A rocket has to overcome the force of gravity in order to move skyward. This force pulls the rocket downward and needs to be overcome by the thrust generated by the rocket's engines in order to achieve lift-off.
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A lever overcomes the force required to move an object by using its mechanical advantage to amplify the input force. This allows an individual to lift or move heavy objects with less effort.
Inertia can be overcome by applying an external force to an object. The greater the force applied, the quicker the object's inertia can be overcome. Once the external force is greater than the object's inertia, it will begin to move or change its speed/direction.
Propulsion is the force that moves an object forward. It is the result of applying force to the object in the opposite direction it needs to move. For example, in a rocket, propulsion is generated by expelling propellant gases backwards, causing the rocket to move forward.
The type of force needed to overcome the inertia of an object is an external force. Inertia is the tendency of an object to resist changes in its motion, so an external force is required to overcome this resistance and cause the object to move.
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