3.1.1 Newton's First Law Flashcards
Newton’s First Law
- Dynamics allows you to understand why objects move the way they do.
- Newton’s first law states that in the absence of a net force, a body at rest stays at rest, and a moving body continues moving in a straight line with constant speed.
- Inertia is the resistance of an object to changes in its state of motion.
- Friction is a ubiquitous force in daily life that brings moving objects to a halt. Everyday experience with friction can make Newton’s first law seem counter intuitive.
- Newton’s first law applies only in inertial reference frames.
Which of the following statements best describes the concept of uniform motion?
In the absence of a net force, a moving body continues moving in a straight line with constant speed.
Which of the following is not a correct description of motion?
The mass of Voyager as it plunges into a black hole.
Which of the following statements best describes an isolated body?
An isolated body is neither pushed nor pulled by unbalanced forces and maintains a uniform, or steady, motion.
Which of the following best states Newton’s First Law of Motion?
In the absence of a net force, a body at rest stays at rest, and a moving body continues moving in a straight line with constant speed.
Which of the following environments presents an inertial reference frame?
The cabin of the spacecraft Voyager as it travels into deep space.
Which of the following best describes the history behind the current concept of dynamics?
Sir Issac Newton (1643–1727), using previous concepts advanced in the discourse of dynamics, refined and clarified concepts of inertia and motion that remain the prime ideas of modern dynamics.
Which of the following events best demonstrates a balanced force?
At summer camp, two tug-of-war teams pull a rope but are so evenly matched that neither side moves.
Which of the following statements about Newton’s law of inertia is not correct?
An object at rest will accelerate if balanced forces are applied to it.
Which of the following examples does not demonstrate the effect of friction on objects in motion?
The spacecraft Voyager traveling through deep space with constant velocity.
