Forces
Gravity and Friction
Newton's Laws
Momentum
Rockets and Satellites
100
A push or a pull
What is force?
100
This force depends on the type of surfaces involved and how hard the surfaces push together.
What is friction?
100
This is the tendency of an object to resist change. (How hard it is to make something move by pushing or pulling it.)
What is inertia?
100
The product of an object's mass and velocity. (How hard it is for something that is moving to stop.)
What is momentum?
100
An object that travels around the Earth.
What is a satellite?
200
The SI unit for force
What is a newton?
200
This is the force that pulls falling objects towards Earth.
What is gravity?
200
The greater this of an object, the greater its inertia.
What is mass?
200
The momentum of an object is in the same direction as this.
What is its velocity?
200
This is an example of a satellite.
What is the moon?
300
The overall force on an object after all the forces are added together.
What is net force?
300
An object that is thrown.
What is a projectile?
300
This law states that acceleration depends on the object's mass and the net force acting on the object.
What is Newton's second law of motion?
300
You can do this to an object's momentum by increasing its mass. (Remember the semi truck and Volkswagen Beetle!)
What is increase it?
300
Any force that causes an object to travel in a circle.
What is centripital force?
400
These do not change an object's motion.
What are balanced forces?
400
Friction acts in this direction to an object's motion.
What is opposite?
400
This law states that for every action, there is an equal but opposite reaction.
What is Newton's third law of motion?
400
According to this, when two objects collide in the absence of friction, momentum is not lost.
What is the law of conservation of momentum?
400
The achievement of lifting a rocket off of the ground and into space can be explained by this.
What is Newton's third law of motion?
500
These result in a change in the object's motion.
What are unbalanced forces?
500
This is a type of friction that objects experience as they fall through the air.
What is air resistance?
500
If an action force of a bat striking a ball accelerates the ball in one direction, this accelerates the bat in the opposite direction.
What is reaction force?
500
The total momentum of a group of objects is conserved, unless this happens.
What is outside forces act on the objects?
500
This is required to be greater than Earth's gravity for a rocket to lift off into space.
What is thrust?
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