In this experimental paper (preprint), the author analyzes how relativity of angular momentum and of inertia of rotating bodies may work physically (not mathematically). For example, all bodies, including astronauts, inside the International Space Station, have colossal moments of inertia and colossal angular momentums which are physical properties of rotating bodies. These physical properties both depend on radii of rotation. All orbital trajectories have very large radii of rotation. However, the astronauts can easily move any bodies inside the International Space Station despite their colossal angular momentums and colossal moments of Inertia. The astronauts' capability to overcome the colossal inertial resistance of the bodies in the International Space Station is explained by relativity of angular momentum and of moment of Inertia. The relativity of the momentum and of the inertia of the bodies inside the International Space Station is just a statement. The statement is mostly based on different frames of reference. Though, a frame of reference as well as a coordinate system are mathematical conceptions. However, it is unclear how such relativity may work physically. Namely, it is not explained what exactly physically happens with the astronauts' bodies and other bodies so that the astronauts can easily move themselves and other bodies inside the International Space Station. An experiment described in this paper is aimed to understand what happens with not only astronauts' bodies but also other bodies which rotate relatively to each other. Notice that making mathematical manipulations like canceling out variables, for example a variable symbolizing a rotational radius, in physical equations does not remove such physical properties as angular momentum and moment of inertia.

This paper (preprint) is the author’s analytical research of elastic and inelastic collisions (impacts) of two bodies in a linear motion. An experiment (inelastic collision) described in the paper is designed to understand how an additional mass can physically (not in physical formulas) make a final speed increase of one of two colliding bodies. A first body (big block), which is linearly moving at some constant speed, hits a second body (small block) which is motionless. Accelerations of and final speeds of the blocks, and the impact time are measured. Then, some additional mass is assembled to the big block so that a length of the big block can stay the same. Next, the big block (with an added mass) hits the small block keeping the initial speeds of the blocks the same. Accelerations of and final speeds of the blocks, and the impact time are measured. In according to the classical mechanics formulas, a final speed of the small block gets higher if a total mass of the big block is increased, even though the initial speeds of the blocks do not change. However, it is unclear how a mass, which is added to the big block, may physically make an increase of the small block final speed if the initial speeds of and lengths of the colliding blocks do not change. A speed of shock waves is the same in the two blocks if they are made of the same material. Based on the physics of collision, if a length of the small block is less than a length of the big block, then the small block must begin to move when its shock wave returns to the impact area before a shock wave in the big block returns to the impact area. In other words, the small block must begin to move at the same time in the collision with or without an added mass, so the initial speeds of and lengths of the two blocks do not change. Therefore, the physical impact time must be the same for the collision with or without an added mass. Hence, the blocks cannot squeeze each other faster or longer during the physical impact when an added mass is assembled to the big block. In such conditions, the final speed increase of the small block can physically happen in the way that the small block either gets a higher acceleration or accelerates for a longer time after the physical impact between the blocks (with an added mass) ends. The current physics does not explain how physically (not in the formulas) an added mass can make the small block accelerate faster or longer after the physical impact (contact) ends. Therefore, the current collision physics appears not to explain the collision process completely when the small block final speed becomes higher despite the same impact time. The author assumes that maybe the interactions between the particles in the experimental collision may be based on some sort of quantum entanglement, anisotropy, relativity, that is, without any fields, or the energy transfer between fields happens via some sort of quantum entanglement anisotropically. Though, such an assumption requires a supplementary experimental research.

This paper (preprint) shows the author’s analysis which unveils a problem related to the motion of a spinning gyroscope (bicycle wheel). The classical mechanics formula for torque exerted by the angular momentum of a spinning gyroscope (bicycle wheel) tells that a magnitude of the torque is zero when a gyroscope spins at a uniform (constant) angular speed because a gyroscope angular acceleration is zero. Hence, the torque exerted by a gyroscope angular momentum cannot act against a torque exerted by the Earth gravitation based on the formula. The gravitation pulls a gyroscope (bicycle wheel) down to the Earth surface. As a result, the zero torque, which is exerted by a gyroscope angular momentum, cannot prevent the gyroscope from falling from Position #1 to Position #2, see Figure 1. There appears a practical problem - impossibility to calculate a force (torque) needed to change a plane of the spin of the uniformly spinning gyroscope.

In this paper (preprint), the author analyzes how physically (not mathematically) a mass of one of two impacting bodies (metal block and metal ball) may influence a speed (magnitude of velocity) after an impact of the ball. The impact happens when the block gradually accelerates the ball. The impact ends when the block is completely stopped but the ball continues to fly because of its inertia. In according to the classical mechanics formulas, the ball speed after the impact increases if a mass of the block increases. That is, it is enough to only increase a mass of the block in order to increase a final speed of the ball, keeping the same acceleration given by the block to the ball. This is also supported by the kinetic energy transfer from the block to the ball because the kinetic energy depends on a mass. The paper also describes an experiment to check how a final speed of the ball changes depending on a mass of the block. Based on the current physics, interactions between particles of the block and of the ball in an impact area cannot change depending on a mass of the block. Therefore, there is a contradictory situation that the formulas give the ball final speed increase that depends on an additional mass of the block, but the classical mechanics does not explain how the interactions between the particles can cause the speed increase.    If the speed increase after the impact is confirmed experimentally, the author assumes that the interactions between the particles may be based on the quantum entanglement relations (without fields), or the fields of the particles are quantumly entangled. In other words, the kinetic energy is transferred via some quantum entanglement interactions. The entanglement of the particles or their fields gives a chance to explain how the increase of the mass can give the speed increase. However, a series of appropriate experiments is needed to figure it out properly