The length of the arrow represents the magnitude, and the direction of the arrow the direction of the vector quantity.
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What is a force?
A force is a push or pull that acts on an object due to the interaction with another object.
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What is the difference between contact and non-contact forces?
contact forces – the objects are physically touching
non-contact forces – the objects are physically separated.
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Examples of contact and non-contact forces?
contact forces - friction, air resistance, tension and normal contact force
non-contact forces - gravitational force, electrostatic force and magnetic force
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Force is a ______ quantity.
Force is a VECTOR quantity.
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What is weight?
Weight is the force acting on an object due to gravity.
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Why is there a force of gravity close to earth?
The force of gravity close to the Earth is due to the gravitational field around the Earth.
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The weight of an object depends on the __________ _____ _______ at the point where the object is.
The weight of an object depends on the GRAVITATIONAL FIELD STRENGTH at the point where the object is.
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What equation can be used to calculate the weight of an object?
weight = mass × gravitational field strength
W = mg
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What is weight, mass and gravitational field strength measured in?
weight - N
mass - kg
gravitational field strength - N/kg
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How do we measure weight?
Using a calibrated spring-balance (a newtonmeter).
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What is an objects centre of mass?
The weight of an object may be considered to act at a single point referred to as the object’s ‘centre of mass’.
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What affects the stability of an object?
1. Position of the centre of mass (the lower the centre of mass, the more stable the object)
2. Area of the base (wider base is more stable)
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How do you find the centre of mass of an irregular object?
Plumb line experiment
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What is the resultant force of an object?
When a number of forces acting on an object is replaced by a single force that has the same effect as all the original forces acting together
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How do you draw a free-body diagram?
The object is shown as a point
The forces are drawn as arrows starting at that point
The length of the arrow shows the size of the force + direction of arrow shows direction
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Other cards in this set
Card 2
Front
Give three examples of scalar and vector quantities
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