Week 2 Quarter 3 science

• Gravity


  A force that pulls objects toward each other
• Gravity


  • It is the force that makes an apple fall to the ground
  • It is the force that keeps the moon orbiting around Earth
  • It is the force that keeps all the planets in our solar system orbiting around the sun
• Law of universal gravitation


  The force of gravity acts between all objects in the universe
• Mass of an object


  The greater the mass, the greater the gravitational force
• Distance between objects


  The farther apart two objects are, the lesser the gravitational force between them
• Free fall


  When the only force acting on an object is gravity
• Every object that has mass has gravitational pull
• Gravity pulls over infinite distances
• The pull of the earth on an object is stronger than the pull between two objects
• Gravity is a force that tries to pull two objects toward each other
• The gravitational force is a force that attracts any objects with mass
• The more mass an object has, the bigger the force of attraction
• The closer the object is, the bigger the force of attraction
• The earth always produces the same acceleration on every object
• Gravity


  • Causes an apple to fall to the ground
  • Keeps the moon orbiting around Earth
  • Keeps planets orbiting around the sun
• Throwing a ball upward


  Gravity pulls the ball back down
• Gravity on an object on an inclined surface


  Directed downward along the inclined surface
• If the Earth did not have gravity, life would cease to exist and all objects not anchored down would float
• Gravity


  The mysterious force that makes everything fall down towards the Earth
• Gravity


  • All objects have gravity, but some objects like the Earth and the Sun have a lot more gravity than others
  • The amount of gravity an object has depends on how big it is (how much mass it has)
  • The amount of gravity also depends on how close you are to the object - the closer you are, the stronger the gravity
• Without Earth's gravity, we would fly right off it and everything would have to be strapped down
• Matter


  Things you can physically touch
• Gravitational force


  The attraction of objects towards the Earth
• Practical benefits and applications of gravity


  • Gravity brings us back down to the ground even when we jump
  • Gravity prohibits us from floating into space
  • Gravity keeps the water on the Earth
  • Gravity makes rain fall to the ground
  • Gravity lets everyone move easily on Earth
  • Gravity allows Earth to retain its atmosphere
  • Gravity is a "constant force" which keeps things in place
  • Gravity being able to store its energy as "potential energy", allows us to harness it
  • Gravity causes the moon to revolve around the sun
  • Gravity keeps our muscles and bones, up and working
• Watermelon and apple dropped from the same height


  The watermelon will hit the ground first
• Gravity is what causes things to orbit
• What causes things to orbit?
• But how about if there is no gravity on Earth. What will happen? Would life be possible on Earth?
• Let us watch a video and find out what will happen if there was no gravity on Earth


  Write your answers on the space provided
• Gravity keeps everything down; here are some of the practical benefits and applications of gravity
• Practical benefits and applications of gravity


  • Gravity brings us back down to the ground even when we jump
  • Gravity prohibits us from floating into space
  • Gravity keeps the water on the Earth
  • Gravity makes rain fall to the ground
  • Gravity let's everyone to move easily on Earth
  • Gravity allows Earth to retain its atmosphere
  • Gravity is a "constant force" which keeps things in place
  • Gravity being able to store its energy as "potential energy", allows us to harness it
  • Gravity causes the moon to revolve around the sun
  • Gravity keeps our muscles and bones, up and working
• Gravity causes a rock to roll downhill
• Gravity from the moon causes the tides of the ocean
• Gravity causes a jump rope to come back to the ground after you swing it over your head
• Friction and gravity play an important role on road safety
• The opposing motion of the friction helps object to move, slow down and stop
• Gravity, the downward pull of the Earth keeps objects on the ground
• Maintenance checkup of any vehicle is important in ensuring the safety of both drivers and their passengers
• A responsible driver always follows traffic regulations and road signs
• A car will skid more on a wet road than a dry road


  There is less friction between the tires and the road on a wet road