# Overview of Forces & Gravity Flashcards

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The force of gravity on an object

Equal to mass (in kg) times acceleration of gravity (in m/s2)

Standard units = Newtons

The amount of matter an object has

Vector quantity represented by *g*

Is equal to -9.8 m/s2

Negative value because pointing down

Force = -spring constant * extension in meters

5 cm = 0.05 m

50 N = -*k* * -0.05 m

*k* = 1,000 N/m

Represented by *μs*

Dependent on materials of objects in contact

Constant speed, so net force = 0 and applied force = force of friction

Force of sliding friction = coefficient of sliding friction * mass * acceleration of gravity

50 = *μs* * 10 * 9.8

*μs* = 0.51

Static friction: the force that opposes the motion of a stationary object

Kinetic friction: the force that opposes the motion of an object in motion

Static > kinetic

The contact force pushing up from a surface onto an object that is in contact with the surface

The force is perpendicular to the surface

A push or pull by an object onto another object

Vector quantities: have magnitude and direction

Standard unit: Newton (N)

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## Flashcard Content Overview

The flashcards in this set will give a general overview of forces and gravity. They will describe the types of forces that act on stationary and moving objects and how these can be shown on free-body diagrams. They focus especially on gravity, and how gravity affects objects on Earth.

A push or pull by an object onto another object

Vector quantities: have magnitude and direction

Standard unit: Newton (N)

The contact force pushing up from a surface onto an object that is in contact with the surface

The force is perpendicular to the surface

Static friction: the force that opposes the motion of a stationary object

Kinetic friction: the force that opposes the motion of an object in motion

Static > kinetic

Constant speed, so net force = 0 and applied force = force of friction

Force of sliding friction = coefficient of sliding friction * mass * acceleration of gravity

50 = *μs* * 10 * 9.8

*μs* = 0.51

Represented by *μs*

Dependent on materials of objects in contact

Force = -spring constant * extension in meters

5 cm = 0.05 m

50 N = -*k* * -0.05 m

*k* = 1,000 N/m

Vector quantity represented by *g*

Is equal to -9.8 m/s2

Negative value because pointing down

The amount of matter an object has

The force of gravity on an object

Equal to mass (in kg) times acceleration of gravity (in m/s2)

Standard units = Newtons

A pulling force between two objects with mass

Strength dependent on mass of and distance between the objects

They both hit the floor at the same time.

*W* = *m* * *g*

490 N = *m* * 9.8 m/s2

*m* = 50 kg = 110 lb

*g* = *G * M / R2*

*G* is universal gravitational constant

*M* = mass

*R* = distance

*g* = *G * M / R2*

*g* = 6.67 * 10-11 * 1/5 * 5.979 * 1024 / (6.376 * 106)2 = 1.96 m/s2

*F* = *G (m1 * m2) / r2*

*G* = universal gravitational constant

*m1* and *m2* = the masses of the two objects

*r* (or *d*) = distance between the objects (or the radius of a planet)

190,000 km = 1.9 * 108 m

*g* = *G * M / R2*

*g* = 6.67 * 10-11 * 5.979 * 1024 / (1.9 * 108 + 6.376 * 106)2 = 0.0103 m/s2

Occurs when an object is moving with gravity as the only force acting on it

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Physics 101: Intro to Physics20 chapters | 167 lessons | 11 flashcard sets

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