surface roughness
High temperatures
Magnetic fields
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