6th Grade  Chapter 10- forces and motion
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6th Grade Chapter 10- forces and motion

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6th Grade  Chapter 10- forces and motion 6th Grade Chapter 10- forces and motion Presentation Transcript

  • Chapter 10 Forces and Motion
  • Gravity
    • Gravity is a force of attraction that acts between bodies that have a mass.
    • Gravity was discovered by Sir Isaac Newton.
    • Gravity acts on all objects the same. If you drop a bowling ball and a tennis ball at the same time, they will both hit the ground at the same time because gravity is a constant.
    • The more matter something has the more gravitational pull it has. Our moon is much smaller than Earth and only has about 1/6 the amount of gravity .
    • Jupiter’s gravity is about 2.5 times stronger than Earth’s because of its size. That is why people weigh different weights on different planets.
  • How to Measure Gravity
    • Weight is a measure of how much Earth’s gravity pulls down on an object.
    • Mass is the amount of matter in an object, and mass does not change from place to place.
    • While your weight would change on the moon, your mass would not change.
    • Mass is measured with a balance.
    • Weight is measured with a scale.
    • Mass and weight are two different things, so we have to use two different units for them.
    • Mass is measured in g or kg. Weight is measured in Newtons (N).
    • A 10g weighs 1N on Earth. So if a rock had a mass of 30g, it would weigh 3N.
    View slide
  • Speed
    • Speed is the measure of how far you move in a given time. To find speed you need to know time and distance.
    • If you rolled a ball down a hill that was 100 meters long and it took 20 seconds to reach the bottom, its speed is 5 m/s. So the equation for velocity equals, v=d/t or distance over time.
    • The speed of the ball throughout the trip changed. It started off slow and got faster as it rolled down.
    • So, this calculation gives you an average speed and describes the movement for the entire trip down the street.
    View slide
  • Stopping
    • Gravity speeds you up as you go down a hill, but what makes you stop. Friction.
    • Friction is the push or pull that opposes motion between two surfaces that are touching each other
    • If you are roller blading, you might use the rubber stopper to cause friction against the street to help you stop.
    • H.W. Pg. 274, ques. 1 & 2. Page 288, 1-10.
  • Newton’s Three Laws of Motion
    • Before we talk about the laws, we have to learn about force, which is a push or a pull. Gravity is a force, as well as friction. Everytime you turn a page or open a door, you are using force to do so.
    • Law #1: Inertia- An object at rest tends to stay at rest, and a moving object moves in a straight line until it is acted upon by an outside force.
    • In other words, things don’t stop or start by themselves. The reasons things stop is because of friction.
  • Newton’s Second Law
    • This law involves force, mass and acceleration.
    • Law #2: Acceleration depends on the mass of an object and the force pushing or pulling the object.
    • Force = mass x acceleration, F=mXa
    • Acceleration = force/mass, a=F/m
    • It takes less force to accelerate something with a small mass. This is why large trucks need more powerful motors to get them going from a complete stop. If you want to go faster, you have to use more force. Like having to pedal harder on a bike.
  • Newton’s Third Law
    • Law #3: For every action there is an equal and opposite reaction.
    • If you push on a wall, the wall is pushing back at you at the same rate.
  • Test In One Week!!!!!!!