GCSE Physics: Resultant forces (video)

Resultant forces and free-body diagrams — Paper 2 Forces — from freesciencelessons. Each card deep-links to the video.

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Define resultant force.
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A single force that has the same effect as all of the original forces acting together.
Why are forces vector quantities?
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Because they have both magnitude (size) and direction.
How do you calculate the resultant force when two forces act in opposite directions along a straight line?
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Subtract the smaller force from the larger force.
A man pushes a box with 20 N to the right while friction is 10 N to the left. What is the resultant force?
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10 Newtons acting to the right.
What is the resultant force when balanced forces act on an object?
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Zero.
In a free-body diagram, the object is shown as a ?.
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point
In a free-body diagram, what do the length and direction of an arrow represent?
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The length shows the size (magnitude) of the force, and the direction shows the direction of the force.
The upward force on an aeroplane that balances its weight is called ?.
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lift
The forward force provided by an aeroplane's engines is called ?.
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thrust
A car has a driving force of 10,000 N left, friction of 4,000 N right, and air resistance of 5,000 N right. What is the resultant force?
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1,000 Newtons acting to the left.

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