balanced and unbalanced forces · 06/10/2014 · types of forces (continued) •net force – the...
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Balanced and Unbalanced Forces
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What is a force?
• A force is a push or pull that causes an object to move, stop, or change direction
• Has a size and a direction
• In physics a force is anything that makes an object accelerate (remember: acceleration in science can mean speed up, slow down, change direction or change speed & direction!)
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How do we measure force?
• The spring scale is the instrument used to measure force.
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• The units of measurement for force are newtons (N). Who is it named in honor of?
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Mass Vs. Weight • Mass is the amount of matter in an object.
• The tool we use to measure mass is the Triple beam balance.
• The units used to measure mass are grams (g).
• Weight is the measure of gravitational force on an object.
• We measure weight with a spring scale.
• Since weight is a measure of 1 type of force,
the unit for weight in science is the newton.
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Balanced and Unbalanced Forces
• Forces occur in pairs and they can be either balanced or unbalanced.
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Balanced Forces
• Balanced forces do not cause change in motion
• They are equal in size and opposite in direction
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Examples of Balanced Forces
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Unbalanced Forces
• Unbalanced forces are NOT equal in size. • An unbalanced force always causes a
change in motion! This can be a change in speed, direction or both.
• When unbalanced forces act in opposite
directions you can find the net force. To find the net force, you
• Calculate the Magnitude of the force. This is the
difference between the two forces, so you subtract the smaller force from the larger one.
• Determine the direction of the net force. The direction
of the largest force is the direction of the force (IF they are going in opposite).
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Examples of Unbalanced Forces
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Unbalanced Forces
6 N, left – 3 N, right = 3N, left
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Unbalanced Forces
10 N, right – 4 N, left = 6N, right
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Unbalanced Forces
5 N, right + 10 N, right = 15N, right
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Balanced or Unbalanced Forces?
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Types of Forces
• Gravitational Force (Gravity) – is the force of attraction between objects due to their masses.
• Friction – the force that exists when there is contact between 2 surfaces (It opposes motion)
• Applied force – force that is applied to an object by a person or another object.
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Types of Forces (continued)
• Net force – the combined effect of all forces acting on an object.
• Balanced – Forces are balanced when they act on an object in opposite directions and are equal in size (no change in the position, speed, or direction of motion of the object).
• Unbalanced – opposing forces that are not equal (causes change in position, direction, or speed).