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Forces act on matter, and can accelerate that matter. Gravity is one of the four fundamental forces (along with the strong interaction or strong force, the weak interaction or weak force, and the electromagnetic force). Gravity creates a curvature in spacetime, and things can "slide" or "fall" down into this curvature. Gravity, which is a fundamental characteristic of all matter, attracts matter and accelerates it if it can. We often refer to the earth sitting in the bottom of a gravity wellout of which we must climb to get into space. We have gravity accelerating us, and the chemical engines of rockets forcing us (or our payloads) up agains that pull of gravity.
Wiki User
∙ 14y ago
Wiki User
∙ 9y agoI guess you mean that the expansion of the Universe is accelerating. That isn't known for sure right now. It is believed that some mysterious substance known as "dark energy" is causing this acceleration. However, not much is known about this substance. Read the Wikipedia article on "dark energy" for more information.
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What kind of force is gravitational force?
Gravitational force is a form of potential energy
Why does a feather fall at the same rate as a ball when both are dropped from the same height and vacuum?
The feather and the ball both experience a gravitational force towards the centre of the earth which scales in proportion to their mass (the force is greater on the ball than on the feather).The force manifests itself as an acceleration which scales in inverse proportion to the mass (the same force would make the feather accelerate faster than the ball).So the proportionalities cancel:in tabular form-relative mass for same force for same gravitating bodyFeather : low : easy acceleration : low coupling to gravityBall : high : sluggish acceleration : higher coupling to gravityin algebraic form -acceleration = force/mass = (const. x mass) / massif the acceleration is the same, so will the kinematics and they will "fall at the same rate".Note that there are actually two kinds of mass in this - inertial (that resists acceleration) and gravitational (that couples to a gravitational field). The fact that these are the same is "deep" and leads to Einstein's Genral Theory of Relativity.
Why is uniform circular motion an example of uniform acceleration?
With no acceleration a body moves at constant speed in a straight line. However to travel a circular path you have to apply a force to bend the path of the object form a straight line into a circle. The application of this force is an acceleration. Note too that because the path is circular, the SAME force is required at all points of the circle this makes the acceleration UNIFORM. If you do not believe this, tie something to the end of a piece of string and swing it round your head in a circle. You will feel the string pulling your hand as you do this, this is the force causing the acceleration.
What is the second law of motions?
Newton's second law of motion pertains to the behavior of objects for which all existing forces are not balanced. The second law states that the acceleration of an object is dependent upon two variables - the net force acting upon the object and the mass of the object. The acceleration of an object depends directly upon the net force acting upon the object, and inversely upon the mass of the object. As the force acting upon an object is increased, the acceleration of the object is increased. As the mass of an object is increased, the acceleration of the object is decreased. === === Newton's second law of motion can be formally stated as follows: The acceleration of an object as produced by a net force is directly proportional to the magnitude of the net force, in the same direction as the net force, and inversely proportional to the mass of the object. This verbal statement can be expressed in equation form as follows: The above equation is often rearranged to a more familiar form as shown below. The net force is equated to the product of the mass times the acceleration.
What is the acceleration of a 10 kg mass if a force of a 68.6 N is used?
The answer could be derived form the simple equation F=ma F-force(N) m-mass(Kg) a-acceleration(ms^*2) 68.6=10xa a=68.6/10 a=6.86 ms^-2
What kind of force is gravitational force?
Gravitational force is a form of potential energy
What is the weakest form of force?
Gravitational force
Is fmg the formula that tells the gravitational attraction between m and the earth?
Yes, the equation is Fg = mg. This means that the force of gravity is equal to the mass times the gravitational acceleration (which is 9.8 m/s2). For example, the force of gravity on a 2 kg object would be 2*9.8, which is 19.6 Newtons. (This comes form the equitation F = ma, substituting g, the gravitational acceleration, for a).
Why does a feather fall at the same rate as a ball when both are dropped from the same height and vacuum?
The feather and the ball both experience a gravitational force towards the centre of the earth which scales in proportion to their mass (the force is greater on the ball than on the feather).The force manifests itself as an acceleration which scales in inverse proportion to the mass (the same force would make the feather accelerate faster than the ball).So the proportionalities cancel:in tabular form-relative mass for same force for same gravitating bodyFeather : low : easy acceleration : low coupling to gravityBall : high : sluggish acceleration : higher coupling to gravityin algebraic form -acceleration = force/mass = (const. x mass) / massif the acceleration is the same, so will the kinematics and they will "fall at the same rate".Note that there are actually two kinds of mass in this - inertial (that resists acceleration) and gravitational (that couples to a gravitational field). The fact that these are the same is "deep" and leads to Einstein's Genral Theory of Relativity.
Which is not caused by gravitational force?
Two atoms come together to form a molecule.
How are Force Acceleration and Mass related?
(Force on an object) = (the object's mass) times (its acceleration)
How does Newtons second law relate to speedometers?
on a push bike, you provide the force, and this produces acceleration (velocity change), in the form acceleration = force/mass a speedometer measures instant velocity
Is weight Weight is measured by using a spring scale?
Weight. Actually, a spring balance measures the downward force form a mass under the local gravitational acceleration, e.g. any mass would weigh less on the moon (about one sixth of that on earth.)
Is measured using a spring scale mass or weight?
Weight. Actually, a spring balance measures the downward force form a mass under the local gravitational acceleration, e.g. any mass would weigh less on the moon (about one sixth of that on earth.)
Why is the theorized that the asteroids did not merge to form a planet?
they are thought to not have merged to form planets due to Jupiters gravitational force preventing them from merging
Why does the moon not get pulled towards the earth?
Allthough moon is pulled by earths gravitational field but due to another forces like centrifugal force of moon which is developed by moon while revolving around earth keep it away form collpsing with earth. Also there are many other bodies in space which neutralize the gravitational pull of earth to moon.
Why is their no atmosphere in the moon?
because the gravitational attraction of moon is very low(about 1/6th of earths') which is not sufficient to hold the air molecules to form atmosphere.
