Homework: Read and be prepared for a brief quiz Tomorrow

Slides:

Advertisements

Similar presentations

Elevator Forces. 100 kg Scenario: One mass hanging. What forces are acting on this mass? F g = w = mg =100 kg (10 m/s 2 ) FTFT This mass is not moving.

Advertisements

How can NASA provide a sensation of weightlessness without the expense and high risk of sending astronauts into space?

Do Now [until 9:05] 1. Finish evaluation of Miss Peet [if you didn’t get one on Thursday, hand in tomorrow] 2. Pass assessment forward (Evan Lysacek) 3.

Apparent Weight. Acceleration of Gravity  Objects that fall to the Earth all experience an acceleration.  The acceleration due to gravity is g = 9.8.

A force is defined as a push or a pull that acts on an object.

Gravity The force not the movie. Forces Force (N) is any influence that can change the trajectory, speed or shape of a body. Change in state of motion.

Aim: How can we explain the motion of elevators using Newton’s 2 nd law? Do Now: What is the acceleration of this object? m = 20 kg F = 150 N F = 100 N.

Determining “Apparent Weight” The Elevator Problem.

In this section you will:

Science Starter! John weighs 735 N on Earth. (a) What is John’s mass in kilograms? (b) What would John’s mass be on Mars where g = 3.8 m/s 2 ? (c) What.

Chapter 12: Forces and Motion

Physics Unit Four Forces that Affect Motion. Force A push or a pull. Measured in newtons with a spring scale. 1 newton (N) = 1 kg m/s 2 An apple weighs.

In this section you will:

Using Newton's Laws Describe how the weight and the mass of an object are related. Differentiate between actual weight and apparent weight. In this section.

Force of Gravity Pre-Lab Are the forces of gravity acting on the two students different? What is another term that means the force of gravity? Weight –

Mass and Weight. Sorry about the wait.

Objectives  Describe how the weight and the mass of an object are related.  Differentiate between actual weight and apparent weight.

Comparison of weight and mass mass – measure of the amount of material in an object -measure of an object’s inertia units – g, kg Measured by placing an.

RQ7 You are pushing a heavy refrigerator across a kitchen floor. The forces acting on the refrigerator include: A. gravity B. gravity and your pushing.

Weight: More Practice Enter very large or very small numbers into your calculator using the EXP button: EXP -26.

Law of universal Gravitation Section The force of gravity: All objects accelerate towards the earth. Thus the earth exerts a force on these.

Determining “Apparent Weight” The Elevator Problem.

Satellites & “Weightlessness”. “Weightlessness” What keeps a satellite in orbit? The centripetal acceleration is CAUSED by the Gravitational Force! F.

Newton’s 1 st Law of Motion, Weight & Applying Newton’s 2 nd Law Chapter 6.2 System.

Accelerated Motion. Newton’s Second Law of Motion (Law of Force)- Net force acting on an object causes the object to accelerate in the direction of the.

Apparent Weight The weight of an object is the force of gravity on that object. Your sensation of weight is due to contact forces supporting you. Let’s.

Weight & Normal Force Weight  The force of gravity on an object.

Forces in One Dimension Chapter 4 Physics Principles and Problems Zitzewitz, Elliot, Haase, Harper, Herzog, Nelson, Nelson, Schuler and Zorn McGraw Hill,

Weight vs. Apparent Weight Physics 11. Elevator:  When you enter the elevator and press the button, you feel the normal amount of your weight on your.

Newton’s 1 st Law: More Practice.

Section 2: Weight and Drag Force

Mass, Weight, and Gravity. Mass vs. Weight  Mass is a measurement of the amount of material something contains, while weight is the measurement of the.

Newton’s 1 st Law of Motion, Weight & Applying Newton’s 2 nd Law Chapter 6.2 System.

More About Force 3) When one object exerts a force on a second object, the second exerts an equal and opposite force on the first. F AB = -F BA.

Gravity What is gravity?. Gravity Gravity is a force between ALL objects! Gravity.

Application of Forces Objective: To apply Newton’s Laws of motion to analyze accelerated motion as it applies to a vertically accelerated object and.

Apparent Weight. Apparent Weight of an object is the reading on a ___________ scale when that object is placed on it.

Forces in Nature.

Dynamics 2 – Newton’s Second Law Mr. Jean

Force is part of an interaction

Determining “Apparent Weight”

Chapter 4 Objectives: 1) Define FORCE; including units.

Newton’s 1st Law of Motion, Weight & Applying Newton’s 2nd Law

Mass vs. Weight.

Aim: How can we apply Newton’s Second Law?

Apparent Weight.

Newton’s First Law of Motion

Force is part of an interaction

Weightlessness.

Weight Fg = mg Fg=weight m=mass g=acceleration due to gravity Ex: Calculate the weight of a 12 kg toy cart. What is the difference between weight and.

Newton‘s 3rd Law.

How can NASA provide a sensation of weightlessness without the expense and high risk of sending astronauts into space?

Newton’s Second Law How does mass affect acceleration? 2.How does mass

Gravity: A force with which to be reckoned.

Mass vs. Weight.

Exam I is Monday, September 26!!

Working with Forces Gravity, Apparent Weight & Hooke’s Law.

Comparison of weight and mass

Weightlessness.

Law of Universal Gravitation

Forces in One Dimension

A 700 N person stands on a bathroom scale in an elevator

DO NOW QUESTION Say you become an astronaut. Will you WEIGH more, less, or the same on the moon? Less Why? Because the moon has less gravity than Earth.

The Problem With The Elevators

Newton’s 1st Law: More Practice

Weight Fg = mg The weight of an object is equal to the mass of an object multiplied the acceleration due to gravity (gravitational field value) (9.81 N.

Aim: How do we explain the normal force?

Relating Gravitational Field Strength to Gravitational Force

Using Newton’s Laws.

Presentation transcript:

Homework: Read 4.6-4.9 and be prepared for a brief quiz Tomorrow Mass vs. Weight Homework: Read 4.6-4.9 and be prepared for a brief quiz Tomorrow

Relationship between Mass and Weight Mass and weight are related, but they are not the same. Fw = mg Ex. : Fw = (2 kg)(-10 m/s2) = -20 N In words: The force of weight equals mass times the acceleration due to gravity

Mass vs. Weight You will be able to differentiate between mass and weight… Apparent weight – force exerted by a scale Weightlessness – an apparent weight of zero W = Fg = mg

mass Weight 1 kg = 10 N

Example Problem: Your mass is 75 kg. You stand on a scale in an elevator that is going up at 2.0 m/s2. A) What is your weight (before entering the elevator)? B) What is your apparent weight (on the elevator? C) Is this larger, smaller, or equal to your weight at rest?