acceleration and force
Download as PPTX, PDF
2 likes1,462 views
This document discusses acceleration, force, and motion. It defines acceleration as the rate of change of velocity and describes how acceleration can be calculated using change in velocity, time, and the acceleration equation. Two types of forces are explained: balanced forces which cause no movement and unbalanced forces which cause movement in the direction of the larger force. Inertia is defined as an object's resistance to changes in motion. Newton's First Law of Motion, also known as the Law of Inertia, states that an object at rest stays at rest and an object in motion stays in motion unless an unbalanced force acts upon it. Examples of inertia and Newton's First Law include car crashes and the use of seat belts. Homework assignments
acceleration and force
- 1. Acceleration and Force Sec 2 and 3 Thursday 10/3/13
- 2. Acceleration The rate of change of velocity Speeding up Increasing speed/velocity = positive acceleration Slowing down Decreasing speed/velocity = negative acceleration
- 3. 2 ways to Change Velocity 1. moving by going faster 2. Moving by changing direction Change in velocity = Final velocity initial velocity
- 4. Calculating Acceleration Acceleration = a Velocity final = VF Velocity initial = Vi Time = t units = meter per second squared (m/s2) Change in Velocity (Vf Vi) Acceleration Time Acceleration of gravity = 9.8 m/s2
- 5. Roller Coasters and acceleration
- 6. Practice Problems A ball is dropped from a cliff and has an acceleration of 9.8 m/s2 . How long will it take for the ball to reach a speed of 24.5 m/s? A sprinter leaves the starting blocks with an acceleration of 4.5 m/s2. What is the sprinters speed 2 seconds later?
- 7. Homework 10.3 Ch 2 Reinforcement section 2
- 8. Friday 10.4.13 Drop box Reinforcement sec 2 Pick up 10.4 Reinforcement sec 3 Force Notes
- 9. Goals Explain how force and motion are related Describe Inertia Explain what forces are present in a car crash
- 10. Tug-of-War The photo shows one team pulling but not very much moving. In which direction must the other team be pulling? Why? If one team tugs the other over the line, what can you assume about the pulls exerted by the two teams?
- 11. Force Is a push or a pull What happens to an object when you push or pull it? Transfer of energy from one object to another object
- 12. 2 types of forces Balanced forces two or more forces acting on an object in opposite directions causes a net force of zero (no movement) Unbalanced forces two forces acting on an object in the same direction (movement in the direction of the bigger force)
- 13. Inertia The tendency of an object to resist any change in motion An object in motion will stay in motion until something stops it An object at rest will stay at rest until acted on The more mass an object has the more inertia or the harder it is to stop once in motion Think of stopping a toy car with your hand and a real car with your hand. Which one is possible?
- 14. Newtons First Law of Motion An object in motion stays in motion and an object at rest stays at rest until an unbalanced force acts on it. Also known as the Law of Inertia Ex: car crashes and seat belts
- 15. Homework 10.4 Reinforcement section 3