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Worksheet StudioPractice pack · Ages 7-9
Forces, friction & magnetism
Take your time. Show your thinking.
1. If a 50 N forward thrust acts on a model boat against 20 N of water resistance, what is the resultant forward force: 30 N or 70 N?
N [Magnet] S → Magnetic Pull / Friction · Opposite poles attract (N ↔ S)
2. What happens when the north pole of one magnet is brought close to the north pole of another magnet: they repel or they attract?
N [Magnet] S → Magnetic Pull / Friction · Opposite poles attract (N ↔ S)
3. What device is made by wrapping a coil of insulated wire around a soft iron core and passing an electric current through the wire: an electromagnet or a barometer?
N [Magnet] S → Magnetic Pull / Friction · Opposite poles attract (N ↔ S)
4. What upward force from water pushes on a floating boat to balance its weight: upthrust (buoyancy) or tension?
N [Magnet] S → Magnetic Pull / Friction · Opposite poles attract (N ↔ S)
5. Which instrument containing a calibrated spring is used in science labs to measure forces in newtons: a newtonmeter (spring balance) or a ruler?
N [Magnet] S → Magnetic Pull / Friction · Opposite poles attract (N ↔ S)
6. What happens to an object already moving at constant velocity in a straight line if the resultant force acting on it is zero: it continues at the same constant velocity, or it stops instantly?
N [Magnet] S → Magnetic Pull / Friction · Opposite poles attract (N ↔ S)
7. Which group of three metallic elements are strongly ferromagnetic at room temperature: iron, nickel and cobalt, or gold, silver and copper?
N [Magnet] S → Magnetic Pull / Friction · Opposite poles attract (N ↔ S)
8. How can you make an electromagnet stronger: increase the number of wire turns or the current, or replace the iron core with wood?
N [Magnet] S → Magnetic Pull / Friction · Opposite poles attract (N ↔ S)
9. Why does a freely suspended magnetic compass needle align north–south: Earth itself has a magnetic field, or wind pushes the needle?
N [Magnet] S → Magnetic Pull / Friction · Opposite poles attract (N ↔ S)
10. Why do bicycle brakes press rubber pads against the wheel rim: to increase friction and slow the wheel, or to reduce gravity?
N [Magnet] S → Magnetic Pull / Friction · Opposite poles attract (N ↔ S)
11. Which force pulls objects toward the centre of the Earth and gives them weight: gravity or friction?
N [Magnet] S → Magnetic Pull / Friction · Opposite poles attract (N ↔ S)
12. Outside a bar magnet, in which direction do magnetic field lines point by convention: from the north pole to the south pole, or from south to north?
N [Magnet] S → Magnetic Pull / Friction · Opposite poles attract (N ↔ S)
12 questions · Seed 44 · Age guidance, not curriculum certification
View the answer key
Worksheet StudioAnswer key · Ages 7-9
Forces, friction & magnetism
Answers and reasoning. Review before teaching.
1. If a 50 N forward thrust acts on a model boat against 20 N of water resistance, what is the resultant forward force: 30 N or 70 N?
30 N
Opposing forces subtract: 50 N − 20 N = 30 N forward.
2. What happens when the north pole of one magnet is brought close to the north pole of another magnet: they repel or they attract?
They repel
Like magnetic poles (north–north or south–south) repel each other.
3. What device is made by wrapping a coil of insulated wire around a soft iron core and passing an electric current through the wire: an electromagnet or a barometer?
Electromagnet
Electric current flowing through a solenoid around an iron core creates a controllable electromagnet.
4. What upward force from water pushes on a floating boat to balance its weight: upthrust (buoyancy) or tension?
Upthrust (buoyancy)
Displaced water exerts an upward buoyant force (upthrust) equal to the weight of a floating boat.
5. Which instrument containing a calibrated spring is used in science labs to measure forces in newtons: a newtonmeter (spring balance) or a ruler?
Newtonmeter (spring balance)
A newtonmeter measures force from the extension of its internal spring.
6. What happens to an object already moving at constant velocity in a straight line if the resultant force acting on it is zero: it continues at the same constant velocity, or it stops instantly?
It continues at the same constant velocity
By Newton’s first law, zero resultant force means zero acceleration, so velocity remains constant.
7. Which group of three metallic elements are strongly ferromagnetic at room temperature: iron, nickel and cobalt, or gold, silver and copper?
Iron, nickel and cobalt
Iron, nickel and cobalt (and alloys like steel) are strongly attracted to magnets.
8. How can you make an electromagnet stronger: increase the number of wire turns or the current, or replace the iron core with wood?
Increase the number of wire turns or the current
More coil turns and higher electric current strengthen the magnetic field.
9. Why does a freely suspended magnetic compass needle align north–south: Earth itself has a magnetic field, or wind pushes the needle?
Earth itself has a magnetic field
The compass needle aligns with Earth’s geomagnetic field.
10. Why do bicycle brakes press rubber pads against the wheel rim: to increase friction and slow the wheel, or to reduce gravity?
To increase friction and slow the wheel
Friction between the brake pads and rim converts kinetic energy into thermal energy, slowing the bike.
11. Which force pulls objects toward the centre of the Earth and gives them weight: gravity or friction?
Gravity
Earth’s gravitational field pulls all masses toward Earth’s centre.
12. Outside a bar magnet, in which direction do magnetic field lines point by convention: from the north pole to the south pole, or from south to north?
From the north pole to the south pole
Magnetic field lines point in the direction a compass north pole would point: from north to south.
