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A rocket will move upward as long as the thrust is greater than the force of gravity?
Wiki User
∙ 13y ago
Actually for some time even after the thrust is no longer greater than gravity. When the rocket's thrust is greater than gravity, it will be accelerating (its velocity upwards will increase). When the rocket's thrust is no longer greater than gravity, at that moment it will still have an upward velocity, so it will still travel upwards - it will only travel more and more slowly upwards as gravity starts to sap the rocket's upward velocity towards zero. Once its velocity reaches zero, if gravity is still winning over the rocket's thrust (if any), then it will start to fall back towards the ground.
We are assuming a simplistic model (no air resistance, no super-unlucky collisions with meteors, etc.), but this is the basic idea.
Wiki User
∙ 13y ago
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Why does buoyant force act upward?
The buoyant force on an object submerged in a fluid is caused by the pressure difference between the top and bottom of the object. To overcome the gravitational force, the buoyant force acts in the upward direction. The larger pressure at greater depth pushes upward on the object.
The water in a drinking straw does not drip out when you press te top of the straw with your thumb or finger tip?
It's a matter of air pressure that acts on the water. When the straw is uncovered, there are two forces acting on the water inside. There is gravity, pulling the water down, and air pressure. The pressure is about the same on both ends of the straw, but on the top of the straw, the pressure pushes the water downward, and on the bottom of the straw, the pressure pushes upward. Both of the pressures are the same, so the net force is just the force of gravity pulling the water down and out of the straw. When you cover the top of the straw, you block the air from pushing down on the water. In this case, the only forces on the water are the air pressure pushing up, and gravity pulling down. However, the air pressure is a greater force than gravity, and keeps the water in the straw despite gravity's pull.
Why do roofs blow off during a tornado?
There are a few mechanisms. First, the wind going over the upward-pointing roof creates and upward force owing to Bernoulli's principle. The wind may also catch the roof under the eaves or cause a gable to fall inward and pick up the roof from below.
How does the helicopter get its lifting force?
the helicopter pushes forward when the pilot pushes the cyclic control forward. that rotates the blades forward . while pushing forward on the cyclic, the pilot must also pull up on the collective control. that will add pitch to the blades, thrusting the helicopter forward.
Climbing film evaporator with an upward flow?
give two reasons why we must operate the column pressure under 1 ATM or at vacuum condition?
When a rocket lifts off the ground the net force is in upward direction. Is the upward pushing force greater or lesser than the downward pull of gravity.?
Greater
How does a rocket achieve maximum flight?
A rocket (firework) achieves maximum height once the fuel plus upward thrust runs out. Then gravity takes over and the rocket falls back to the ground.
How do action-reaction explain how a rocket lifts off?
As a rocket burns fuel, it expels exhaust gases. When the gases are forced out of the rocket, they exert an equal and opposite force on the rocket. A rocket can rise into the air because the gases it expels with a downward force exert an equal but opposite force on the rocket. As long as this upward pushing force, called thrust, is greater than the downward pull of gravity, there is a net force in the upward direction. As a result, the rocket accelerates upwards.-information from Prentice Hall, Science Explorer: Physical Science
How do action-reaction explain how a rocket lift off?
As a rocket burns fuel, it expels exhaust gases. When the gases are forced out of the rocket, they exert an equal and opposite force on the rocket. A rocket can rise into the air because the gases it expels with a downward force exert an equal but opposite force on the rocket. As long as this upward pushing force, called thrust, is greater than the downward pull of gravity, there is a net force in the upward direction. As a result, the rocket accelerates upwards.-information from Prentice Hall, Science Explorer: Physical Science
How do action-reaction pairs explain how a rocket lifts off?
As a rocket burns fuel, it expels exhaust gases. When the gases are forced out of the rocket, they exert an equal and opposite force on the rocket. A rocket can rise into the air because the gases it expels with a downward force exert an equal but opposite force on the rocket. As long as this upward pushing force, called thrust, is greater than the downward pull of gravity, there is a net force in the upward direction. As a result, the rocket accelerates upwards.-information from Prentice Hall, Science Explorer: Physical Science
How does rocket shoots up while the gravity is strong?
By generating an upward force that's greater than the downward force of gravity. Exactly the same way you walk up stairs while the gravity is strong.
How much thrust does it take to take off from earth into space?
Any amount of thrust that's greater than the weight of the rocket vehicle will lift it off of the ground and accelerate it upward. If you keep it up long enough, the vehicle will be in space.
How do rockets go up into space?
By using rocket fuel. when the rocket fuel mixes with the oxygen, it blows out and pushes the rocket upward. It uses newton's third law and thrust.
What are the forces on the plasticine when it is floating?
Gravity and Upward force. If the upward force is greater than the weight caused by gravity than the plasticine will float.
How come an airplane floats in air?
Essentially there are 4 aerodynamic forces that act on an airplane in flight; these are lift, drag, thrust and gravity (or weight).In simple terms, drag is the resistance of air (the backward force), thrust is the power of the airplane's engine (the forward force), lift is the upward force and gravity is the downward force. So for airplanes to fly, the thrust must be greater than the drag and the lift must be greater than the gravity (so as you can see, drag opposes thrust and lift opposes gravity).This is certainly the case when an airplane takes off or climbs. However, when it is in straight and level flight the opposing forces of lift and gravity are balanced. During a descent, gravity exceeds lift and to slow an airplane drag has to overcome thrust.
How does newton's 3rd law apply to a rocket on take off?
The force of the thrusters pushes the rocket upward, beating the force of gravity.
How do austronauts overcome gravity when leaving earth?
By using rocket motors to apply an upward force to their ship that is greater than the downward force of gravity. Exactly what you do with your leg muscles when you want to propel your own mass up a flight of stairs against the force of gravity.
