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Drag and Upthrust Forces

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Drag and Upthrust Forces

A research team is testing how drag and upthrust affect boats, swimmers and parachutes. Read each situation carefully and use evidence to explain your ideas.

Forces in action

Use the scenarios to identify what each force does.

1.A kayak moves through water. The water pushes against it and makes it harder to move. What is this force called?
  • Upthrust
  • Drag
  • Gravity
  • Magnetism
2.A floating toy boat is pushed upwards by the water. Name the force that pushes it up.
3.Select every situation where drag acts on a moving object.
  • A cyclist riding through air
  • A swimmer moving through water
  • A book resting on a table
  • A parachute falling through air
4.Two paper parachutes have the same load. One has a much wider canopy. Which is likely to fall more slowly, and why?

The floating-boat investigation

A team tests three objects in a tub. Their observations are shown below.

Object

Observation after release

Cork

Floats at the surface

Metal key

Sinks to the bottom

Sealed plastic bottle

Floats partly above the surface

5.Which two objects float in the team's test?
6.The metal key sinks. What does this tell you about the upward force of upthrust compared with the key's weight while it is sinking?
7.A boat can carry a heavy load and still float. Explain how the boat's shape helps it stay afloat.

Solve the harbour challenges

Apply what you know about drag and upthrust to make predictions.

8.A cyclist crouches low and makes their body shape smaller at the front. Fill the gap: This reduces , so the cyclist can move through the air with less resistance.
9.A feather and a stone are dropped together from the same height in still air. Which is likely to reach the ground first? Explain using drag.
10.Plan a fair test to compare the air drag on a flat sheet of paper and the same sheet scrunched into a ball. State what you would keep the same and what you would measure.
11.A small boat is floating steadily. Draw and label two arrows to show the main vertical forces on it. Make the arrows show which way each force acts.

3 printable pages

  • Drag and Upthrust Forces, page 1 of 3: Forces in action, The floating-boat investigation

    Page 1

  • Drag and Upthrust Forces, page 2 of 3: Solve the harbour challenges

    Page 2

  • Drag and Upthrust Forces, page 3 of 3: 11. A small boat is floating steadily. Draw and label two arrows to show the main…

    Page 3

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