Week 13: Why we believe that the laws of the universe are universal Flashcards
It occurs whenever an object curves down toward the ground because it has both a horizontal force and the downward force of gravity acting on it.
projectile motion
Examples of objects that have projectile motion include:
arrows and cannon balls
a measure of the change in velocity of a moving object. It measures the rate at which velocity changes
acceleration
a measure of the speed and direction of motion, so a change in velocity may reflect a change in speed, a change in direction, or both
velocity
Both velocity and acceleration are:
vectors
any measurement that has both size and direction
vector
acceleration is negative and called:
deceleration
states that an object at rest will remain at rest and an object in motion will stay in motion unless it is acted on by an unbalanced force
Newton’s first law of motion
often called the law of inertia because inertia is the tendency of an object to resist a change in its motion. If an object is already at rest, inertia will keep it at rest. If an object is already in motion, inertia will keep it moving.
Newton’s first law of motion
describes how force and mass affect acceleration. The law states that the acceleration of an object equals the net force acting on the object divided by the object’s mass.
Newton’s second law of motion
an inverse relationship
The relationship between mass and acceleration is different
when one variable increases, the other variable decreases
inverse relationship
states that the acceleration of an object equals the net force acting on the object divided by the object’s mass
Newton’s second law of motion
his law states that every action has an equal and opposite reaction. This means that forces always act in pairs
Newton’s third law of motion
equal and opposite, but they are not balanced forces because they act on different objects so they don’t cancel out
Action and reaction forces
