Second Law of Motion_Law of Acceleration.pptx

Presentation on the Second Law of Motion

1. What is it?

2. 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

3. 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

4. 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

5. Lesson Objectives A. Define acceleration . B. Describe Law of Acceleration. C. Solve various problems about Law of Acceleration.

6. Review

7. What is force? -The push or pull applied on an object. What is acceleration? -The rate of change of velocity with respect to time. What is mass? -A quantity or aggregate of matter usually of considerable size.

8. Law of Acceleration Which of these two will move faster? Force applied=3N Force applied=5N Mass=6kg Mass=6kg

9. Law of Acceleration Newton’s Second Law states that the acceleration of an object depends on two things: 1. The force applied to the object. 2. The mass of the object.

10. F net a= m a (acceleration) Fnet (net force) m (mass) What is the relationship between acceleration and net force if the mass of object is constant? Answer: Directly proportional What is the relationship between acceleration and mass of the object if the net force is constant? Answer: Inversely proportional

11. Law of Acceleration The acceleration of an object is directly proportional to the magnitude of the net force and inversely proportional to the mass of the object.

12. What are the examples where the second law of motion is present? Cite activities where the relationship between acceleration, net force and mass are present.

13. Why is the Law of Acceleration Important? The Law of Acceleration helps us predict how objects will move when forces are applied. Engineers use this law to design everything from cars to airplanes, making sure they move efficiently and safely. Athletes also rely on this principle to improve their performance, like sprinters pushing off the starting blocks with maximum force to accelerate quickly.

14. Conclusion Newton’s Second Law of Motion, or the Law of Acceleration, is a fundamental concept that explains how the force applied to an object affects its motion. Remember, the greater the force applied, the faster an object will accelerate, and the heavier the object, the harder it is to accelerate. This law is all around us and helps us understand the movement of objects in our everyday lives.

15. Newton's Second Law of Motion states that the acceleration of an object depends on the: a) Mass of the object and the force applied b) Speed and direction of the object c) Shape and size of the object d) Color and temperature of the object

16. 2. If the same force is applied to two objects of different masses, which object will have a greater acceleration? a) The object with more mass b) The object with less mass c) Both will have the same acceleration d) Acceleration does not depend on mass

17. 3. What is the unit of force in the International System of Units (SI)? a) Kilogram (kg) b) Meter (m) c) Newton (N) d) Joule (J)

18. 4. If a force of 10 N is applied to an object with a mass of 2 kg, what is the acceleration of the object? (Use the formula: F = ma) a) 5 m/s² b) 10 m/s² c) 20 m/s² d) 2 m/s²

19. 5. Which of the following equations represents Newton's Second Law of Motion? a) F = ma b) E = mc² c) a = v/t d) p = mv

20. 6. An object has a mass of 3 kg and an acceleration of 4 m/s². What is the force acting on the object? a) 7 N b) 12 N c) 1.5 N d) 9 N

21. 7. If the force on an object is doubled while its mass remains constant, what happens to the object's acceleration? a) It doubles b) It halves c) It remains the same d) It becomes zero

22. 8. Which of the following scenarios best illustrates Newton's Second Law? a) A ball sitting on the ground b) A car speeding up as the driver presses the gas pedal c) A bird flying at a constant speed d) A book resting on a table

23. 9. If an object’s mass increases but the applied force remains constant, what happens to the acceleration of the object? a) It increases b) It decreases c) It remains the same d) It becomes zero

24. 10. A 5 kg object is accelerated at 3 m/s². What is the force applied to the object? a) 8 N b) 15 N c) 20 N d) 5 N

25. Law of Acceleration The acceleration of an object is directly proportional to the magnitude of the net force and inversely proportional to the mass of the object.

26. Problem Solving

27. F net a= m Derivation of Formula

28. SYSTEM MASS UNIT OF ACCELERATION UNIT OF FORCE Meter-Kilogram-Second kg m/s2 N= kg. m/s2 Centimeter-Gram-second g cm/s2 dyn =g. cm/s2 Foot-Pound-second slug ft/s2 lbs =slug. ft/s2 Units and System

29. 1. An object with a mass of 2.0 kg accelerates 2.0 m/s2 when an unknown force is applied to it. What is the amount of the force? ______________________ 2. An object with a mass of 5.0 kg accelerates 8.0 m/s2 when an unknown force is applied to it. What is the amount of the force? ______________________ 3. An object with a mass of 1500 g (grams) accelerates 10.0 m/s2 when an unknown force is applied to it. What is the amount of the force?

30. 4. An object with a mass of 6.0 kg accelerates 4.0 m/s2 when an unknown force is applied to it. What is the amount of the force? ______________________ 5. An object with a mass of 7.5 kg accelerates 8.3 m/s2 when an unknown force is applied to it. What is the amount of the force? ______________________

31. 7. An object accelerates 3.0 m/s2 when a force of 6.0 newtons is applied to it. What is the mass of the object? ___________________________ 8. An object accelerates 12.0 m/s2 when a force of 6.0 newtons is applied to it. What is the mass of the object? ___________________________ 9. An object accelerates 5.0 m/s2 when a force of 20.0 newtons is applied to it. What is the mass of the object? ___________________________

32. 10. An object accelerates 2.0 m/s2 when a force of 12.0 newtons is applied to it. What is the mass of the object? ___________________________ 11. An object accelerates 7.2 m/s2 when a force of 4.0 newtons is applied to it. What is the mass of the object? ___________________________ 12. An object accelerates 16.3 m/s2 when a force of 4.6 newtons is applied to it. What is the mass of the object? ___________________________

33. 13. An object with a mass of 2.0 kg has a force of 4.0 newtons applied to it. What is the resulting acceleration of the object? ________________________ 14. An object with a mass of 5.0 kg has a force of 20.0 newtons applied to it. What is the resulting acceleration of the object? ________________________ 15. An object with a mass of 20.0 kg has a force of 5.0 newtons applied to it. What is the resulting acceleration of the object? ________________________

34. 16. An object with a mass of 3.0 kg has a force of 9.0 newtons applied to it. What is the resulting acceleration of the object? ________________________ 17. An object with a mass of 2300 g has a force of 6.2 newtons applied to it. What is the resulting acceleration of the object? ________________________

35. 19. An object accelerates 8.2 m/s2 when a force of 20.1 newtons is applied to it. What is the mass of the object? ___________________________ 20. An object with a mass of 6.3 kg has a force of 7.1 newtons applied to it. What is the resulting acceleration of the object? ________________________ 21. An object with a mass of 6.5 kg accelerates 12.3 m/s2 when an unknown force is applied to it. What is the amount of the force? ______________________

36. 1) A 1000kg truck is traveling at an acceleration of 4.5 m/s2, East. What is the net force needed to accelerate the truck? 2. A boy rolls a 200g baseball horizontally on the floor with a net force of 2N to the right. What is the acceleration of baseball? 3. A box is pushed with an applied force of 20N parallel to the floor. It accelerated at 1.50m/s2 to the right. A parallel applied force of 10N on the opposite side slowed down the motion of the box. Neglecting friction, what is the mass of the box?

37. 4. A car with a mass of 700kg suddenly stopped on the road. The driver asked the bystanders to help him push the car to the nearest auto shop which is located a few meters East of their current location. The people pushed it with 3000N of force. What is the acceleration of the car? 5. A bowling ball with a mass of 7.3kg was rolled by a boy with an acceleration of 1.50m/s2 to the right. Find the net force needed to accelerate the bowling ball.

38. Acceleration due to gravity If a man has a mass of 40 kg, what is his weight on Earth?