What does it mean to be stationary? - Physics Stack Exchange
2013年11月28日 · What do we regard a stationary. Do we mean an object that is not moving noticeable from the viewers perspective because then a parked car would be considered stationary, but (assuming it's on earth) the earth is rotating and those at the circumference where the spin is greatest are traveling 1 038 mph and the earth itself is moving with the ...
Stationary object, constant velocity? - Physics Forums
2014年3月2日 · FAQ: Stationary object, constant velocity? What is a stationary object? A stationary object is an object that is not moving or changing position. It remains in the same place with respect to its surroundings. What does constant velocity mean? Constant velocity means that an object is moving at a steady rate without any changes in its speed or ...
How can gravity act as a force on stationary objects - Physics Forums
2013年3月8日 · It doesn't really matter whether the object is moving or not. If the object is stationary or moving at constant speed, then the sum of all forces must be zero. When object is on e.g. the surface of the Earth or on a table there is always normal force preventing the object from sinking through the surface as per Newton's III law.
When an in-motion object collides with a stationary object does …
2021年9月11日 · When an in-motion object collides with a stationary object, does that necessarily mean that the in-motion object will always become stationary after the collision ? Not necessarily. It depends on the relative masses of the objects and the coefficient of restitution of the collision.
Newton's Third Law: Equal Forces & Stationary Object? - Physics …
2015年10月31日 · In the case of a stationary object, the object exerts an equal and opposite force on the object pushing against it, resulting in no movement. Does Newton's Third Law apply to all forces? Yes, Newton's Third Law applies to all forces, whether they are contact forces (pushing, pulling) or non-contact forces (gravity, magnetism).
What are stationary objects? - Answers
2024年5月25日 · Stationary objects are objects that are not moving or changing position relative to a reference point. They appear to be at rest and have no velocity. Examples of stationary objects include a ...
momentum - Calculating force of impact - Physics Stack Exchange
By Newton's third law, the traveling object applies an equal and opposite force to the stationary object: $\vec{F}_{S \hspace{1mm}on\hspace{1mm} T} = -\vec{F}_{T \hspace{1mm}on\hspace{1mm} S}$. So there is a force on the stationary object by the traveling object. If you have velocity as a function of time you can find the instantaneous force
newtonian mechanics - Work done on an object that is stationary ...
2024年4月5日 · Instead this energy due to work by the motion of the hand becomes thermal energy at the stationary interface between the hand and the object. This thermal energy disperses in various directions and raises the temperature of both the sander drum and the block by conduction and also disperses into the surrounding air by conduction, convection and ...
Is there anything truly "stationary" in the universe? [closed]
2023年3月1日 · The word "stationary" in the modern (post-Newton) physics requires a reference frame: Object A is stationary relative to e.g. a non-rotating frame attached to the center of mass of the object B. The laws of physics themselves don't distinguish between the reference frames, they are all made equal.
Is two cars colliding at 50mph the same as one car colliding into a ...
Well, from a stationary reference frame, after the crash both cars remain at rest, so the kinetic energy dissipated is $2\times \frac{1}{2}mv^2$. From the reference frame moving with the first car, the kinetic energy before the crash is $\frac{1}{2}m(2v)^2=4\times\frac{1}{2}mv^2$, but after the crash the cars do not remain at rest, but keep ...