Forces Quiz

Ice has the lowest friction among the given surfaces. This is because ice has a smooth and slippery surface, which reduces the resistance between objects moving on it. The low friction of ice makes it easier for objects to slide or glide across its surface with minimal force or effort.

Friction is a force that resists the motion of objects sliding or rolling against each other. On a flat surface, friction acts against the direction of movement, making it harder—not easier—for objects to move. The greater the friction, the more force is required to move the object. Reducing friction (such as by using wheels or lubrication) can make objects easier to move. Therefore, friction generally makes it more difficult to move objects on a flat surface.

The force that allows cars to move is not air resistance, but rather the force of the engine or motor that propels the car forward. Air resistance, also known as drag, is a force that opposes the motion of the car and acts in the opposite direction of its movement. It is caused by the collision of the car with air molecules as it moves through the atmosphere.

Gravity is the force that affects the Earth's tides. The gravitational pull of the Moon and the Sun on the Earth's oceans causes the tides. The Moon's gravity is stronger because it is closer to the Earth, so it has a greater influence on the tides. The gravitational force causes the water to bulge on the side of the Earth facing the Moon, creating a high tide, and a second bulge on the opposite side, creating a low tide. This gravitational force is responsible for the regular rise and fall of the tides.

Cabins in aircraft must be pressurized because of a lack of air pressure or atmospheric pressure outside the aircraft. Without pressurization, the low air pressure at high altitudes would make it difficult for passengers and crew to breathe and could lead to altitude sickness or even hypoxia. Pressurizing the cabin allows for a comfortable and safe environment by maintaining a similar air pressure to what we experience at ground level.

The forces acting on a skateboard when it is moving are friction, gravity, and pushing. Friction is the force that opposes the motion of the skateboard and helps it to slow down or stop. Gravity is the force that pulls the skateboard downward, keeping it grounded and affecting its speed and acceleration. Pushing is the force applied by the skateboarder's foot to generate forward motion. These forces work together to allow the skateboard to move and maintain its motion.