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100
A ____________________ is a device that makes work easier to do.
machine
100
The ____________________ of a moving object describes its speed and direction
velocity
100
Oppositely charged objects ______________ each other
Attract
100
What is force?
A push or pull on an object
100
What is the equation for work?
Work=distance x force
200
Newton’s __________________ law of motion says it is impossible to have one force without an equal and opposite force.
Third law
200
_____________________ acts to slow an object down or prevent it from moving.
friction
200
What objects have a steady or constant motion?
sun, earth, planets
200
When is work done?
Work is done when a force MOVES an object
200
What is power?
Power is the rate at which work is done.
300
________________________ is the rate at which velocity changes over time.
acceleration
300
When we practiced keeping objects at rest and in motion, we were practicing the ______________ law of motion.
first law
300
What is the formula to calculate speed?
Average Speed=Distance /Time
300
Give me two examples of a simple machine.
pulley, leaver,incline plane, wheel and axle
300
Give me two examples of a complex machine
go cart, sailing ship, cranes
400
An object resists a change in motion because of _______________________.
inertia
400
Gravity is a ___________________ that pulls objects toward the center of the Earth
force
400
What can affect the amount of friction on an object?
shape, speed, texture
400
How are simple and complex machines different?
The are different because complex machines have multiple simple machines
400
What is equilibrium?
Equilibrium is when all the forces acting on an object balance each other.
500
______________________ is done when force moves an object
Work
500
Newton’s third law of motion is also known as the
action-reaction law
500
Automobiles and trains would be an example of what kind of motion?
variable
500
How are simple and complex machines similar?
Both are used to make work easier to do. Both are machines, which are devices that change the direction or force needed to do work.
500
What is Newton's second law?
It is about acceleration, mass, and net force are connected. Force=Mass x Acceleration
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