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# Newton's first law

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questions related to newtons first law of motion
• The scientist to first introduce the concept of inertia by thinking about friction was
Galileo
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• A sheet of paper can be withdrawn from under a container of milk without toppling it if the paper is jerked quickly. This best demonstrates that
the milk carton has inertia.
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• An object in mechanical equilibrium is an object
that can be at rest or moving at a constant speed
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• The force of friction on a sliding object is 10 N. The applied force needed to maintain a constant velocity is
10 N
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• A package falls off a truck that is moving at 30 m/s. Neglecting air resistance, the horizontal speed of the package just before it hits the ground is
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• If your automobile runs out of fuel while you are driving, the engine stops but you do not come to an abrupt stop. The concept that most explains why is
Inertia
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• According to Newton's law of inertia, a railroad train in motion should continue going forever even if its engine is turned off. We never observe this because railroad trains
always have forces that oppose their motion.
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• Whirl a rock at the end of a string and it follows a circular path. If the string breaks, the tendency of the rock is to
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• When a rocket ship accelerating in outer space runs out of fuel, it
no longer accelerates.
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• If no external forces are acting on a moving object, it will
continue moving at the same velocity.
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• Your inertia can be measured relative to another person by looking at their
mass
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• If Joe has a mass of 100 kg, and Betty has a mass of 50 kg, who has more Inertia?
Joe
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• If I fling a rock into space, beyond the gravity of the earth, it will stop...
when it hits something to provide a force
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• Who made the three laws of motion?
Newton
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• Who dropped balls down the tower of Pisa and down waxed bowls?
Galileo
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• Who was born last, Galileo or Newton.
Newton
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• If I want snow off my boots, I should do what?
stomp them on the ground
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• If a feather and a rock were rolling down the hill, which has more inertia?
rock
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• If I have a mass of 50 KG, what is my weight?
500 Newtons
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• The force of friction has 2 types, static and ...
Kinetic
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• Which is greater, static or kinetic friction
static
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• When the Net force = 0 , the situation is called this
equilibrum
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• When you are in equilibrium, you can be either at rest or
constant speed
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• What are the magnitudes of the minimum and maximum resultants of a 4N and a 6 N force?
2N and . 10 N
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• If I push on a book up that is at rest in my hand, then the book...
pushes down with the same force
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• The name of a "pulling force" due to a wire, rope or string, etc... is called...
Tension
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• The name of a force that opposes motion is
Friction
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• Does it take more force to start an object or keep it going due to friction?
Start it (static friction > kinetic friction)
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• The Force pulling me down an inclined plane is simply its FULL weight. (true or false)
false...it's the component of weight parallel to the plane.
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• The unit of mass is the Newton
false....kg
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• If I am a projectile, then I am only under the influence of this force...
Gravitational
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