Vocab
The property of an object that resists movement by a force (Newton's First Law)
Inertia
Geese flying south at 12 miles per hour
Velocity
A swimmer pushes water back with her arms, but her body moves forward
3rd Law
Work is measured in
Joules
An inclined plane wrapped into a spiral
Screw
a change in position or location
Movement
A car speeds up from 30 mph to 60 mph
Acceleration
An ice skater pushes harder with his leg muscles, he begins to move faster
2nd Law
Power is measured in
Watts
made of 2 inclined planes and used to push objects apart
Wedge
a push or pull that causes an object to move, stop, or chance direction
force
If a car travels 400m in 20 seconds how fast is it going?
20 m/s
What unit is used to measure Force?
Newton
Frank does 2400 J of work in climbing a set of stairs. If he does the work in 6 seconds, what is his power output?
400 Watts
Scissors, rake
lever
a force that slows or stops motion when objects rub together
friction
How much time will it take for a bug to travel 5 meters across the floor if it is traveling at 1 m/s?
5 seconds
What type of force needs to be applied to create motion?
Unbalanced force
How much work does an elephant do while moving a circus wagon 20 meters with a pulling force of 200 N?
4,000 J
bicycle, wagon
Wheel and axle
speed in a particular direction
velocity
If you shout into the Grand Canyon, your voice travels at the speed of sound (340 m/s) to the bottom of the canyon and back, and you hear an echo. How deep is the Grand Canyon at a spot where you can hear your echo 5.2 seconds after you shout?
1,768 meters
How much force is needed to accelerate a 25 kg bowling ball 2 m/s2
50 N
A teacher pushed a 98 newton desk across a floor for a distance of 5 meters. He exerted a horizontal force of 20 newtons for four seconds.
a. How much work was done?
b. What was his power?
A) 490 J
B) 122.5 Watts
uses wheels and a rope to raise, lower or move a load