Chapter 2: Forces and Motion

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Physics

Speed

Graphs of motion

Acceleration

Centripetal Forces

Velocity

Newton's Laws

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28 Terms

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Define distance.
It is the measure of how far an object has travelled.
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Define time.
It is the measure of how long an object has been travelling for.
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Define weight.
It is the gravitational force on an object.
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Define upthrust.
It is the upward force from a liquid or gas that makes things float.
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Define dynamic.
It is defined as the opposing force that comes into play when one body is actually moving over the surface of another body.
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Define friction.
It is the force that opposes the motion of one material sliding past each another.
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Define speed.
It is the rate of motion of an object in any direction.
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Define tension.
It is the force in a stretched material.
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Define air resistance.
It is another type of friction.
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What is parallelogram rule?
It is the is method of finding the resultant in situations, where the vectors are not in line.
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What is the unit of force?
Newtons (N)
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Newton
________ noted that when the same force acted for the same time on different masses, a large mass would gain less velocity than a smaller one, but the change in "mass x velocity "was the same in every case.
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downward pull
It is the ________ from Earth.
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acceleration of free fall
G is the ________ (10 metres per second^2)
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U
________ "is the initial velocity and "v "is the final velocity.
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What is total kinetic energy?
If a collision is elastic, the total kinetic energy of the moving objects is the same after the collision as before.
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What is earth's gravitational field strength?
It is 10 newtons per kilogram.
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What does gradient of speed time graph give?
The gradient of the line is numerically equal to acceleration.
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What does gradient of distance time graph give?
The gradient of the line is numerically equal to the speed.
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What is frictional force?
It is defined as the force that acts between the surfaces when they are at rest with respect to each other.
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How is force measured?
It can be measured using a spring balance.
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kinetic energy
Moving objects have ________.
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SI unit of force
________ is Newton (N)
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What is meant by uniform acceleration?
It means a constant (steady) acceleration.
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State newtons second law of motion.
It is the link between a resultant force and the rate of change of momentum
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total kinetic energy
The ________ is less after the collision than before.
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NOTE
this is newtons second law
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Q
To find the resultant of two vectors (for example, forces of 30 N and 40 N acting at a point O, as in the diagram below)