Mass, Weight, and Gravity - PowerPoint PPT Presentation

About This Presentation
Title:

Mass, Weight, and Gravity

Description:

Mass, Weight, and Gravity IP 670 Turn to a partner and discuss What is mass? Mass is the amount of matter in an object. a measure of the inertia of an object ... – PowerPoint PPT presentation

Number of Views:90
Avg rating:3.0/5.0
Slides: 20
Provided by: KimM45
Category:
Tags: gravity | mass | motion | weight

less

Transcript and Presenter's Notes

Title: Mass, Weight, and Gravity


1
Mass, Weight, and Gravity
  • IP 670

2
Turn to a partner and discuss
  • What is mass?

3
Mass is
  • the amount of matter in an object.
  • a measure of the inertia of an object.
  • measured in units of kilograms.
  • constant everywhere.
  • No matter where I take you, your mass doesnt
    change.

4
Turn to a new partner and discuss
  • What is inertia?

5
Inertia is
  • a property of matter.
  • a measure of an objects resistance to changes in
    its motion.
  • resistance to changes in speed and/or direction.
  • directly proportional to an objects mass.
  • more massive objects have more inertia.

6
Turn to another partner and discuss
  • What is the force of gravity?

7
The Force of Gravity is
  • the force of attraction which any two objects
    that have mass exert on each other.
  • only noticeable when at least one of the objects
    has a very, very large mass.
  • When dealing with situations on Earth, we are
    only interested in the gravitational force that
    Earth exerts on objects.

8
Newtons Law of Universal Gravitation
9
Newtons Law of Universal Gravitation
  • Three Things for you to know
  • bigger if the objects have more mass.
  • smaller if the objects are farther apart.
  • universal. It applies to ANY two objects which
    have mass.

10
Why is gravity so special?
  • It is universal.
  • It does not require contact.
  • It is poorly understood.
  • Note When people say gravity they typically
    mean the force of gravity. Remember that we are
    talking about a force.

11
One more partner question
  • What is weight?

12
Weight is
  • another name for the force of gravity which the
    planet exerts on an object near its surface.
  • We typically speak of our weight on Earth so we
    are talking about the force of gravity that the
    Earth exerts on us.
  • a force.
  • dependant on BOTH your mass and the planet which
    you are on or near.

13
Weight Calculations
  • To calculate weight, use the following formula
  • Weight force of gravity (in Newtons)
  • m mass (in kilograms)
  • g acceleration due to gravity
  • depends on the planet and the exact location.
  • On Earth, g 10 m/s2

14
Question 1
  • Determine the weight (in Newtons) of a 64 kg
    object on planet Earth.

15
Question 2
  • Determine the mass (in kilograms) of an object
    which weighs 200 N on planet earth.

16
True and False
  • More massive objects have more inertia than less
    massive objects.
  • If the forces acting upon an object are balanced,
    then it must be at rest.
  • On Earth, the force of gravity acting upon an
    object is 10 times the weight of the object.

T
F
F
17
More True and False
  • Inertia is a force which acts upon objects at
    rest.
  • A feather and an elephant will have the same
    weight within a vacuum.
  • If you stand on a bathroom scale and bounce, the
    scale reading changes. This means that you weigh
    differently ( more or less) than if you were to
    standing at rest.

F
F
F
18
More True and False
  1. More massive objects have the same inertia as
    less massive objects yet more massive objects
    will weigh more.
  2. The weight of an object can be expressed in units
    of kilograms or grams.
  3. Weight and mass are the same thing it's just
    that they have different values on different
    planets.

F
F
F
19
More True and False
  • You and your lab partner will experience a force
    of gravitational attraction when standing next to
    each other.

T
Write a Comment
User Comments (0)
About PowerShow.com