Download Newton`s First Law KEY

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Newton’s First Law
1.
Define a force. What are the units for force?
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2.
What are some scientific discoveries related to Newton?
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3.
An elephant would have more inertia while zigzagging and would lose speed
applying force to change direction.
You are running around the room with a full beaker of water. When you stop suddenly,
what will happen to the water inside the beaker?
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9.
When a car is hit from behind, the passengers’ heads are at rest and will not
move with the car itself. Headrests cushion the head during the acceleration and
keep the head from snapping back.
If an elephant were chasing you, its enormous mass would be most threatening. But if
you zigzagged, its mass would be to your advantage. Why?
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8.
A cannonball would move through frictionless space at constant speed with 0 net
force.
Many automobile passengers have suffered neck injuries when struck by cars from
behind. How does Newton's law of inertia apply here? How do headrests help to guard
against this type of injury?
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7.
Inertia relates to all objects, both moving and at rest.
If you were in a spaceship and fired a cannonball into frictionless space, where no
unbalanced forces will act, how much force would have to be exerted on the ball to keep
it moving once it has left the spaceship?
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6.
Inertia is the measure of an object’s resistance to change. Mass has the biggest
impact upon inertia.
Does the law of inertia pertain to moving objects, objects at rest or both?
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5.
Newton is known for the 3 laws of motion, calculus, proving heliocentricity, and
gravitation.
Define inertia. What factor has the biggest impact upon inertia?
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4.
A force is anything with the ability to change motion. Force is measure in
Newtons (N).
The water in the beaker will splash forward because it is still moving when you
stop.
Two dogs are tugging on a toy. One dog pulls with a horizontal force of 15 N due east.
The other is pulling with a horizontal force of 15 N due west. What is the net force
acting on the toy?
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The net force is zero, because the dogs have balanced the force.