forces act in pairs. force engine = thrust friction = drag
TRANSCRIPT
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Forces act in pairs
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Force engine = thrustfriction = drag
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support = gravity
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Horizontal forces acting on a moving carthrust( force of the engine)
drag( air resistance)
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Forces acting on an aeroplane lift, drag, gravity, thrust
L=W and T=Dwhen the plane is flying at a constant velocity
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First Law of Motion: Balanced Forcesbalanced forces = no change in velocity
A stationary object will never move as long as the forces acting on it are balanced.
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Resultant force gives direction of acceleration• The forces acting on an
object moving at a constant velocity(steady speed) are also balanced forces.
• If the object starts to accelerate or decelerate then the forces will no longer be equal or balanced.
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What is happening to the helicopter in each picture?
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Thrust equals weight. Helicopter hovers at a constant altitude.
Weight greater than thrust. Helicopter stays on the helipad or drops in altitude.
Thrust is greater than weight. Helicopter takes off and increases in altitude.