Newton's Laws of Motion
What is Newton's first law of motion?????
An object at rest remains at rest, and an object in motion remains in motion at constant speed and in a straight line unless acted on by an unbalanced force.
What are two examples of objects at rest?
A chair on the floor and a golf ball balanced on a tee. Etc.
What unbalanced force acts to stop a desk that is sliding across a floor?
The friction between the desk and the floor.
Why do astronauts on the moon bounce when they walk?
Because there is less gravity on the moon.
If momentum is conserved, what happens to velocity when mass changes?
Velocity Changes
What is Newton's second law of motion?????
The acceleration of an object depends on the mass of the object and the amount of force applied.
What is the tendency of an object to resist being moved or, if the object is moving, to resist a change in speed or direction until an outside force acts on the object?
Inertia
Why is friction greater between surfaces that are rough?
It is because they are covered in microscopic hills and valleys.
What is gravity??
The force of attraction between two objects that is due to their masses.
How would velocity be show on a graph??
It would be shown on a graph of velocity VS time.
What is Newton's third law of motion???
Whenever on object exerts a force on a second object, the second object exerts an equal and opposite force on the first.
Why is an apple easier to accelerate than a watermelon?
The apple has less mass than the watermelon.
What is one way you use kinetic friction???
You use kinetic friction to write with a pencil or use the brakes on your car. Etc.
What Italian scientist argued that the mass of an object does not affect the time the object takes to fall to the ground?
Galileo Galilei
What is the definition of velocity?
The speed of an object and it's direction.
Which of Newton's laws of motion describes the motion of an object that has a net force of 0?
Newton's first law of motion.
What is the definition of motion??
An object's change in position relative to a reference point.
What are two types of friction??
1.Kinetic friction
2. static friction
Motion parallel to the ground is called?
Horizontal Motion
What is the difference between velocity an speed?
Velocity is speed and direction and speed is distance divided by time.
In 1686, what did Sir Issac Newton explain with his three laws if motion?
In 1686, Sir Issac Newton explained this relationship between force and the motion of an object with his three laws of motion.
On what two factors does acceleration depend?
force and mass
What is one way to reduce friction???
You can reduce friction by using lubricants.
Everything on Earth is pulled downward to the center by??
Gravity
How would you calculate the resultant velocity of two velocities in the same direction?
If they go in the same direction you would add them together.