IB Physics Glossary
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have magnitude and direction. Direction or changes in direction have an effect on vector quantities. Examples include displacement, velocity, acceleration, force, momentum and field strength.
Visual binary stars
are stars of a system that are visible as separate stars (with unaided eye or through a telescope/binoculars)
measures potential difference across a component. It is placed parallel to the component. An ideal voltmeter has infinite resistance so that no current flows through it.