Chapter 9 Review Flashcards
The ability to do work
energy
the amount of matter in an object
mass
the ability to make something move
mechanical energy
the change in an object’s position
motion
a fixed unmoving object or location
reference point
determined by an object’s mass and velocity
momentum
the resistance to a change in motion
inertia
a push or pull that causes an object to change speed or direction
force
occurs whenever an object speeds up, slows down, or changes direction
acceleration
keeps an object from moving against other objects
friction
is this an example of acceleration, distance, speed, or velocity… Emily’s coach started timing Emily’s run. At 10 minutes Emily had run 1 mile and at 15 minutes she had run 2 miles.
Distance
is this an example of acceleration, distance, speed, or velocity… Emily usually runs 6.5 mi/hr
speed
is this an example of acceleration, distance, speed, or velocity… Connor increased his speed, passed the runner, and won the race
acceleration
is this an example of acceleration, distance, speed, or velocity… On the day of the race, Jax ran along the track toward the east at 7.5 mi/hr
velocity
is this an example of acceleration, distance, speed, or velocity… The runner at the front of the race suddenly stumbled over a piece of gravel. His speed slowed.
Acceleration
Force is measured in
Newtons
The spot where a lever turns
Fulcrum
The resistance force works against what?
the effort
What is a simple machine
A simple machine makes work easier by strengthening the force used to do the work or by changing the direction of the applied force
A slide is an example of what?
an inclined plane
A doorknob is an example of what?
wheel and axle
A block and tackle contains …
a block and tackle combines multiple fixed and moveable pulleys.
What unit is used to measure work?
joule
The decrease in effort that is needed to move an object
mechanical advantage
What is a bar that turns on a point called?
Lever
Which machine is actually an inclined plane would around a cylinder or cone?
screw
which machine consists of two inclined planes placed back to back
wedge
Which simple machine makes work easier by either changing the direction of the force or by reducing the amount of force needed to move an object?
pulley
Which Law of Motion is being used in the example: The rocket is launched, expelled gases downward to the ground, causing the rocket to move upward
third law of motion
Which Law of Motion is being used in the example: it took one student to pick up a box filled with feathers and two students to pick up the same-sized box filled with books
second law of motion
Which Law of Motion is being used in the example: You are ice-skating and hit a hidden rock in the ice. You fall when you hit the rock.
first law of motion
Who formulated the three laws of motion
Sir Isaac Newton
In what way does friction affect motion?
Friction is a force that keeps objects from moving against other objects. Friction works against inertia and helps us to walk.
What effect does gravity have on motion?
Gravity keeps an object from moving indefinitely in a straight line.
