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Newton's Laws
Newton's Laws
Newton's Laws
Newton's Laws
Newton's Laws
Newton's Laws
Newton's Laws
Newton's Laws
Newton's Laws
Newton's Laws
Newton's Laws
Newton's Laws
Newton's Laws
Newton's Laws
Newton's Laws
Newton's Laws
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Newton's Laws

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A summary of Newton's 1st, and 2nd laws.

A summary of Newton's 1st, and 2nd laws.

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  • 1. Chapter 4 section 1 The first law of motion <ul><li>If the net force acting on an object is zero, the object remains at rest </li></ul><ul><li>Or, if the object is moving, it continues in a straight line with constant speed </li></ul><ul><li>What’s another way to say “net force equals zero”? </li></ul>
  • 2. Unbalanced Forces Change Velocity <ul><li>Skateboard at rest stays at rest until you push it. </li></ul><ul><li>The velocity increases while you are pushing it-unbalanced forces </li></ul><ul><li>Why does it slow down and stop? </li></ul><ul><li>The unbalanced frictional force acts to slow it down- change the velocity </li></ul>
  • 3. Inertia and Mass <ul><li>All objects have a property called inertia </li></ul><ul><li>It is the tendency of an object to resist an change in its motion </li></ul><ul><li>A dirt bike rider trying to take a corner as fast as he can </li></ul><ul><li>The inertia of an object depends on the mass </li></ul><ul><li>The greater the mass the greater the inertia </li></ul>
  • 4. Inertia and the First Law of Motion <ul><li>The first law of motion is sometimes called the law of inertia </li></ul><ul><li>What happens in a head on car crash? </li></ul><ul><li>The car stops, but the passenger not wearing a seat belt continues to move forward at the same speed the car was going. In about 0.02 s the person hits the dashboard </li></ul>
  • 5. <ul><li>Force and acceleration are related </li></ul><ul><li>Throwing a ball with greater force has greater acceleration than a gently thrown ball </li></ul><ul><li>And </li></ul><ul><li>Mass and acceleration are related </li></ul><ul><ul><li>The greater the mass the smaller the acceleration </li></ul></ul><ul><ul><li>Softball vs baseball </li></ul></ul><ul><ul><ul><li>Assume you throw with same force, the softball has less velocity and acceleration </li></ul></ul></ul><ul><ul><li>Acceleration depends on mass as well as net force </li></ul></ul>
  • 6. The Second Law Motion <ul><li>States that acceleration of an object is in the same direction as the net force on the object </li></ul><ul><li>Calculated a = f /m </li></ul><ul><li>Change this equation to calculate force: </li></ul><ul><li>f= m/a </li></ul>
  • 7. Quiz <ul><li>Gravity depends on the ___________ of the objects and the _____________ between them. </li></ul><ul><li>Newton’s first law states that in order for an object’s velocity to change, forces must be _____________. </li></ul><ul><li>What is inertia? </li></ul><ul><li>What is inertia directly related to? </li></ul><ul><li>2 nd law: Acceleration depends on _________ and _____________. </li></ul><ul><li>Acceleration is in the same____________ of the net force. </li></ul><ul><li>What is centripetal force? </li></ul>
  • 8. Projectile Motion <ul><li>Projectile is something that is shot through the air, ie a softball </li></ul><ul><li>Forward force gives it horizontal movement </li></ul><ul><ul><li>After you let go, the velocity is constant </li></ul></ul><ul><ul><li>But there is also vertical motion caused by gravity </li></ul></ul><ul><li>Important point: horizontal and vertical motion are independent, but together make the movement look curved </li></ul>
  • 9. What if you… <ul><li>Pitched a baseball forward and at shoulder height and dropped one straight to the ground from the same height? Which one would get to the ground first? </li></ul><ul><li>They would get there at the same time- horizontal and vertical motion are independent of each other </li></ul>
  • 10. Centripetal Force <ul><li>The net force toward the center of a curved path </li></ul><ul><li>Any force which keeps an object moving in the curved path instead of shooting off straight. </li></ul><ul><li>Examples? </li></ul><ul><li>The force of gravity </li></ul><ul><li>Friction </li></ul>
  • 11. This week <ul><li>Thursday: review for test </li></ul><ul><li>Friday: test </li></ul><ul><li>If you miss the test, the make-up will most definitely be more DIFFICULT </li></ul><ul><li>If you plan on being gone tomorrow, get the review from me today b/c you will still have to take the test </li></ul>
  • 12. Review <ul><li>A projectile is what? </li></ul><ul><li>Vertical motion and horizontal motion of a projectile are ____________ of each other </li></ul><ul><li>What is the net force toward the center of a curved path? </li></ul><ul><li>What is another way to say that? </li></ul><ul><li>Example? </li></ul>
  • 13. 4.3 Newton’s 3 rd Law <ul><li>When one object asserts a force on another, the second object exerts a force that is equal in strength and opposite in direction </li></ul><ul><li>What is another way to say that? </li></ul><ul><li>For every action there is an equal and opposite reaction </li></ul>
  • 14. Action and Reaction Forces do not cancel <ul><li>Just b/c an action produces an equal and opposite reaction, that doesn’t mean the forces balance </li></ul><ul><li>The forces are acting on different objects </li></ul>
  • 15. Momentum <ul><li>Momentum is related to how much force is needed to change an objects motion </li></ul><ul><li>Momentum= mass multiplied by velocity </li></ul><ul><li>M = mv </li></ul><ul><li>Another way to say this would be? </li></ul><ul><li>The greater the mass and/or velocity, the greater the momentum </li></ul>
  • 16. Law of Conservation of Momentum <ul><li>The momentum of an object doesn’t change unless its mass and/or velocity change </li></ul><ul><li>Momentum can be transferred from one object to another </li></ul><ul><li>Pool ball example </li></ul>

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