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Ardrossan Academy Dead Earth

Ardrossan Academy Dead Earth. Subtopic – SPACE – Gravity, MASS & weight. Lesson Title: Gravity, Mass & Weight. MASS. All objects are made up from tiny particles called ATOMS – these give them MASS

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Ardrossan Academy Dead Earth

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  1. Ardrossan AcademyDead Earth Subtopic – SPACE – Gravity, MASS & weight

  2. Lesson Title: Gravity, Mass & Weight

  3. MASS • All objects are made up from tiny particles called ATOMS – these give them MASS • Mass is a measure of how much matter there is in an object - it is measured in kilograms (kg) • A set of scales will give you your mass in kilograms

  4. GRAVITY • Gravity produces a force which acts between all objects in the universe • Any two objects with mass will have a force that attracts them to each other • The strength of these gravitational forces depends on the size of the masses involved

  5. WEIGHT • Weight is the name of the FORCE caused by the pull of gravity acting on a mass • Like other forces, weight is measured in newtons (N) • On Earth, an apple with a mass of 0.1 kg, will have a weight of about 1 N. (lots of people mistake weight for mass – be careful!)

  6. GRAVITY, STARS & PLANETS • Stars and planets are very large objects, which have a huge amount of mass. • The Earth has a mass of 6 x 1024 kg (that’s a 6 followed by 24 zeroes) • The Sun’s mass is almost a million times greater (six more zeroes on the end!) • Because their masses are very large they have strong gravitational forces

  7. GRAVITY, STARS & PLANETS • The Sun’s gravity is so strong it keeps the other planets in orbit around it • Each planet’s gravity is different due to their different masses • The Earth’s gravity is stronger than Mars, but weaker than Jupiter

  8. GRAVITY, MASS AND WEIGHT • The gravitational force acting on objects on Earth makes them feel heavy. • This is what we call WEIGHT • The greater the mass of an object, the greater its weight will be

  9. GRAVITY, MASS AND WEIGHT • Weight is related to mass by the strength of gravity • This can be written as a formula – weight = mass x gravity • On Earth, the strength of gravity is 10 newtons for each kilogram (10 N/kg)

  10. ACTIVITY 1 – GRAVITY ON PLANETS • Copy the table into your jotter, leaving room for another column • Using any relevant source (website, textbook etc) find the strength of gravity on each planet (on some web sites it might be given in other units – m/s2)

  11. ACTIVITY 2 – BUZZ’S WEIGHT ON PLANETS • Add another column to your table headed ‘Buzz’s Weight (N)’ • Use the formula – weight = mass x gravity to calculate the weight of a 0.5 kg Buzz Lightyear on each planet • Use your values to draw a bar graph showing Buzz’s weight on different planets

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