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Unit CF Terms
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Terms in this set (14)
unbalanced force
when the total strength of all the forces being applied in one direction is bigger than the total strength being applied in the opposite direction
net force
the single force acting on an object that causes its motion to be exactly the same as when a combination of forces act on the same object
newtons second law and net force
rate of change of speed=strength of net force/mass of object
if a balanced force acts on an object
its speed and direction of motion will remain constant
newtons third law
when one object exerts a force on another, the second object exerts a force on the first that is equal in strength and in the opposite direction
if a non-zero net force acts on an object at rest
the object will begin to move in the direction of the net force
if a non-zero net force acts on an object in the same direction as its motion
the object's speed will increase
if a non-zero net force acts on an object in the direction opposite to its motion
the object's speed will decrease; it may even stop and reverse directions if strong enough
if a balanced combination of forces acts on an object in motion
then the path of the object will be a straight line
the greater the strength of the net force
the higher the rate of change of the object's speed
the more mass an object has
the lower the rate of change of speed
air resistance/drag
if an object moves through the air horizontally or vertically, it exists. it depends on the speed of the object and the surface area
the faster an object moves
the greater the strength of drag
the greater the surface area
the greater the drag
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An object is moving along a straight line, and the uncertainty in its position is 2.5 m. (a) Find the minimum uncertainty in the momentum of the object. Find the minimum uncertainty in the object's velocity, assuming that the object is (b) a golf ball (mass=0.045 kg) and (c) an electron.
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Sand from a stationary hopper falls onto a moving conveyor belt at the rate of 5.00 kg/s. The conveyor belt is supported by frictionless rollers and moves at a constant speed of v = 0.750 m/s under the action of a constant horizontal external force $\overrightarrow{\mathbf{F}}_{\text {ext }}$ supplied by the motor that drives the belt. Find (a) the sand's rate of change of momentum in the horizontal direction, (b) the force of friction exerted by the belt on the sand, (c) the external force $\mathbf{F}_{\text {ext }},$ (d) the work done by $\overrightarrow{\mathbf{F}}_{\text {ext }}$ in 1 s, and (e) the kinetic energy acquired by the falling sand each second due to the change in its horizontal motion. (f) Why are the answers to parts (d) and (e) different?
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In the spin-dry cycle of a modern washing machine, a wet towel with a mass of 1.50 kg is "stuck to" the inside surface of the perforated (to allow the water out) washing cylinder. To have decent removal of water, damp/wet clothes need to experience a centripetal acceleration of at least 10 g. Assuming this value, and that the cylinder has a radius of 35.0 cm, determine the constant angular acceleration of the towel required if the washing machine takes 2.50 s to achieve its final angular speed.
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