Forces
push and pull
What are basic forces?
A change in position over time
What is motion?
Static friction, sliding friction, rolling friction, and fluid friction
What are frictional forces?
A force that exists between any two objects that have mass
What is gravity?
A soccer ball slows on a grassy field
What is the result of frictional forces?
Gravity, friction, and magnetism
What are the major forces that affect motion?
The ability to do work
What is energy?
A force is applied but the objects are not moving
What is static friction?
What is weight?
Example: adding sand on an icy bridge
What would increase friction?
What are frictional forces?
DAILY DOUBLE
Gravity, friction, and magnetism
What are forces that affect motion?
A force is applied and an object is sliding on another while this force is acting against the applied force
What is sliding friction?
Gravity pulls objects toward the center of Earth due to Earth’s mass
How does gravity work?
Example: ice on a paved road
What might decrease the amount of friction?
Gravity
What is a force that impacts all other forces?
An object will resist motion when a force is applied
What is the relationship between two objects and static friction?
A force is applied and an object is rolling on another while this force is acting against the applied force
What is rolling friction?
560N on the earth and 90N on the moon
What is the difference of weight on the moon and the earth for an object with the same mass (56kg)?
The crumpled paper because of air resistance
Which falls to the ground faster, crumpled paper or the same piece of paper not crumpled? Why?
Newton's Laws
What are the explanations of all forces that create motion?
speed
This frictional force has the least resistance and, although it opposes applied forces, objects seem to move easiest
What is fluid friction?
The hammer and the feather would fall at the same rate as the force of gravity is the same on all objects
Which object would fall faster with the absence of atmosphere (air resistance)?
DAILY DOUBLE
A person continues to move although the car has come to an abrupt stop
What is an example of inertia?