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This net force is capable of accelerating (slowing down) the plane. Net forces always accelerate masses.
This net force is capable of accelerating (slowing down) the plane. Net forces always accelerate masses.
The acceleration of an object is directly proportional to the net force acting upon it. The constant of proportionality is the mass.
F = Force = A push or pull
M = Mass
A = Acceleration = speeding up, slowing down or changing direction
If an object has a net force acting on it, it will accelerate. The object will speed up, slow down or change direction. An unbalanced force (net force) acting on an object changes its speed and/or direction of motion. An unbalanced force is an unopposed force that causes a change in motion. A net force = unbalanced force. If however, the forces are balanced (in equilibrium) and there is no net force, the object will not accelerate and the velocity will remain constant.
A Net Force is an Unbalanced Force
A Net Force is an Unbalanced Force
Unbalanced Forces: Placing a box on the seesaw unbalances it. The weight of the box is the unbalanced or net force which causes the seesaw to accelerate downward until it hits the ground.
Let’s assume that the wheels of a car apply 10 N of force. What is the net force if friction and drag are negligible?
The net force would equal 10 Newtons, forward. The mass will accelerate.
What is the net force if the wheels of the car apply 10 Newtonsbut a parachute applies 7 Newtons in the other direction?
The net force would equal 3 Newtons, forward. The mass will accelerate.
A rocket applies an additional force of 10 Newtons to the 10 Newtons that are applied by the wheels. What is the net force if the parachute continues to apply 7 Newtons in the other direction?
The net force would equal 13 Newtons, forward. The mass will accelerate.
Balanced Forces
Balanced Forces
Balanced Forces: When forces are in balance, acceleration is zero. Velocity is constant and there is no net or unbalanced force. A plane will fly at constant velocity if the acceleration is zero.
Consider a person sliding down a slide at constant velocity. In this example, there is no net force when a mass moves at constant velocity. Although friction is acting on the person, there is no change in velocity and friction is not a net force in this case.
Friction is only a net force if it changes the velocity of a mass. If friction slowed the person down, then there is a net force.
A net force is the sum of all forces acting on an object. A net force is capable of accelerating a mass. For instance, if the wheels of a car push it forward with 5 Newtons and drag is 3 Newtons, the net force above is 2 Newtons, forward. Motion to the right is positive. Motion to the left is negative.
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