Force
The sum of all the forces acting on an object.
What is net force?
This is the force that opposes the sliding motion of two surfaces that are touching each other.
What is friction?
True or false: There is gravity in space
What is true?
The tendency of an object to resist any change in its motion.
What is inertia?
This is a friction-like force that opposes the motion of objects that move through the air.
What is air resistance?
This happens to the motion of an object when you exert a force on it.
What is the motion of the object will change?
If friction could be removed, an object in motion would do this
What is continue to move in a straight line at a constant speed?
The gravitational force exerted on an object is this.
What is weight?
This is the way mass effects inertia.
The ________ the mass, the _________ the inertia.
What is the greater the mass, the greater the inertia?
When air resistance balances the force of gravity, the object falls at a constant speed called ______ ___________.
What is terminal velocity?
This is the type of friction that is caused by the attraction of atoms on two surfaces that are in contact.
An example of this is when it's challenging to move something heavy, like a refrigerator or a bookshelf.
What is static friction?
If you were no longer on Earth, ________ would remain the same, however _________ would change with gravity.
What are: mass and weight?
Newton's second law of motion relates these three things.
What are: mass, acceleration, and force?
A falling object is in this two-word state of being when the only force acting on it is gravity (think to the elevator example)
What is free fall?
When you have provided enough force to break the microscopic roughness between the two surfaces, this type of friction occurs.
What is kinetic friction?
The force of gravity between the objects depends on two things: 1) 2)
What are 1) the mass of the objects, and 2) the distance between the objects ?
To calculate the force an object exerts, you use this formula.
What is F = ma?
This is Newton's law that is demonstrated with the launching of a rocket.
What is Newton's third law of motion?
Give two examples of action-reaction force pairs and the forces that are witnessed between them (can be ones talked bout in class, or your own examples)
What are (could vary):
Bumper cars each moving backward
Canoe going forward as water is pushed backward
Bird flying forward as air is pushed backward
Jumping up as ground is pushed down
Describe why objects in free fall aren't actually weightless (use the elevator and scale example to help you with your response)
Key words to include: weight, gravity, mass
What is: Because you are in free fall, you no longer push on the scale, so the scale does not measure your weight, so your weight appears to be zero. However, gravity is still pulling down on you, so you still have a measure of gravitational pull on your mass.
Newton's third law of motion relates these two things.
What are actions and reactions?