Interaction Of Force And Motion Quiz

The first law of Newton's laws, also known as the law of inertia, states that any object at rest will stay at rest unless acted upon by an unbalanced force, and any object in motion will continue to stay in motion unless acted upon by an unbalanced force. This law describes the tendency of objects to resist changes in their state of motion, either staying at rest or maintaining their velocity. It highlights the concept of inertia, which is the property of matter to resist changes in motion.

Balanced forces occur when the forces acting on an object are equal in magnitude and opposite in direction, resulting in zero net force.  A book resting on a table is correct because when a book is resting on a table, the force of gravity pulling the book downward is balanced by the normal force exerted by the table upward. In this scenario, the book remains stationary due to the equilibrium between the gravitational force and the normal force.

Frictional forces always oppose the relative motion or tendency of motion between two surfaces in contact. Friction arises due to the microscopic irregularities present on the surfaces, which interact and resist the motion of the objects. This resistance can manifest as kinetic friction (between moving surfaces) or static friction (between stationary surfaces), depending on the circumstances. The direction of frictional force is always opposite to the direction of motion or the intended motion of the object.

According to Newton's first law of motion, also known as the law of inertia, an object will remain at rest or continue moving with constant velocity unless acted upon by an external force. In other words, if the net force acting on an object is zero, its motion will not change. This principle underscores the concept of inertia, which is the tendency of objects to resist changes in their state of motion.

Newton's second law of motion states that the acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass. Mathematically, this relationship is expressed as F = ma, where F represents the net force, m is the mass of the object, and a is its acceleration.

The SI unit of force is the newton (N), named after Sir Isaac Newton, who formulated the laws of motion. One newton is defined as the force required to accelerate a one-kilogram mass by one meter per second squared. This unit provides a standardized measure of force in the International System of Units (SI) and is widely used in scientific contexts.

Gravity is an example of a distance force because it acts on objects regardless of their physical contact. It is the force that pulls objects towards the center of the Earth, even when they are not in direct contact with it. In the given options, holding a book in your hand, a boy riding a bike, and a car pulling a trailer are all examples of contact forces, as they require physical contact between objects. Therefore, the correct answer is gravity from the Earth pulling you down.

The given statement is false. A net force is not a force between two objects that are touching one another. Instead, it is the overall force acting on an object, taking into account all the individual forces acting on it. These individual forces can be contact forces or non-contact forces, and they can act on different objects. Therefore, the net force is not limited to forces between touching objects.

When graphing speed, the time (independent variable) is plotted on the X axis. The X axis represents the horizontal axis of the graph and is used to measure and display the independent variable, which in this case is time. By plotting time on the X axis, we can observe how the speed of an object changes over a specific period of time.

 Non-contact forces act on objects without direct physical contact between them. Electrostatic force, also known as the force of static electricity, is a prime example of such a force. It occurs between charged particles or objects and can attract or repel them based on their electric charges. Other examples of non-contact forces include magnetic force (which acts on magnetic materials) and gravitational force (which acts over large distances between masses).