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Year 7 Physics Essentials

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Year 7 Physics Essentials

A rescue team is testing equipment for a community science day. Use your knowledge of forces, motion, energy and simple machines to solve their challenges. Show your reasoning where asked.

Challenge 1: Forces and motion

Forces can change an object's motion or shape. A force is measured in newtons (N).

1.The trolley rolls forwards at a steady speed in a straight line. What does this tell you about the total force on it?
  • The forwards forces are greater than the backwards forces.
  • The forces are balanced, so the total force is zero.
  • No forces are acting on the trolley.
  • Gravity has stopped acting.
2.The student stops pushing, and the trolley gradually slows down. Name the force that mainly causes this change and explain why the trolley does not stop instantly.
3.A magnet attracts a steel clip without touching it. Is the magnetic force a contact force or a non-contact force? Give one other example of a non-contact force.

Challenge 2: Energy in action

Energy can be stored and transferred. Use the situation in each question to identify the energy involved.

4.A rescue worker stretches a sturdy elastic cord before releasing a small training marker. What type of energy is stored in the stretched cord?
  • Kinetic energy
  • Elastic potential energy
  • Sound energy
  • Thermal energy
5.A 2 kg equipment bag is lifted onto a platform 3 m above the ground. Use gravitational field strength g = 10 N/kg. Calculate the bag's weight and its gravitational potential energy gained. Show your working.
6.When the training marker is released, it moves and makes a small sound. Name the main energy store it had just before release and two forms of energy transferred as it moves and stops.

Challenge 3: Simple machines

Simple machines can change the size or direction of an applied force. They do not create energy.

7.A crate is pushed up a ramp from the ground onto a raised platform. What type of simple machine is the ramp? Explain one way it makes loading the crate easier.
8.Complete the sentence using each word once: lever, fulcrum. A is a simple machine that pivots around a .
9.Complete the sentence using each word once: effort, load. The force applied is the , and the object being moved is the .
10.A rescue team uses a pulley to raise a flag. What useful change can a fixed pulley make to the force used?
11.True or false: If an object is moving, the forces on it must be unbalanced. Correct the statement if it is false.
TrueFalse

3 printable pages

  • Year 7 Physics Essentials, page 1 of 3: Challenge 1: Forces and motion

    Page 1

  • Year 7 Physics Essentials, page 2 of 3: Challenge 2: Energy in action, Challenge 3: Simple machines

    Page 2

  • Year 7 Physics Essentials, page 3 of 3: 9. Complete the sentence using each word once: effort, load. The force applied is the

    Page 3

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