Presentation is loading. Please wait.

Presentation is loading. Please wait.

Unit 5: Applications of Newton’s Laws

Published byCharity Juliet Hood Modified over 8 years ago

Similar presentations

Presentation on theme: "Unit 5: Applications of Newton’s Laws"— Presentation transcript:

1 Unit 5: Applications of Newton’s Laws
Physics Spring 2015

2 Agenda 4/14/15 Review Newton’s Law Quest FUN Lab HW: Complete FUN Lab
Retake policy and assignment FUN Lab Coefficient of friction HW: Complete FUN Lab

3 Agenda 4/15/15 Quest Curve: 30pts Retake WS and policy
Conclude the FUN Lab What did we learn? Lab Static Friction v. Kinetic Friction Notes: Friction Practice FUN equation HW: Complete Friction Problems 1

4 What did we learn from FUN Lab?
How are force of friction and normal force related? Which surface had more friction? Which surface had a greater slope? What does the slope tell us about the friction of the surface?

5 Coefficient of Friction
This is a measure of how much two objects stick together A greater µ means a greater amount of friction Friction and normal force are related by: Ff = µ * FN

6 Friction What keeps and object still? What keeps an object moving?
Is it more difficult to move an object from rest, or keep an object moving? Why??

7 Agenda 4/16/15 Collect FUN Lab Part II Discuss Lab
Notes: Kinetic v. Static Friction Practice: FUN equation HW: Complete Friction Problems 1

8 What happened in the lab?
Which surface had a higher coefficient of friction? (µ) Why do you think this was the case? Which required more force, getting the mass to move or to keep it moving? Why?

9 Kinetic v. Static Friction
Static Friction: the friction that exists between an object at rest and the surface it is in contact with. Kinetic Friction: the friction that exists between a moving object and the surface it is in contact with. The coefficient of static friction always greater than the coefficient of kinetic friction for the same surface. µ k < µ s

10 Agenda 4/17 Student Surveys: Complete either on phone or chromebook
Review FUN homework Homework check: FUN Lab: How does surface area effect friction?

11 Student Surveys Go to d155.org/clc
On the homepage click on the student survey link Login using the instructions Take the survey!

12 Surface Area How does surface area affect the friction on an object?
How do you know? Use your data.

13 Agenda 4/20/15 Announcements: Six Flags Permission Slips
Early or Late Bus?? Who used cash/check Quick Review before HW Quiz HW Quiz Surface Area and Friction Review for Friction Quest Tomorrow

14 Surface Area How does surface area affect the friction on an object?
How do you know? Think about the lab.

15 Surface Area Friction is dependent only of the normal force acting on an object and the coefficient of friction (stickiness) of the surface. Increasing surface area spreads out the frictional force evenly. Decreasing surface area puts all of the friction in one spot. Either way, they amount of friction remains the same.

16 Net Friction How much friction exists between two pieces of paper?
What about 10 pieces of paper? (Think about stacking paper) What about 125 pieces of paper??

17 Phone Book Demo Explain why this is happening?
Each book weighs 10N, the coefficient of static friction is What is the force of friction needed to pull the books apart if they are stacked? Each page weighs .01N the coefficient of static friction is the same, however there are 125 pages in each book. How much force is required to pull apart the books if all the pages are stacked together?

Download ppt "Unit 5: Applications of Newton’s Laws"

Similar presentations

No Strings Attached: Normal Forces, Force Vectors, Strings, Springs and Pulleys Chapter 6.1-6.3 Important Vocabulary: Normal Force Contact Force Tension.

No Strings Attached: Normal Forces, Force Vectors, Strings, Springs and Pulleys Chapter Important Vocabulary: Normal Force Contact Force Tension.
Chapter 10, Section 1 The Nature of Force Monday, March 8, 2010 Pages 312 -- 317.

Chapter 10, Section 1 The Nature of Force Monday, March 8, 2010 Pages
Do Now If you are sitting still in your seat on a bus that is traveling 100 km/h on a highway, is your body at rest or in motion? Explain your answer.

Do Now If you are sitting still in your seat on a bus that is traveling 100 km/h on a highway, is your body at rest or in motion? Explain your answer.
Forces Def – an action exerted on an object to change the object’s state of motion (resting or moving) Units: Newtons (N) Net force – total force on an.

Forces Def – an action exerted on an object to change the object’s state of motion (resting or moving) Units: Newtons (N) Net force – total force on an.
 Friction opposes motion  Friction is dependent on the texture of the surfaces  Friction is dependent on normal force motionfriction.

