Chapters 2 & 3
What is gravity?
9.8 M/sec2
Do you weigh more on the Earth or the Moon?
Earth
Define Work
force x distance
Is copper a good conductor or insulator of electricity?
conductor
How many poles does a magnet have?
2
What would a graph of constant speed look like?
a horizontal line
What is the unit for Force?
Newtons
Why do we use machines?
They make work easier
What does a fues do?
Prevents overheating
The arrow on a compass points to ______________
magnetic north
Which has more momentum? A tractor trailer or a motorcycle?
Tractor trailer
If a book is laying on the table, what forces are acting on it?
Gravity and Normal Force
What is mechanical advantage?
Describes the effectiveness of a machine
ELectrons move from _________ to _________ in a circuit
negative to positive
A magnetic field is strongest __________________.
at the ends of the magnet
If a ball is rolling 5 m/s for 5 seconds, how far will it roll?
25 m/s2
What is the difference between mass and weight?
Weight is mass x gravity
A ramp is an example of which type of simple machine?
a ramp
What is the formula for Ohm's Law?
V = I x R
The more you wrap a wire around an electromagnet, the _____________ it becomes
stronger
What is the difference between speed and velocity?
velocity includes direction
What does Newton's 1st Law of Motion state?
An object at rest stays at rest
An object in motion stays in motion
How do you calculate the mechanical advantage of a pulley?
You count all the ropes except the end rope if it is pointing down.
What is the main advantage to use a parallel circuit?
A parallel circuit provides multiple independent branches, allowing the rest of the system to function if one part fails.
What is an electromagnet?
a type of temporary magnet created by passing an electric current through a coil of wire