Connections
Does work depend on how fast it is done?
No!
What was Watt’s claim to fame?
Steam Engine
H is the symbol for which element?
Hydrogen
For Every action...
...there is an equal and opposite reaction. (Newton's 3rd Law)
Determine the height of a bridge (in meters) if a dropped ball takes 5 seconds to get to the bottom. (Use formula h= ½ g t2)
122.5m
Why do falling objects fall at different speeds if the gravity is constant?
Air resistance
What are the different units of force?
Ft-lbs or Newtons
C is the symbol for which element
Carbon
An object in motion remains in motion...
...unless acted on by an outside force
If 1 Newton is equal to the force needed to accelerate 1kg at 1m/s2 What force would be needed to push a 100kg box 5 m/s2?
500N
Gravity between small objects is __________.
small
What is the value of the speed of light?
300 million m/sec
What is the symbol for Helium?
He
An object at rest remains at rest...
...unless acted on by an outside force
Use equation W=FD to determine how much work is done when a box weighing 200lbs is pushed 3 feet.
600FT-LBS
Negative acceleration means that an object is doing what?
Slowing down
What is the metric unit for Work?
Newton-meter (or Joules)
What is the symbol for Iron?
Fe
Force is equal to:
Mass x Acceleration
Who has more momentum, Running back Andre Porter (300lbs going 5mph) or Wide Receiver Branson Banks (150lbs going 10mph)
They have the same mementum!
Give an example of an object used to increase friction
Cleats, chalk
What two variables are needed to determine density?
Mass and Volume
What is the symbol for Copper?
Cu
According to Newton's 2nd Law, if you increase the force on an object you increase what?
Acceleration
Calculate the speed of a racket ball that travels 50m in 2 seconds?
25m/sec