Exploring Forces and Motion

Javarionna is pushing a box across the floor. Which of the following is an example of a contact force?

• Gravity

• Friction

• Magnetism

• Electricity

Answer explanation

Friction is a contact force because it occurs when two surfaces interact directly, opposing motion. In contrast, gravity, magnetism, and electricity are non-contact forces that act at a distance.

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Emmitt dropped his book, and it fell to the ground. What is the force that pulls the book toward the center of the Earth called?

• Magnetic force

• Gravitational force

• Frictional force

• Electrical force

Answer explanation

The force that pulls objects toward the center of the Earth is called the gravitational force. It is responsible for keeping us grounded and is a fundamental force of nature.

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Jaidan and Gavin are playing soccer. Jaidan kicks the ball towards Gavin, but a strong wind blows the ball off course. Which of the following best describes the force of the wind on the ball?

• Forces that are equal in size and opposite in direction

• Forces that do not change an object’s motion

• Forces that cause a change in an object’s speed or direction

• Forces that cancel each other out

Answer explanation

An unbalanced force causes a change in an object's speed or direction, unlike balanced forces that are equal and opposite, canceling each other out and not affecting motion.

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Jaidan and Gavin are playing with magnets. Which type of force allows the magnets to attract or repel each other without touching?

• Friction

• Tension

• Magnetic

• Normal

Answer explanation

Magnetic forces act at a distance, allowing magnets to attract or repel each other without direct contact. In contrast, friction, tension, and normal forces require physical contact between objects.

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Jaidan and Emmitt are playing with magnets. If they move the magnets farther apart, what happens to the gravitational force between them?

• It increases

• It decreases

• It stays the same

• It disappears

Answer explanation

As two objects are moved farther apart, the gravitational force between them decreases. This is due to the inverse square law of gravitation, which states that force diminishes with the square of the distance between the objects.

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Gavin is playing soccer in the park. The soccer ball is at rest. What must happen for the ball to start moving?

• A balanced force must act on it

• An unbalanced force must act on it

• No force is needed

• Gravity must be removed

Answer explanation

For the soccer ball to start moving, an unbalanced force must act on it. This force can come from a kick or push, overcoming the ball's inertia. Balanced forces would keep it at rest.

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Ra'ni is observing different forces at play in her surroundings. She notices a book sliding on a table, a rope being pulled, an apple falling from a tree, and a kite flying against the wind. Which of the following forces acting in these scenarios is NOT a contact force?

• Friction

• Tension

• Gravity

• Air resistance

Answer explanation

Gravity is a non-contact force that acts at a distance, while friction, tension, and air resistance are all contact forces that require physical interaction between objects.

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Ra'ni and Gavin are playing with a small ball and a large ball. If the mass of the large ball increases, what happens to the gravitational force it exerts?

• It decreases

• It increases

• It stays the same

• It becomes zero

Answer explanation

As per Newton's law of universal gravitation, the gravitational force between two objects increases with the mass of either object. Therefore, if the mass of an object increases, the gravitational force it exerts also increases.

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Ra'ni was riding in a car that suddenly stopped, and she moved forward in her seat. What caused her to move forward?

• Balanced forces

• Unbalanced forces

• No forces

• Friction only

Answer explanation

When the car stops suddenly, your body continues moving forward due to inertia. This is an example of unbalanced forces, where the force of the car stopping is greater than the force keeping you in your seat.

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Which of the following is an example of a force acting at a distance?

• Pushing a door

• Pulling a rope

• Magnetic attraction between two magnets

• Kicking a ball

Answer explanation

The correct choice is 'Magnetic attraction between two magnets' because it demonstrates a force acting at a distance, unlike the other options which require direct contact to exert force.

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