This is the force that opposes the motion of an object that touches another object as it moves
What is friction?
100
The scientist who laid out most of our current theory of motion until Einstein came along.
Who is Newton?
100
This is what is always the same between a force and its corresponding reaction force.
What is magnitude?
100
These three fundamental forces can ONLY exert a pull, NOT a push.
What are strong nuclear, weak nuclear, and gravitational?
200
An acceleration is a change in these aspects of an object's motion.
What is speed and direction?
200
This is the type of friction that LEAST opposes the motion of an object over a surface.
What is rolling friction?
200
This is another name for Newton's 1st Law of Motion.
What is the Law of Inertia?
200
This explains why action-reaction force pairs do NOT cancel each other out.
What is because they act on different objects?
200
This is the force that tries to push the positively charged protons in an atom's nucleus apart.
What is the electromagnetic force?
300
An instrument that can be used to measure forces.
What is a spring scale?
300
This is what is equal in magnitude to the force of gravity on an object when it has reached terminal velocity.
What is the force of air resistance?
300
According to Newton's 2nd Law, if we double an object's mass, it will take this many times or this fraction of the original force to accelerate that object the same amount.
What is two times?
300
This is how we calculate an object's momentum.
What is multiply its mass by its velocity?
300
This is the most influential fundamental force over long distances.
What is the gravitational force?
400
The SI unit of force.
What is a newton?
400
Air resistance is an example of this type of friction.
What is fluid friction?
400
This is the best way to describe the velocity of an object if no net force is acting on it.
What is constant?
400
In a closed system, this is what must be the same total for that system before and after a collision.
What is momentum?
400
An object orbiting a planet is pulled toward the center of that planet. This is another name for a center-directed force.
What is centripetal?
500
This is what what call the sum of all of the forces on an object.
What is net force?
500
Ignoring air resistance, this is the only force acting on an object in projectile motion.
What is gravity?
500
This is what we multiply an object's mass by to calculate its weight on Earth.
What is acceleration due to gravity or 9.81 m/s^2?
500
If a 1 kg ball rolling at 10 m/s strikes a 2 kg ball at rest, and after the collision the first ball stops, this is how fast the second ball must now be traveling.
What is 5 m/s?
500
This is something that satellites are not currently used for.