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1 of 9© Boardworks Ltd 2010
2 of 9© Boardworks Ltd 2010 What are forces?
3 of 9© Boardworks Ltd 2010 Push and pull
4 of 9© Boardworks Ltd 2010 Force Forces come in pairs Forces have a magnitude (measured in Newtons) and a direction Forces are often represented with arrows that show the direction and magnitude 5N, north (up) Magnitude: 5N Direction: north (up)
5 of 9© Boardworks Ltd 2010 All forces involve interactions between objects. There are several different types. Types of forces What forces are acting during this rocket launch? All types of forces can occur whether objects are still or moving. Gravity and magnetism are forces that can act over distances. Friction and upthrust are forces that involve direct contact between objects.
6 of 9© Boardworks Ltd 2010 There are two wind machines applying forces to the ice skater. The forces acting on the skater are equal in magnitude and opposite in direction. Balanced forces The forces are balanced, so they cancel each other out. The skater does not move. Balanced forces do not cause a change in motion.
7 of 9© Boardworks Ltd 2010 Unbalanced forces Unbalanced forces are forces that are not equal in size or are not opposite in direction Unbalanced forces lead to a change in speed or direction. What if only one wind machine is blowing on the skater? The forces acting on her are no longer balanced so she will start to move to the left. Her speed will change – this is called acceleration.
8 of 9© Boardworks Ltd 2010 Balanced Forces The ship is floating on the water, the forces are balanced. Which forces are acting on the ship? Gravity (Water’s) Upthrust Because Gravity and Upthrust are equal the ship stays afloat.
9 of 9© Boardworks Ltd 2010 Balanced Forces The vase is resting on the table. It is not moving, therefore the forces must be balanced. Which forces are acting on the vase? Gravity Table’s Upthrust Have a look around the classroom and name some of the balanced forces in action on different objects.
10 of 9© Boardworks Ltd 2010 Unbalanced Forces The man and the parachute are slowly falling to the ground. Which forces are acting on the parachute? Which force is bigger? How can you tell? Gravity is pulling the man to the ground Air resistance is pushing upwards Gravity is the bigger force. We can tell this because the direction of movement of the man and the parachute is the same as the direction of the force of gravity.
11 of 9© Boardworks Ltd 2010 Unbalanced Forces The same forces are acting on the elephant but without a parachute there is much less air resistance. Gravity is pulling to the ground Air resistance is pushing upwards Gravity is a much bigger force. Because there is a bigger difference between the force pulling downwards and the force pushing upwards the elephant falls much more quickly than a man with a parachute.
12 of 9© Boardworks Ltd 2010 Unbalanced Forces The paperclip is jumping up to the magnet. Which forces are acting on the paper clip? Which is the greater force? The magnetic force is pulling the paperclip upwards Gravity is pulling the paperclip to the ground The magnetic force is greater than the force of gravity therefore the paperclip moves in the direction of the biggest force.
13 of 9© Boardworks Ltd 2010 Unbalanced Forces 5 N, right + 10 N, right =15N, right
14 of 9© Boardworks Ltd 2010 Forces Each team is exerting a force – what happens if the pulling force produced by each team is equal? What would happen if the team on the left were able to produce a bigger pulling force than the team on the right?
15 of 9© Boardworks Ltd 2010 Force pairs
16 of 9© Boardworks Ltd 2010 500 N Imagine a car traveling at a constant speed of 50 km/h. Balanced and unbalanced forces The engine provides sufficient force to balance all the frictional forces that are acting to decrease the speed.
17 of 9© Boardworks Ltd 2010 A crosswind acting on the car produces a sideways force. The crosswind causes the direction of the car to change – this happens because the sideways forces on the car are not balanced. The car will veer sideways. Balanced and unbalanced forces If the car turns right so that the wind is now behind the car, what will happen to the speed? 100 N cross wind 500 N
18 of 9© Boardworks Ltd 2010 The resultant force is calculated by finding the difference between opposing forces in each direction. What is the resultant force on this truck? The sum effect of more than one force is called the resultant force. A resultant force of 100 N is accelerating the truck. Resultant force 500 N 400 N
19 of 9© Boardworks Ltd 2010 Balanced and unbalanced forces – summary and the object is stationary, it will remain stationary and the object is moving, it will continue to move at the same speed and in a straight line. If the forces are unbalanced, four things can happen: If the forces on an object are balanced: In other words, the object will continue to do what it is already doing without any change. The speed can change. It can start moving. It can stop moving. It can change direction.
20 of 9© Boardworks Ltd 2010 20 N 1. What is the resultant force on the satellite? Resultant force= 20 N – 10 N = 10 N down The satellite will accelerate downwards. Resultant forces – question 1 5 N
21 of 9© Boardworks Ltd 2010 5 N5 N 2. What is the resultant force on the bird? 5 N5 N5 N5 N The forces acting in each direction horizontally are equal in size, so there is no resultant force in this direction. Resultant force = 5 N – 5 N = 0 N Resultant forces – question 2 The vertical forces are not balanced, the bird will accelerate in a downwards direction. Resultant force= 5 N – 0 N = 5 N down
22 of 9© Boardworks Ltd 2010 The vertical forces are equal in size and opposite in direction so there is no resultant force in the vertical direction. The horizontal forces are not balanced, so the yacht will accelerate to the right. 10 N 13 N 3. What is the resultant force on the yacht? 10 N Resultant force= (20 N +10 N) – 13 N = 17 N right Resultant forces – question 3 20 N
Forces. Objective: TSW – Identify and describe the changes in position, direction, and speed of an object when acted upon by unbalanced forces. 6.8A.
1 of 9© Boardworks Ltd of 9© Boardworks Ltd 2012 What are forces?
1 of 54© Boardworks Ltd of 54© Boardworks Ltd 2008.