12 questions · Seed 44 · Age guidance, not curriculum certification
Worksheet StudioPractice pack · Ages 7-9
Forces, friction & magnetism
Take your time. Show your thinking.
1. If a 50 N forward thrust acts on a model boat against 20 N of water resistance, what is the resultant forward force: 30 N or 70 N?
N [Magnet] S → Magnetic Pull / Friction · Opposite poles attract (N ↔ S)
2. What happens when the north pole of one magnet is brought close to the north pole of another magnet: they repel or they attract?
N [Magnet] S → Magnetic Pull / Friction · Opposite poles attract (N ↔ S)
3. What device is made by wrapping a coil of insulated wire around a soft iron core and passing an electric current through the wire: an electromagnet or a barometer?
N [Magnet] S → Magnetic Pull / Friction · Opposite poles attract (N ↔ S)
4. What upward force from water pushes on a floating boat to balance its weight: upthrust (buoyancy) or tension?
N [Magnet] S → Magnetic Pull / Friction · Opposite poles attract (N ↔ S)
5. Which instrument containing a calibrated spring is used in science labs to measure forces in newtons: a newtonmeter (spring balance) or a ruler?
N [Magnet] S → Magnetic Pull / Friction · Opposite poles attract (N ↔ S)
6. What happens to an object already moving at constant velocity in a straight line if the resultant force acting on it is zero: it continues at the same constant velocity, or it stops instantly?
N [Magnet] S → Magnetic Pull / Friction · Opposite poles attract (N ↔ S)
7. Which group of three metallic elements are strongly ferromagnetic at room temperature: iron, nickel and cobalt, or gold, silver and copper?
N [Magnet] S → Magnetic Pull / Friction · Opposite poles attract (N ↔ S)
8. How can you make an electromagnet stronger: increase the number of wire turns or the current, or replace the iron core with wood?
N [Magnet] S → Magnetic Pull / Friction · Opposite poles attract (N ↔ S)
9. Why does a freely suspended magnetic compass needle align north–south: Earth itself has a magnetic field, or wind pushes the needle?
N [Magnet] S → Magnetic Pull / Friction · Opposite poles attract (N ↔ S)
10. Why do bicycle brakes press rubber pads against the wheel rim: to increase friction and slow the wheel, or to reduce gravity?
N [Magnet] S → Magnetic Pull / Friction · Opposite poles attract (N ↔ S)
11. Which force pulls objects toward the centre of the Earth and gives them weight: gravity or friction?
N [Magnet] S → Magnetic Pull / Friction · Opposite poles attract (N ↔ S)
12. Outside a bar magnet, in which direction do magnetic field lines point by convention: from the north pole to the south pole, or from south to north?
N [Magnet] S → Magnetic Pull / Friction · Opposite poles attract (N ↔ S)
12 questions · Seed 44 · Age guidance, not curriculum certification
Worksheet StudioAnswer key · Ages 7-9
Forces, friction & magnetism
Answers and reasoning. Review before teaching.
1. If a 50 N forward thrust acts on a model boat against 20 N of water resistance, what is the resultant forward force: 30 N or 70 N?
30 N
Opposing forces subtract: 50 N − 20 N = 30 N forward.
2. What happens when the north pole of one magnet is brought close to the north pole of another magnet: they repel or they attract?
They repel
Like magnetic poles (north–north or south–south) repel each other.
3. What device is made by wrapping a coil of insulated wire around a soft iron core and passing an electric current through the wire: an electromagnet or a barometer?
Electromagnet
Electric current flowing through a solenoid around an iron core creates a controllable electromagnet.
4. What upward force from water pushes on a floating boat to balance its weight: upthrust (buoyancy) or tension?
Upthrust (buoyancy)
Displaced water exerts an upward buoyant force (upthrust) equal to the weight of a floating boat.
5. Which instrument containing a calibrated spring is used in science labs to measure forces in newtons: a newtonmeter (spring balance) or a ruler?
Newtonmeter (spring balance)
A newtonmeter measures force from the extension of its internal spring.
6. What happens to an object already moving at constant velocity in a straight line if the resultant force acting on it is zero: it continues at the same constant velocity, or it stops instantly?
It continues at the same constant velocity
By Newton’s first law, zero resultant force means zero acceleration, so velocity remains constant.
7. Which group of three metallic elements are strongly ferromagnetic at room temperature: iron, nickel and cobalt, or gold, silver and copper?
Iron, nickel and cobalt
Iron, nickel and cobalt (and alloys like steel) are strongly attracted to magnets.
8. How can you make an electromagnet stronger: increase the number of wire turns or the current, or replace the iron core with wood?
Increase the number of wire turns or the current
More coil turns and higher electric current strengthen the magnetic field.
9. Why does a freely suspended magnetic compass needle align north–south: Earth itself has a magnetic field, or wind pushes the needle?
Earth itself has a magnetic field
The compass needle aligns with Earth’s geomagnetic field.
10. Why do bicycle brakes press rubber pads against the wheel rim: to increase friction and slow the wheel, or to reduce gravity?
To increase friction and slow the wheel
Friction between the brake pads and rim converts kinetic energy into thermal energy, slowing the bike.
11. Which force pulls objects toward the centre of the Earth and gives them weight: gravity or friction?
Gravity
Earth’s gravitational field pulls all masses toward Earth’s centre.
12. Outside a bar magnet, in which direction do magnetic field lines point by convention: from the north pole to the south pole, or from south to north?
From the north pole to the south pole
Magnetic field lines point in the direction a compass north pole would point: from north to south.
12 questions · Seed 44 · Age guidance, not curriculum certification