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Question

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Explanation:

Analyze Activity 1: Choose the Best Answer

We evaluate each multiple-choice question based on basic physics principles:

  1. Non-contact forces act at a distance. Gravity is non-contact, while pushing and friction require physical contact.
  2. A moving car possesses kinetic energy due to its motion.
  3. Opposite electric charges attract each other, whereas like charges repel.
  4. Gravity is the force that keeps the Moon orbiting the Earth.
  5. An electromagnet requires electricity (batteries and wire) and a magnetic core (iron nail) to function.

Analyze Activity 2: Match It Up

We match each term on the left with its correct description on the right:

  1. Balanced forces: When forces are equal and acting in opposite directions (no change in motion).
  2. Static electricity: A buildup of electric charges on a surface.
  3. Weight: The force of gravity acting on an object.
  4. Orbit: The path an object takes around another object.
  5. Magnetic field: An area around a magnet where it can attract or repel.
  6. Electromagnet: A magnet made using electricity.

Analyze Activity 3: Look and Answer

We observe the pictures to answer the questions:

  1. The boy is pushing the box, so the force is a push (or contact force).
  2. The balloon sticks to the wall due to static electricity (electrostatic force).
  3. Gravity is pulling the apple down to the ground.
  4. As the roller coaster cars go down the slope, potential energy is converted into kinetic energy.

Analyze Activity 4: Fill in the Blanks

We select the correct words from the provided box (gravity, attract, kinetic, mass, friction, repel) to complete the sentences:

  1. The force that pulls things toward Earth is gravity.
  2. Moving objects have kinetic energy.
  3. Mass means more matter in an object.
  4. Opposite charges attract each other.
  5. Friction is a force that acts between two surfaces and opposes motion.
  6. Like poles of magnets repel each other.

Analyze Activity 5: True or False

We evaluate each statement:

  1. Energy cannot be created from nothing (Law of Conservation of Energy) -> FALSE.
  2. The Earth is held in orbit around the Sun by gravity -> TRUE.
  3. Weight depends on gravity; since gravity is weaker on the Moon, weight will be less -> TRUE.
  4. Not all metals are magnetic (e.g., copper, aluminum are not) -> TRUE.
  5. Electrostatic charges can make your hair stand up -> TRUE.
  6. An electromagnet can be turned off by cutting the electric current -> TRUE.

Analyze Activity 6: Label the Diagram

We label the components of the electromagnet using the words in the box (battery, iron nail, wire, switch):

  • The power source is the battery.
  • The metal core is the iron nail.
  • The coiled conductor is the wire.
  • The mechanism to open/close the circuit is the switch.

Analyze Activity 7: Short Answer

We answer the conceptual questions:

  1. Two examples of contact forces are friction and applied force (pushing/pulling).
  2. Roller coaster cars have potential energy at the top of a hill.
  3. Without gravity, objects would flo…

Answer:

Activity 1: Choose the Best Answer

  1. b) Gravity
  2. a) Kinetic
  3. a) Attract
  4. b) Gravity
  5. a) Batteries and wire

Activity 2: Match It Up

  1. Balanced forces — When forces are equal and acting in opposite directions
  2. Static electricity — Buildup of electric charges on a surface
  3. Weight — The force of gravity acting on an object
  4. Orbit — The path an object takes around another object
  5. Magnetic field — An area around a magnet where it can attract or repel
  6. Electromagnet — A magnet made using electricity

Activity 3: Look and Answer

  1. Pushing (applied force)
  2. Static electricity (electrostatic force)
  3. Gravity
  4. Kinetic energy

Activity 4: Fill in the Blanks

  1. The force that pulls things toward Earth is gravity.
  2. Moving objects have kinetic energy.
  3. Mass means more matter in an object.
  4. Opposite charges attract each other.
  5. Friction is a force that acts between two surfaces and opposes motion.
  6. Like poles of magnets repel each other.

Activity 5: True or False

  1. FALSE
  2. TRUE
  3. TRUE
  4. TRUE
  5. TRUE
  6. TRUE

Activity 6: Label the Diagram

  • Left top box: wire
  • Left bottom box: iron nail
  • Right top box: battery
  • Right bottom box: switch

Activity 7: Short Answer

  1. Friction and tension (or pushing/pulling)
  2. At the top of the hill
  3. Everything would float away into space, and Earth would have no atmosphere.

Activity 8: Think and Solve

  • Working:
$$ \text{Weight} = \text{mass} \times g = 2\text{ kg} \times 9.8\text{ N/kg} = 19.6\text{ N} $$
  • Your answer: \(19.6\text{ N}\)