Show:
Chapter 1-a
Chapter 1-b
Chapter 1-c
Chapter 1-d
Chapter 2-a
100
What is a force?
A push or pull on an object
100
What is air resistance?
A fluid friction force on objects in free fall opposite the force of gravity
100
What is in the middle?
Sliding
100
What is static friction?
The friction force that acts on objects that are not moving
100
What is Newton's 1st law of motion?
An object in motion stays in motion unless an outside force acts on it, and an object at rest stays at rest unless an outside force acts on it
200
What is the difference between balanced and unbalanced forces?
Balanced force: no acceleration Unbalanced force: acceleration
200
What is terminal velocity?
When air resistance equals gravity, objects fall at an end speed. This is terminal velocity
200
Is air resistance an upward or downward force?
Upward
200
What is sliding friction?
friction force that opposes the motion of an object as it slides over a surface (keeps something from sliding as if it were on ice
200
What is inertia?
An object's ability to resist a change in motion
300
What is friction?
A force caused when two objects pass each other
300
What is projectile motion?
The combination of initial forward velocity combined with gravity results in a curved path
300
What is net force?
The overall force acting on an object
300
What is rolling friction?
friction force on rolling objects (wheels, balls)
300
What is Newton's second law of motion?
Acceleration=netforce/mass A=f/m
400
What are the four types of friction?
Static friction, sliding friction, rolling friction, and fluid friction
400
What is the strongest of static, rolling, and sliding friction?
Static
400
What is the unit for force?
Newtons
400
What is fluid friction?
friction force in a fluid (air, water)
400
What is the unit for acceleration?
Meters per second squared
500
What is gravity?
A force pulling objects towards Earth's center
500
What is the weakest of the 3?
Rolling
500
What is a newton?
The amount of force that causes 1 kg of mass to accelerate at a rate of 1 meter per second squared
500
If you drop and throw an object which will hit the ground first?
They'll hit at the same time
500
What happens to the acceleration if you double the force?
The acceleration doubles