What type of force acts to oppose the motion of an object sliding on a surface?
Explanation: The correct answer is C) Friction. Friction is the force that opposes the motion of an object sliding or moving over a surface. It acts in a direction opposite to the motion and depends on the nature of the surfaces in contact and the normal force between them.
Which of the following forces acts on an object in free fall?
Explanation: The correct answer is A) Gravity. In free fall, the only significant force acting on an object is gravity. Gravity causes the object to accelerate downward at a constant rate due to the gravitational force exerted by the Earth.
What force prevents a book resting on a table from falling through the surface?
Explanation: The correct answer is B) Normal force. The normal force is the force exerted by a surface to support the weight of an object resting on it. In this case, the normal force exerted by the table opposes the downward force of gravity on the book and prevents it from falling through the surface.
Which of the following forces acts on a rope being pulled taut from both ends?
Explanation: The correct answer is D) Tension. Tension is the force that is transmitted through a rope, string, or any other flexible connector when it is pulled taut. In this case, when a rope is being pulled from both ends, the tension force is responsible for transmitting the force along the rope.
What type of force acts on an object submerged in a fluid?
Explanation: The correct answer is D) Buoyant force. When an object is submerged in a fluid, such as water, the upward force exerted by the fluid on the object is called the buoyant force. The buoyant force opposes the force of gravity and is responsible for the apparent loss of weight experienced by the object when submerged.