Force Vectors and Equilibrium

Slides:

Advertisements

Similar presentations

Velocity v= v0 + at Position x = x0 + v0t + ½ at2 FORCES

Advertisements

Aim: How can we describe resultant force (net force)?

Newton’s Laws.

Make a sketch Problem: A 10.0 kg box is pulled along a horizontal surface by a rope that makes a 30.0 o angle with the horizontal. The tension in the rope.

Writing Force Equations. Writing force equations 1.Draw a FBD to identify all forces and the directions they act 2.Write an equation to sum up the horizontal.

Do Now: 1. Draw a free body diagram (all the forces) acting on a water skier being pulled by a boat. 2. What is the net force acting on this object?

An Introduction to Statics Unit 3, Presentation 4.

Examples from Chapter 4.

Dynamics the branch of mechanics that deals with the motion and equilibrium of systems under the action of forces, usually from outside the system. 40S.

PAP Physics. Unit is the NEWTON(N) Is by definition a push or a pull Can exist during physical contact (Tension, Friction, Applied Force) Can exist with.

Newton’s Second Law Honors Physics. N.S.L. "The acceleration of an object is directly proportional to the NET FORCE AND inversely proportional to the.

Resolving the gravitational forces on an inclined plane

Warm Up A ski hill has a slope of 40 degrees. If the coefficient of friction between a skier’s skis and the snow is 0.1 what will be the acceleration of.

Notes: Tuesday Oct. 8, 2012 Topic: Dynamic Equilibrium and Vectors EQ: How can we describe the rope example from yesterday using drawings?

Applications & Examples of Newton’s Laws. Forces are VECTORS!! Newton’s 2 nd Law: ∑F = ma ∑F = VECTOR SUM of all forces on mass m  Need VECTOR addition.

A conical pendulum is formed by a mass of 100 g (0.1 kg) moving in a circle as shown. The string makes an angle of 30 o. 1.Draw the free body force diagram.

Newton’s first and second laws Lecture 2 Pre-reading : KJF §4.3 and 4.4.

Free Body Diagrams. Weight Free Body Diagrams Net Force Present.

Module 1.1 – Displacement and Velocity Vectors

EQUILIBRIUM The sum of the forces is zero. The acceleration is zero. ΣF = 0 a=0.

MCV4U1 Vectors 4.3 Applications Of Vectors - Force Problems.

Basic Info: balanced Forces Objects are balanced only if their net force is zero in both the vertical and horizontal directions Objects are balanced only.

1.1.1 Newton’s first law.

Newton’s 1st Law of Motion:

Free Body Diagrams and Newton’s Laws

Forces & Free Body Diagrams

Forces, Newton’s First & Second Laws AP Physics 1.

Making Pretty Pictures

Mary pulls on a lawnmower parallel to the ground

Do Now: 1. How does a Newton’s Cradle represent all 3 of Newton’s Laws of motion? Explain for each law!

Free Body diagrams and problem solving

Newton’s Laws.

Physics 13 General Physics 1

Applications of Newton’s Laws Tension and Pulleys

Newton’s Laws.

Newton’s Laws.

Free Body diagrams and problem solving

Free Body diagrams and problem solving

Newton’s First Law Pre-AP Physics.

Forces on an inclined plane

Translational Equilibrium

Newton’s Laws.

Newton’s Laws.

Forces in Two Dimensions

Ch. 5 slides.ppt Forces.ppt.

Newton’s First & Second Law

Free Body Diagrams at an Angle

Newton’s Laws.

Static Equilibrium Question: What is the direction of a third force, so that the shoe does not go anywhere?

Unit is the NEWTON(N) Is by definition a push or a pull Can exist during physical contact(Tension, Friction, Applied Force) Can exist with NO physical.

Unit is the NEWTON(N) Is by definition a push or a pull Can exist during physical contact(Tension, Friction, Applied Force) Can exist with NO physical.

Newton’s First & Second Law

Newton’s Laws.

Newton’s First & Second Law

Newton’s First & Second Law

Newton’s 1st Law of Motion:

Chapter 6 – Forces in Motion

Newton’s Laws.

Definition A force is a push or pull on an object.

Newton’s Laws.

Applying Forces AP Physics 1.

Coverage of the 1st Long test

Newton’s First & Second Law

5.3 Net Force and Equilibrium

Equilibrium For Coplanar Forces

5.3 Net Force and Equilibrium

Applying Forces AP Physics C.

Newton’s Laws.

Presentation transcript:

Force Vectors and Equilibrium Dynamics Unit

Forces at an Angle So far we have worked with forces acting vertically or horizontally but not at an angle When forces act at an angle, we need to find x and y components of the forces

Example The two people pull the boat onto the beach using two ropes. Person A pulls with 60N at 24° N of E and Person B pulls at 60N at 24° S of E. Determine the net force acting on the boat.

Free Body Diagram

Determine components for each force.

Find the sum of x components and the sum of y components.

Use the sum of the components to calculate an Fnet solution Use the sum of the components to calculate an Fnet solution. Remember to determine direction. 110N [E]

Example 2: Two people are pulling a box along the ground. Person A pulls with 300 N at 30.0 degrees above the horizontal and Person B pulls with 250 N at 25.0 degrees below the horizontal. If the force of friction between the ground and the box is 100 N at 0 degrees to the horizontal, use a FBD to determine the net force acting on the box.

1. Free Body Diagram

2. Determine components from each force. Person A Components Person B Components

3. Sum the components. Don’t forget to include friction in the horizontal. Sum of x Components (including Friction) Sum of y components

Draw a new diagram The net force is 388N at an angle of 6.55 degrees above the horizontal.

Equilibrium when the net force on an object is zero, the object is in equilibrium (not accelerating) The sum of all forces in the x direction must add to zero The sum of all forces in the y direction must add to zero

Example: A 20.0 kg object is suspended as shown. Determine the tension in rope 2.

Free Body Diagram

Example: A 65 kg object is suspended as shown below. Calculate the two forces required in order to suspend the object.

Free Body Diagram

Solution

Assignment