1. Which of the following best defines a force in a scientific context?
- A. The amount of energy an object possesses.
- B. A push or a pull that can change an object's motion.
- C. The speed at which an object is traveling.
- D. The property of an object to resist changes in its state of motion.
2. Which of the following scenarios is an example of a force requiring physical contact?
- A. The Earth pulling a falling apple downward.
- B. Two magnets repelling each other without touching.
- C. A person pushing a shopping cart to make it move.
- D. A balloon sticking to a wall due to static electricity.
3. What is the key difference between the force of friction and the force of magnetism?
- A. Only magnetism can cause an object to slow down.
- B. Magnetism is a pull, while friction is always a push.
- C. Friction is a contact force, while magnetism is a non-contact force.
- D. Magnetism can only act on certain metals, while friction can act on any object at all.
4. Applying a force to an object can change its motion. Which of the following is NOT a possible change in motion caused by a force?
- A. Changing the object's direction.
- B. Changing the object's mass.
- C. Making the object speed up.
- D. Making the object slow down.
5. The concept of 'action at a distance' is used to describe non-contact forces. What does this phrase mean?
- A. The force is too weak to be measured up close.
- B. The force can influence an object without direct physical touch.
- C. The force only works over very long distances, like between planets.
- D. The force is the result of a chain reaction of objects touching each other.
6. How is magnetic force fundamentally different from gravitational force?
- A. Magnetic force is always weaker than gravitational force.
- B. Magnetic force affects all matter, while gravity only affects metals.
- C. Magnetic force can both attract and repel, while gravity can only attract.
- D. Magnetic force only pushes objects apart, while gravity only pulls them together.
7. A student places two bar magnets on a smooth table. When she pushes them close together, they suddenly slide apart without touching. What is the most likely cause of this?
- A. The magnets were not strong enough to attract each other.
- B. The like poles of the two magnets were facing each other, causing repulsion.
- C. One of the objects was not a magnet and was unaffected by the magnetic field.
- D. The force of gravity pushed the two magnets away from one another.
8. What happens when the north pole of one magnet is brought close to the north pole of another magnet?
- A. The magnets will attract each other.
- B. The magnets will lose their magnetism.
- C. The magnets will repel each other.
- D. Nothing will happen.
9. Which of the following scenarios describes a force that is NOT magnetic?
- A. A compass needle aligning itself with Earth's north.
- B. A piece of paper being held to a steel refrigerator door by a small disc.
- C. Two bar magnets pushing each other apart on a tabletop.
- D. An acorn falling from an oak tree to the ground.
10. A student observes that end 'X' of a bar magnet pulls toward the south pole of another magnet. What will happen if end 'X' is brought near the north pole of the second magnet?
- A. End 'X' will be repelled by the north pole.
- B. End 'X' will also be attracted to the north pole.
- C. The two magnets will not interact.
- D. The polarity of end 'X' will reverse.