what is net force?. all the forces acting on an object
TRANSCRIPT
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What is net force?
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•All the forces acting on an object
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• If the forces acting on an object are going in the same direction, you would _________ them together to get the net force.
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•ADD
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• If the forces are acting on an object are going in opposite direction to each other, you would _________ them together to get the net force.
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•Subtract
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•What is inertia?
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•The tendency of an object to resist a change in its motion
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•The greater the mass of an object will ______ its inertia.
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•increase
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•What is weight?
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• The force of gravity on a person or object on the surface of a planet
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•How can we increase acceleration of an object?
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•Decrease its mass• Increase force
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•What is friction?
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•The force that one surface exerts on another when the two rub together
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•What is rolling friction?
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•Occurs when an object rolls over another object•Example: bike tire on a road
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•What is free fall?
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•Occurs when the only force acting on a falling object is gravity
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•Air resistance is a form of __________
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•Friction
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•The Law of Universal Gravitation states ____________________
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•Any two objects in the universe are attracted to each other
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•What is the formula for momentum
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•Mass x velocity
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•What is force?
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•A push or pull on an object
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–How can you increase momentum?
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• Increase the velocity (speed) of the object• Increase the mass of the
object
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•What is mass?
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•The amount of material (matter) in an object
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•How can you increase friction?
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•Make the surfaces rougher•Example: sand on an icy sidewalk
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•What is gravity?
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•The force that pulls objects toward earth
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•What is Newton’s third law and give an example.
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• For every action there is an equal and opposite reaction
• Example: a hammer hits a nail and the nail exerts a force back on the hammer
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• If forces on an object are balanced,
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• The object will never change its motion (move)
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• If the forces on an object are unbalanced,
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•There will be a change in the objects motion
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•What is the formula that describes Newton’s 2nd law of motion?
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• Acceleration = net force x mass
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•What are two factors that affect gravitational pull?
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•Mass of the objects•The distance between the objects
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• On the arrow below, what does the point of the arrow indicate?
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•The direction of the force
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• On the arrow below, what does the length of the arrow indicate?
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•The strength of the force
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• In what direction is the net force acting?
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•To the left
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• From what direction must force be applied so that forces are balanced?
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•To the left
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• If a third force is applied to the object, in what direction will the object move?
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•Up and to the left