Let's See What we can Remember?

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2 Let's See What we can Remember? * What is Acceleration? A change in velocity * How do you determine an objects velocity? Speed & Direction * What is speed? How fast an objects position is changing *What is force and what are the 2 types? Gravity & Friction

3 What affects Acceleration and Motion? Two things that can affects and objects acceleration and motion. The first is Force. Remember force is a push or a pull that acts on an object. The second is mass. If you multiply the double force applied to object it's acceleration will also double. If you double the mass of an object the acceleration will be cut in half. If you increase force acceleration increases if you increase mass acceleration decreases. Acceleration is calculated by dividing force by mass. NOTES: *Force and mass can affect an objects motion *Increase force acceleration increases *Increase mass acceleration decreases *Acceleration = force mass

4 What balanced and unbalanced forces

5 What balanced and unbalanced forces? When all of the forces on an object cancel one another out it is known as balanced forces. In cases where a certain force is either partially canceled or not canceled at all by other forces are known as unbalanced forces. In order for an object to accelerate there must be unbalanced forces. NOTES: *2 Types of Forces: Balanced and Unbalanced *Balanced force are forces that cancel each other out *Unbalanced forces are forces that do not cancel or partially cancel each other out. *In order for an object to accelerate there must be unbalanced forces. KEY WORDS: BALANCED FORCES = NO MOVEMENT UNBALANCED FORCES = MOVEMENT

6 So What Does All This Mean? When an unbalanced force acts on an object, the object's acceleration equals the force divided by the object's mass which is also known as Newton's Second Law of Motion. Newton's 2nd Law of Motion states acceleration equals force divided by an object's mass. So in order for all objects to move a unbalanced force must act on it. NOTES: *Newton's 2nd Law of Motion: Acceleration equals force divided by object's mass. Click Here to Learn More

7 Experiment Time! Racing Balloon Rockets Experiment Directions: *Pass out Racing Balloon Rockets Worksheet Directions When Finished: Complete "Where Does the Force Come From?" Worksheet

8 Let's See What we can Remember? * What are the two things that affect and objects acceleration and motion? Mass and Force *What are the key words with unbalanced and balanced forces? Balanced = No Movement Unbalanced = Movement

9 Force isn't a One Way Street When one object applies a force to a second, this is called the action. The force the second object returns to the first is called the reaction. The action is when one object applies force to another. The reaction is the force that a second object returns to the first object. These two concepts make up Newton's 3rd Law of Motion. Newton's 3rd Law of Motion states for every action, there is an equal but opposite reaction. Remember force and mass can also effect the reaction. Even though the reaction and action go in opposite directions the speed is equal. NOTES: Click Here to Learn More *Newton's 3rd Law of Motion: for every action there is an equal but opposite reaction. *Action: one object applies for to another *Reaction: the force the 2nd object returns *Force and Mass can effect the reaction *Speed is EQUAL

10 Newton's Laws Cut Fold Fold Cut

11 How can Forces Affect Us? Everywhere around us, forces act. Newton's laws of motion give us a useful picture of the ways forces work. They also tell us how to predict what will happen when forces are applied to objects. So let's check these out: So Let's Review What we've Learned:

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