 Friction opposes motion  Friction is dependent on the texture of the surfaces  Friction is dependent on normal force motionfriction.
Newton’s Laws of Motion - 2. Multiple Objects – Example with m 2 > m 1 Draw free body diagrams for each object. In magnitude, a 1 = a 2.

Newton’s Laws of Motion - 2. Multiple Objects – Example with m 2 > m 1 Draw free body diagrams for each object. In magnitude, a 1 = a 2.
Physics 121 Topics: Course announcements Newton’s Law of Motion: Review of Newton’s First, Second, and Third Law of Motion Problem Solving Strategies Friction:

Physics 121 Topics: Course announcements Newton’s Law of Motion: Review of Newton’s First, Second, and Third Law of Motion Problem Solving Strategies Friction:
Forces and Friction Week of October 15th. What is a force?  A push or a pull exerted on an object in order to change the motion of the object; force.

Forces and Friction Week of October 15th. What is a force?  A push or a pull exerted on an object in order to change the motion of the object; force.
5.3 Friction and Normal Force pp. 119 - 123 Mr. Richter.

5.3 Friction and Normal Force pp Mr. Richter.
Aim: How can we calculate static and kinetic friction? A 3.5 kilogram box is being pulled to the right with a force of 15 newtons. The box is moving at.

Aim: How can we calculate static and kinetic friction? A 3.5 kilogram box is being pulled to the right with a force of 15 newtons. The box is moving at.
Friction. Static Friction f s - The force on an object that keeps it from slipping f s - The force on an object that keeps it from slipping f s = F push.

Friction. Static Friction f s - The force on an object that keeps it from slipping f s - The force on an object that keeps it from slipping f s = F push.
Chapter4 RESISTANCE. Friction Forces Friction - a force that opposes motion of two solids or a solid and a fluid Static Friction (F static ) - a force.

Chapter4 RESISTANCE. Friction Forces Friction - a force that opposes motion of two solids or a solid and a fluid Static Friction (F static ) - a force.
 Learning Objectives:  Explain the effects of friction on moving objects  Calculate the coefficient of sliding friction  Explain factors that may.

 Learning Objectives:  Explain the effects of friction on moving objects  Calculate the coefficient of sliding friction  Explain factors that may.
10/1 Friction  Text: Chapter 4 section 9  HW 9/30 “Block on a Ramp” due Friday 10/4  Suggested Problems: Ch 4: 56, 58, 60, 74, 75, 76, 79, 102  Talk.

10/1 Friction  Text: Chapter 4 section 9  HW 9/30 “Block on a Ramp” due Friday 10/4  Suggested Problems: Ch 4: 56, 58, 60, 74, 75, 76, 79, 102  Talk.
Forces Mass, Weight, and Friction. Weight Weight: force of gravity on an object - on Earth your weight is a direct measure of the planet’s force pulling.

Forces Mass, Weight, and Friction. Weight Weight: force of gravity on an object - on Earth your weight is a direct measure of the planet’s force pulling.
Phys. 121: Thursday, 11 Sep. ● Reading: Read ch. 7 for Tuesday. ● Written HW 3: Due by 5:00 pm today. ● Written HW 4: 6.17, 6.54, 7.8, 7.23, 7.26, and.

Phys. 121: Thursday, 11 Sep. ● Reading: Read ch. 7 for Tuesday. ● Written HW 3: Due by 5:00 pm today. ● Written HW 4: 6.17, 6.54, 7.8, 7.23, 7.26, and.
Unit 3 - Dynamics Introduction to Forces and Newton’s three Laws of Motion.

Unit 3 - Dynamics Introduction to Forces and Newton’s three Laws of Motion.
There are two types of friction. Both always oppose motion. When you pushed your book across the desk, it experienced a type of friction that acts on moving.

There are two types of friction. Both always oppose motion. When you pushed your book across the desk, it experienced a type of friction that acts on moving.
 In the absence of external forces, an object at rest remains at rest and an object in motion remains in motion with a constant velocity.  This law.

 In the absence of external forces, an object at rest remains at rest and an object in motion remains in motion with a constant velocity.  This law.
Force 10/31. LT: I will be able to apply Newton’s law of motion Vocabulary: Coefficient of friction Static friction Kinetic friction Review Homework Finish.

Force 10/31. LT: I will be able to apply Newton’s law of motion Vocabulary: Coefficient of friction Static friction Kinetic friction Review Homework Finish.

Similar presentations

Ads by Google