FRICTION Learning Outcome: Explain how the type of surface affects friction Explain how forces affect the motion of an object Starter: Can you.
© Boardworks Ltd of 20 © Boardworks Ltd of 41 KS3 Physics 9K Speeding Up.
© Boardworks Ltd of 31 KS4 Physics Forces.
Forces and Newton’s Laws Video Warm Up. What is a force? A force is a push or pull that causes an object to move, stop, or change direction. In physics,
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© Boardworks Ltd of 31 Physics Forces. © Boardworks Ltd of 31 Forces Types of forces Mass and weight Friction Summary activities Contents.
© Boardworks Ltd A slide contains teacher’s notes wherever this icon is displayed - To access these notes go to ‘Notes Page View’ (PowerPoint 97)
PS-5 Test Review. Questions 1 & 2 Distance – 60m/ magnitude only Displacement 10 m east/ magnitude and direction.
Activating Strategy. Forces Essential Question: How do gravity, inertia, and friction affect the balance of forces? Standard: S8P3b. Demonstrate the.
Mrs. Cholak Defined as a push or pull Motion of object is in the same direction as the force To describe a force, you must know: 1. the strength of the.
Think, pair and share… 1.Draw the diagram below in your journal. 2.What would happen if both people pushed in the same direction? Why? 3.What happens when.
Activating Strategy A chair will be placed in the middle of the floor. Teacher question: Are there any forces acting on this chair? Invite a student to.
2 pt 3 pt 4 pt 5pt 1 pt 2 pt 3 pt 4 pt 5 pt 1 pt 2pt 3 pt 4pt 5 pt 1pt 2pt 3 pt 4 pt 5 pt 2 pt 4 pt 6 pt 8 pt 10 pt 1pt Vocabulary Words Describing Motion.
$200 $300 $400 $500 $100 $200 $300 $400 $500 $100 $200 $300 $400 $500 $100 $200 $ 300 $400 $500 $100 $200 $300 $400 $500 $100 What is a Force? Newton’s.
1 of 8© Boardworks Ltd of 8© Boardworks Ltd 2008 If the ending force acting on an object is not zero, all the forces are said to be unbalanced.
Forces. Log into my website, click the Introduction to Forces Notes On a note card, define the following terms: Force Newton Unbalanced force Contact.
Today’s Activities Warm-up – Complete worksheet you picked up on your way in Think, Pair, Share Notes Forces questions.
Forces Types of forces Contact and non-contact forces Friction Balanced and unbalanced Speed Air resistance Terminal speed.
Who Wants To Be A Millionaire? Forces Edition Question 1.
© Boardworks Ltd of 20 © Boardworks Ltd of 24 KS3 Physics 7K Forces and their Effects.
Forces & Newton’s Laws Ch. 4. Forces What is a force? –Push or pull one body exerts on another –Units = Newton (N) –Examples: List all of the forces that.
The Laws of Motion Chapter 2 Physical Science. Ch2 L.1 Gravity and Friction What are some contact forces and some noncontact forces? What is the law of.
Forces Vocab My Favorite Forces May the Force be with you Forces? No, motion! No… ??? Speed and Velocity
Balanced & Unbalanced Forces D. Crowley, Balanced & Unbalanced Forces To be able to represent forces using arrows, and to understand the affects.
Do Now: What are Newton’s 3 Laws of Motion?. Do Now: What are Newton’s 3 Laws of Motion?
Forces Standard: S8P3 b. Demonstrate the effect of balanced and unbalanced forces on an object in terms of gravity, inertia, and friction.
FORCE & MOTION REVIEW. Question 1 A large bus travels city streets. It takes the bus 10 seconds to cross each city block. If all the city blocks are the.
Balanced and Unbalanced Forces. What is a force? A force is an action exerted on an object to change its state of rest or motion A force is a push or.
Newton’s Laws of Motion Newton’s First Law If there is no unbalanced force an object will move at constant velocity or remain at rest. Newton’s Second.
© Boardworks Ltd of 20 © Boardworks Ltd of 27 KS3 Physics 7K Forces and their Effects.
Unit 4 FORCES AND THE LAWS OF MOTION. 4-1 Forces Force: A push or pull exerted on an object Forces cause a change in velocity (acceleration) *cause a.
Guided Discussion Student notes are shown in blue.
Newton’s Laws of Motion
Speed The distance traveled by an object divided by the time taken to travel that distance. Speed = distance/time Example: Speed = 360km/4h = 90 km/h.
Sep. 12, 2001 Dr. Larry Dennis, FSU Department of Physics1 Physics 2053C – Fall 2001 Chapter 4 Forces and Newton’s Laws of Motion.
Newton’s Laws of Motion NOTE TAKING WORKSHEET. Section 1: Motion A. Motion is a change in __________________. 1. ______________ - the entire path an object.
G RAVITATIONAL R EVIEW. 1. Gravity is continuously applied to an object, causing it to accelerate. After a period of time, however, the object stops accelerating.
MOTION & FORCES CH d. motion: an object’s change in position relative to a reference point What is motion? How do you know the balloon moved?
Chapter 6: Motion & Force. What you should know: Changes in motion and position can be measured. The types of forces that act upon an object can be predicted.
Free Body Diagrams. Review: Newton’s 1 st Law An object in motion stays in motion in a straight line, unless acted upon by unbalanced force. A push or.
Laws of Motion.
Force. Something that changes the state of rest or the state of motion of an object. Can be a push or a pull Unit of measure Newtons N.
Chapter 3 Forces. Forces, Mass, and Acceleration the greater the force applied on an object, the greater the acceleration the greater the mass of an object,
Forces & Motion Unit Vocabulary. Motion The state in which one object’s distance from another is changing Must determine motion based on a reference point.
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