Newton's First Law
What is Newton's First Law?
An object in motion (or at rest) will tend to stay in motion (or at rest) until it is acted upon by an outside force.
What is Newton's Second Law?
When an object is acted upon by one or more outside forces, the total force is equal to the mass of the object times the resulting acceleration.
What is Newton's Third Law?
For every action, there is an equal and opposite reaction.
Who discovered the 3 Laws we have been learning about this unit?
Sir Isaac Newton
Why is Newton's First Law sometimes referred to as the Law of Inertia?
Because it describes inertia, which is an objects resistance to a change in its state of motion
What is the definition of force?
Force is a push or a pull exerted on an object in an effort to change that object's velocity.
What is the "action" referring to in Newton's third law?
A force
Is force a vector or a scalar quantity?
Vector quantity
What is inertia?
The tendency of an object to resist changes in its velocity.
What is the measurement used to describe force?
Newton
Different objects
What is friction?
A force that opposes motion, resulting from the contact of two surfaces.
A car is traveling down the road at 30 MPH. A truck, driven by a reckless driver, comes up from behind with a speed of 50 MPH. The truck slams into the back of the car. Will the car's passengers be flung forward or backward in their seats? Explain your answer.
Backward. Before the truck hits, the passengers in the car are traveling with the car at 30 MPH. When the truck comes up from behind and hits the car, it will push the car forward, accelerating the car. Thus, the car will begin traveling faster than 30 mph. The passengers, however, are still traveling at 30 MPH, so they will be flung backward in their seats until the backs of their seats apply enough force to accelerate them to the same velocity as the car.
What is static friction?
Friction that opposes the initiation of motion.
(1) When you fire a gun, it "kicks" back towards you. That "kick" is a result of which of Newton's laws?
(2) When you pull the trigger, you cause a _______ to take place in the chamber.
1. Newton's third Law of motion
2. chemical reaction
What is kinetic friction?
Using Newton's First Law, explain why Voyager 1 is still in space after 48 years and after running out of fuel years ago.
The engine and the gravity of the planets it passed by accelerated it to high speeds. Since very little friction exists in space, it will continue to travel at those high speeds, because it has no significant outside force acting on it to stop it.
kg x m
________
sec2
Using Newton's Third Law, explain how someone can travel upward against the pull of gravity when they are on a trampoline.
When you jump on a trampoline, you exert a force on it and cause the surface to bow. In response to the force exerted, the trampoline exerts a force on you and causes you to accelerate in a different direction. The forces exerted are equal. Thus, you can defy gravity.
What is the difference between mass and weight?
Mass is the amount of matter in an object, which stays constant regardless of location, while weight is the force of gravity on that mass, which changes depending on the gravitational pull.