Motion - Free MCQ Practice Test with solutions, UPSC Lucent

The motion refers to the change in an object's position over time. It can be described in terms of distance traveled or displacement.

Uniform motion refers to the motion of an object at a constant speed in a straight line. A bicycle moving at a constant speed on a straight road is an example of uniform motion.

The SI unit of speed is meter per second (m/s), which represents the distance traveled by an object in one second.

The non-uniform motion refers to the motion of an object when its speed or direction changes. A car slowing down at a traffic light is an example of non-uniform motion.

The formula to calculate average speed is speed = distance ÷ time. It represents the distance traveled per unit of time.

Average speed is calculated by dividing the total distance traveled by the total time taken. In this case, 300 km ÷ 5 hours = 60 km/h.

Velocity is a vector quantity that includes both magnitude (speed) and direction. It describes the rate at which an object's position changes.

Accelerated motion refers to the motion of an object when its speed or direction changes. A ball rolling down a slope experiences accelerated motion due to the force of gravity.

Acceleration is calculated by dividing the change in velocity by the time taken. In this case, the change in velocity is 20 m/s (final velocity) - 0 m/s (initial velocity) = 20 m/s, and the time taken is 4 seconds. Therefore, the acceleration is 20 m/s ÷ 4 s = 5 m/s².

Inertia refers to the tendency of an object to resist any change in its state of motion. It is a property of matter and is related to an object's mass.

According to Newton's first law of motion, an object will remain at rest or in uniform motion unless acted upon by an external force. This principle is also known as the law of inertia.

The amount of friction between two surfaces is primarily affected by the normal force (related to pressure) and the nature of the surfaces (related to their roughness or texture, which can be influenced by material properties like density). Thus, density and pressure (A) are factors that affect friction. The other options—surface area and temperature , mass and velocity and color and texture —are less directly or not typically relevant to determining frictional force.

Newton's second law of motion states that the acceleration of an object is directly proportional to the net force applied to it and inversely proportional to its mass. The formula is F = ma, where F is the force, m is the mass, and a is the acceleration.

Newton's second law of motion states that the acceleration of an object is directly proportional to the net force applied to it and inversely proportional to its mass. The formula is F = ma, where F is the force, m is the mass, and a is the acceleration.

Terminal velocity is the constant velocity reached by a falling object when the drag force (air resistance) becomes equal to the weight of the object. At this point, the net force acting on the object is zero, resulting in no further acceleration.

Momentum is calculated by multiplying an object's mass by its velocity. In this case, momentum = 2 kg × 4 m/s = 8 kg m/s.

The law of conservation of momentum is applicable to collisions between objects. It states that the total momentum of a system of objects remains constant before and after the collision, provided no external forces act on the system.

Projectile motion refers to the curved path followed by an object launched into the air, under the influence of gravity. A ball thrown vertically upwards and then coming back down follows a projectile motion trajectory.

The force of gravity acting on an object is known as weight. It depends on the mass of the object and the acceleration due to gravity.

Frictional force is an example of a contact force. It arises when two surfaces are in contact and resists the relative motion between them.