The First Law of Motion-Law of Inertia.pptx

What is it?

1) The sum of all the forces acting on an object is called _______________. net force 2) Net force will be equal to zero if the magnitude of the forces are ________________ and ________________ in direction. equal opposite 3) When the net force is equal to zero the forces acting on an object are _________________. balanced

4) Net force acting on an object is equal to the sum of the individual forces when the forces are in the _________________ direction. same 5) Net force is equal to the ______ of all the forces. sum

Solve this! To move an object, one force is directed to the right with 25 Newtons and two forces are directed to the left with 5 Newtons each, what is the net force? In what direction did the object move? (Show your solution)

Lesson Objectives A. Define inertia. B. Understand the historical development of the Three Laws of Motion. C. Relate the concept of inertia to the experience when riding a vehicle.

Coin, coin how to make you fall?

Why do you think the coin dropped inside the drinking glass and did not move forward with the cardboard?

Inertia The tendency of an object to resist changes in their state of motion or keep doing what they are doing.

Inertia Changing a body’s state of motion depends on its inertia. A more massive object which has more inertia is more difficult to move from rest, slow down, speed up, or change its direction.

Law of Inertia The object will remain at rest or in constant velocity unless acted upon by an external force. How is inertia related to balanced and unbalanced forces?

History of the Three Laws of Motion

Guide questions: Who is the philosopher who started the study of motion? In the old times, what factor caused objects to move? Who formulated the Three Laws of Motion?

Guide questions: What is inertia? How does inertia affect the motion of the object/body? What are the three types of inertia? Describe each.

Guide questions: What is stated in the Law of Inertia? How does inertia affect the motion of the object/body? What are the three types of inertia? Describe each.

Safety first! Why do we need to fasten our seatbelts when riding a vehicle?

Fill in the blank. The tendency of an object to resist changes in their state of motion or keep doing what they are doing is called ______________________. inertia

Fill in the blank. An object with great mass has a ____________________ inertia. Therefore a _____________ amount of force is needed to make a change in its position or motion. greater great

Fill in the blank. The Law of Inertia states that the object will remain at ___________ or in ____________________ velocity unless acted upon by an _____________________ force. rest constant external

Let’s test your understanding!

Multiple choice 1 Which of the following best describes inertia? A) The tendency of an object to remain at rest or in motion unless acted upon by an external force. B) The force that pulls objects toward the center of the Earth. C) The rate at which an object changes its velocity. D) The resistance of an object to being compressed.

Multiple choice 2. Which of the following objects has the least inertia? A) A bowling ball B) A feather C) A bicycle D) A truck

Multiple choice 3. Which scenario best illustrates the concept of inertia? A) A car suddenly stops and the passengers are moving forward. B) A ball accelerates as it rolls downhill. C) A parachute slows down a skydiver. D) A magnet attracts a metal object.

Multiple choice 4. Which of the following statements is true regarding inertia? A) All objects, regardless of mass, have the same amount of inertia. B) Objects with more mass have more inertia. C) Objects with less mass have more inertia. D) Inertia is unrelated to mass.

Multiple choice 5. In which scenario is inertia not playing a significant role? A) A car coming to a sudden stop. B) A ball was thrown into the air falling back down. C) A person pushing a heavy box that resists moving. D) A skateboard continues to roll after being pushed.

Multiple choice 6. Inertia is most directly related to which of the following physical properties of an object? A) Volume B) Speed C) Mass D) Shape

Multiple choice 7. Which of the following best describes how inertia affects an object’s motion? A) It causes objects to change direction. B) It resists changes to an object’s state of motion. C) It increases the speed of moving objects. D) It reduces the friction acting on objects.

Multiple choice 8. Why do passengers tend to move forward in their seats when a car suddenly stops? A) Because of gravity B) Because of inertia C) Because of friction D) Because of acceleration

Multiple choice 9. If two objects are moving at the same speed, which one has more inertia? A) The object with more mass B) The object with less mass C) They have the same inertia D) Inertia does not depend on mass in this situation

Multiple choice 10. Which of the following would have the greatest inertia? A) A baseball B) A car C) A bicycle D) A basketball