PPT-7.3 Gravity — a non-contact force

On the Giant Drop on the Gold Coast passengers fall 120 metres 39 storeys in 5 seconds reaching speeds up to 135 kmh A magnetic braking system stops them just before they hit the ground . Gravity. Gravity is a force that for us is always directed downwards. But to say that gravity acts 
downwards is not correct. Gravity acts down, no matter where you stand on the Earth. It is 
better to say that on Earth gravity pulls objects towards the center of the Earth. So no matter 
where you are on Earth all objects fall to the ground. By Emily Weil. 9/10/09. Science Standard 3- The Physical Setting. Indicator 5.3.6- Demonstrate that things on or near Earth are pulled towards it by Earth’s gravity.. Taken from: . http://www.indianastandards.org/standardSummary.asp?Subject=sci&Grade=5. A Brief Timeline of the . Discovery of Gravity. Aristotle. There . is . no effect or motion without a cause. . . The element of earth was thought to be heavy by nature and therefore pulled towards the centre of the (geocentric) universe.. Objects have a property called . inertia . which causes them to resist . changes. in their motion (Newton’s1. st. Law or Galileo’s law of inertia). .  . if it is at rest, it stays at rest.  if it is moving, it keeps moving with constant velocity. ASTR 101. Prof. Dave Hanes. Orbiting Near, Around, . and Away from the Earth. Let’s consider:. Ballistic missiles on Earth. Artificial satellites. Geosynchronous satellites. Actually escaping the Earth. Bell work. 1. ..  Which is generated when a bar magnet is moved through a wire coil?. A. electric current. B. gravitational field. C. thermal energy. . D. solar energy. Bell work. 1. ..  Which is generated when a bar magnet is moved through a wire coil?. EQ: What changes an object’s motion?. Friction and Gravity. What happens when you jump on a sled on the side of a snow-covered hill?. What happens at the bottom of the hill?. Friction and Gravity. Why does the sled’s motion change on the side of the hill and then again at the bottom?. Write down all given information. Write the formula you need to solve the problem.. Substitute the numbers in the equation.. Show all operations and solve.. Answers should include both numbers and units.. Gravity. Gravity is a force that for us is always directed downwards. But to say that gravity acts 
downwards is not correct. Gravity acts down, no matter where you stand on the Earth. It is 
better to say that on Earth gravity pulls objects towards the center of the Earth. So no matter 
where you are on Earth all objects fall to the ground. Objects have a property called . inertia . which causes them to resist . changes. in their motion (Newton’s1. st. Law or Galileo’s law of inertia). .  . if it is at rest, it stays at rest.  if it is moving, it keeps moving with constant velocity. Forces. Distinguish between contact and noncontact forces.. Explore the Law of Gravity by recognizing that every object exerts a gravitational force.. Objectives. Essential Question. What forces may hinder the motion of a soccer ball rolling across a field?. A. nswer 9/7/16. A hiker’s velocity begins at 1.8 m/s uphill and changes to 1.5 m/s uphill. How do you know that the hiker has a negative acceleration?. 4 Types of Friction. The 4 types of friction are: . Convert the following to scientific notation. Distance from Sun. : 92,960,000 . miles ____. Estimated Age of universe – 14,000,000,000. Convert the following to standard form. Speed of light = 9.0 * 10. Forces & Gravity. Notes. Write down the words in yellow.. The words in white are discussion points, you may write these down, but are not required.. Gravity. Gravity is a . force. that pulls objects toward each other..