Ch.3 Sec.1 Flashcards
Force
A push or a pull
A pressure applied forward or backward
Ex. Gravity
Friction
The force that opposes the sliding motion of two surfaces that are touching each other.
The pressure applied that opposes the sliding motion of two surfaces that are in contact
Ex. Welding or sticking
Sliding Force
Opposes the motion of two surfaces sliding past each other and is caused by microwelds constantly breaking and forming as the objects slide past each other.
Opposes the motion of two surfaces moving past each other and is created by microwelds which are constantly breaking and reforming as the objects move by each other.
Ex. Push a box with your friend
Gravity
An attractive force between any two objects that depends on the masses of the objects and the distance between them.
An attractive force between any two objects the relays on the masses of the objects and how far apart they are from each other.
Ex. One of the Four Basic Forces
Fundamental Forces
Four Basic Forces • Gravity • Electromagnetic Force • Strong Nuclear Force • Weak Nuclear Force
G = on earth
9.8 N/kg
G = in space
1.6 N/kg
Weight Equation
Weight (N) = mass (kg) • gravitational
strength (N/kg)
Fg = mg
Net Force
The sum of all of the forces acting on an object.
Forces acting on an object’s sum.
Ex. Like displacement
Static Friction
Prevents two surfaces from sliding past each other and is due to the microwelds that have formed between the bottom of the object.
Prevents two surfaces from moving past each other and is due to the microwelds that have been created between he bottom of the object
Ex. Applied Force and Statice Friction are the same
Rolling Friction
As a wheel rolls static fricken acts over the area where the wheel and surface are in contact.
As a wheel rolls static fricken goes over the part where the wheel and surface are touching.
Ex. Roller Blades
Traction
The action of drawing or pulling a thing over surface.
Drawing or pulling an object over a surface.
Ex. A car used traction on icy roads
Law of Universal Gravitation
In the 1660s British scientist Isaac Newton used data on the motions of the planets to find a relationship between the gravitational force between two objects, the objects’ masses, and the distance between them.
There was a scientist named Isaac Newton in the 1660s. He used data on the motions of the planets to find the relationship between gravitational force between two objects, the objects’ masses, plus the space between them.
Ex. F = G m1m2/d2
Weight
The gravitational force exerted on an object.
The force of gravity put on an object.
Ex. Cell Phone 1 N
Microwelds
The area where microscopic bumps on two surfaces stick together.
The place on two surfaces where they stick.
Ex. A table, cup
Field
A region of space that has a physical quantity at every point.
Physical quantity at every point which is a part of a religion of space.
Ex. Gravitational field
