Vocab
A force that opposes the motion of one object moving past another is
friction
A pull or push that acts on an abject is called a
force
Increasing mass _________ acceleration
decreases
When a firefighter turns on his hose and is knocked backwards what is the action?
The force from the water in the hose
Newton's first law is also called what?
The law of inertia
When all of the forces on an object cancel on another out, the forces are said to be
balanced forces
The speed of a moving object taken together with its direction of travel gives the ________ of an object
velocity
Increasing force ___________ acceleration
increases
When one object applies a force to a second, we call this force the
action
Who published a complete description of the concept of inertia?
Sir Isaac Newton
The force of gravity on any object is called its
weight
An object at ______ will stay at ________ and an object in motion will stay in motion until an unbalanced force acts upon it.
A change in velocity is called
acceleration
For every action, there is an equal but _________ reaction
opposite
Gravity is a (force/weight/speed)
How fast an object is changing in its position with time at any moment is its
speed
What are two ways that an object's velocity can change
A change in speed or direction
True or False: It takes more force to throw a bowling ball than a tennis ball
True
The force the second object returns to the first is called the _________
reaction
Air offers __________ to the motion of objects through it
resistance
The tendency of an object to resist a change in its state of motion is called the object's
inertia
A mass accelerates because ______
An unbalanced force acts on it
If you use the same force to push a truck and push a car, the car will have ______ acceleration than the truck, because the car has _____ mass.
more, less
When air is released out of a balloon, the balloon flies up. Which is the reaction?
The balloon flying up.
Forces are measured in what?
Newtons