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Gravity Drop Test Experiments

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Gravity Drop Test Experiments

Hugo, Ngaio and Tane are testing how objects fall during a mountain hike. Read the results, think like a scientist and use evidence to explain what gravity does. Never drop objects from a height where they could hit someone or break.

What makes things fall?

Use what you know about forces to answer these questions.

1.Which statement best describes gravity on Earth?
  • A force that pulls objects towards Earth
  • A force that makes objects float upwards
  • A force that only works on heavy objects
2.Hugo lets go of a small pebble while standing still. Which way will it start moving?
3.Ngaio says, “Gravity pulls only on objects that are moving.” Is she right? Explain your answer.

Compare the drop tests

The hikers dropped each object from the same height, one at a time, in calm air. They repeated each test three times and recorded the average time. The tests were done safely close to the ground.

Object

Average time to reach the ground

Flat paper sheet

1.8 seconds

Crumpled paper ball

0.9 seconds

Small pebble

0.9 seconds

4.Which object took the longest time to reach the ground?
5.The crumpled paper ball and the pebble had the same average time. What does this suggest about how an object's mass affects falling in this test?
6.Why might the flat paper sheet fall more slowly than the crumpled paper ball?
  • The flat sheet has more air pushing against it as it falls
  • Gravity does not pull on flat paper
  • The flat sheet is moving towards the sky
7.Tane wants to make the test fair. Name one thing the hikers should keep the same for every drop.
8.Complete the explanation: Gravity pulls the objects Earth. Air resistance can the fall of a flat sheet.

Gravity beyond Earth

Gravity acts on objects on the Moon too, but it is weaker there than on Earth.

9.If Hugo dropped the same object from the same height on the Moon, would gravity pull it down more strongly or less strongly than on Earth?
  • More strongly
  • Less strongly
  • Gravity would not act at all
10.Explain why an astronaut can jump higher on the Moon than on Earth. Include the word “gravity” in your answer.
Draw a small object above the ground. Add an arrow to show the direction gravity pulls it. Label the arrow “gravity”.

4 printable pages

  • Gravity Drop Test Experiments, page 1 of 4: What makes things fall?

    Page 1

  • Gravity Drop Test Experiments, page 2 of 4: Compare the drop tests

    Page 2

  • Gravity Drop Test Experiments, page 3 of 4: Gravity beyond Earth

    Page 3

  • Gravity Drop Test Experiments, page 4 of 4: Draw a small object above the ground. Add an arrow to show the direction gravity

    Page 4

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