Table of Contents
How is force related to weight and mass?
The weight of an object is the force of gravity on the object and may be defined as the mass times the acceleration of gravity, w = mg. Since the weight is a force, its SI unit is the newton. Density is mass/volume.
Is weight a force or mass?
In common usage, the mass of an object is often referred to as its weight, though these are in fact different concepts and quantities. In scientific contexts, mass is the amount of “matter” in an object (though “matter” may be difficult to define), whereas weight is the force exerted on an object by gravity.
Why do objects eventually stop moving?
Every day you see moving objects come to a stop. The force that brings nearly everything to a stop is friction,which is the force that acts to resist sliding between two touch- ing surfaces, as shown in Figure 3. Friction is why you never see objects moving with constant velocity unless a net force is applied.
What is the opposite of the speed of light?
There is no opposite to the speed of light. The answer that you got is not a very good one. Particles travel differently through space and time depending on whether or not they are massive or massless.
Can relative velocity be greater than speed of light?
Suppose two particles are moving away from each other in opposite directions, with the same speed, along some line. This relative velocity will be greater than the speed of light, c, whenever v is greater than c/2. But the theory of relativity does more than merely assert by fact that nothing goes faster than light.
At what speed does relativity become important?
30,000 km/s
What is opposite of speed?
Opposite of the rapidity of movement or action. slowness. sluggishness. tardiness. dilatoriness.
Do you need to continue applying force on an object to keep it moving?
In order for there to be continuous motion, there must always be a force acting on it. Why some people say it’s true: Any object which moves eventually comes to stop. Thus, to keep it in motion, a force must be applied.
Why is simultaneity relative?
The two people do not actually observe the lightning strike at the same time. Even at the speed of light, the image of the strike takes time to reach each observer, and, since each is at a different distance from the event, the travel… … theory of relativity implies that simultaneity is relative to a frame of axes.
What happens when two objects collide?
Newton’s third law of motion is naturally applied to collisions between two objects. In a collision between two objects, both objects experience forces that are equal in magnitude and opposite in direction. Such forces often cause one object to speed up (gain momentum) and the other object to slow down (lose momentum).
What causes the ball to slow down and eventually stopped?
So why do things in motion slow down and a stop after a while? The answer is “friction.” Friction is another kind of force. Friction is two things rubbing or sliding against each other. The rubbing, or friction, between the ball and the rug is what makes the ball stop rolling.
What is C in special relativity?
In relativity, any reference frame moving with uniform motion will observe the same laws of physics. In particular, the speed of light in vacuum is always measured to be c, even when measured by multiple systems that are moving at different (but constant) velocities.
Is speed of light relative?
There is a critical caveat attached to the theory of Special Relativity: all speeds are relative, except for the speed of light, which is absolute. The speed of light is absolute; that means it is the same seen by any observer, no matter how fast the observer is moving relative to the light source.
Does it take a stronger force to slow something down than to speed it up?
For example if a ball is hit harder, it will speed up faster. If an object must be slowed down quickly, the force applied to the object must be greater than what is needed for a gradual slowing down. For example, the greater the force applied to the brakes of a bicycle, the more quickly it will slow down or stop.
What causes objects to slow down when they are no longer pushed?
Draw conclusion: What causes objects to slow down when they are no longer pushed? The reason why the objects started to slow down when they were no longer pushed was because there was friction acting on the wheels, causing the object to slow down and eventuallystop.
At what speed does time dilation become noticeable?
300,000 km per second
What is the relationship between force and mass and acceleration?
The greater the force that is applied to an object of a given mass, the more the object will accelerate. For example, doubling the force on the object doubles its acceleration. The relationship between mass and acceleration is different. It is an inverse relationship.
What is the force that pulls an object?
gravity: The force of attraction which the earth exerts on objects on or near its surface, pulling them downwards. It is also the force of attraction between any two objects.
What force attracts objects with mass?
gravitational force
What if I push an object which is already moving horizontally?
Thus, force would cause. acceleration in horizontal motion.
What is the relationship between force and mass?
A: Force is mass times acceleration, or F= m x a. This means an object with a larger mass needs a stronger force to be moved along at the same acceleration as an object with a small mass. This is Newton’s Second Law of Motion.