What friction acts on objects that are not moving?
100
The law universal gravitation states that the force of gravity acts between all objects in the universe. This means that any two objects in the universe, without exception, attract each other.
What is the law of universal gravitation?
100
A rocket can rise into the air because the gases it expels with a downward action force exert an equal but opposite reaction force on the rocket.
How do rockets go up?
100
Newton's first law of motion states that an object at rest will remain at rest, and an object moving at a constant velocity will continue moving at a constant velocity, unless it is acted upon by an unbalanced force.
What is Newton's first law?
200
rolling friction
What friction rolls across a surface?
200
mass and distance
What two factors affect the gravitational attraction between objects?
200
A satellite is any object that orbits another object in space.
What is a satellite?
200
According to Newton's second law motion, acceleration depends on the object's mass and on the net force acting on the object.
What is Newton's second law?
300
fluid friction
Which friction moves through fluid?
300
Mass is a measure of the amount of matter in an object; weight is a measure of the gravitational force exerted on an object.
What is the different between mass and weight?
300
Any force that causes an object to move in a circular path is centripetal force.
What is a centripetal force?
300
Newton's third law of motion states that if one object exerts a force on another object, then the second object exerts a force of equal strength in the opposite direction on the first object.
What is Newton's third law?
400
sliding friction
Which friction occurs when two solid surfaces slide over each other?
400
When the only force acting on an object is gravity, the object is said to be in free fall.
What is free fall?
400
Satellite in orbit around Earth continuously fall toward Earth, but because Earth is curved they travel around it.
Why doesn't a satellite fall to Earth?
400
Inertia is the tendency of an object to resist a change in motion.
What is inertia?
500
Objects falling through air experience a type of fluid friction called air resistances.
What is air resistances?
500
Some satellites, such as mapping and observation satellite, are put into low orbits of less that 1,000 kilmeters
Where are some satellites located?
500
The law of conservation of momentum states that, in the absence of outside forces, the total momentum of objects that interact does not change.