Measure the Motion
The Units that speed is measured in is
distance/time
For every action there is
an equal and opposite reaction.
What is impulse?
a change in momentum
What is the Unit for Work?
Joules(J)
What is an insulator?
An object that does not give up its electrons easily.
The information needed for describing velocity is
distance/time and direction
Which is the hardest to slow down a Barbie jeep, a honda accord(car), or a school bus.
The school bus
If the momentum of something changes that means that =
that object's mass or velocity changed
An object that has kinetic energy must be
Moving
What does the word static mean?
Not moving.
It can be important to know the velocity of an object, not just its speed because
velocity also tells direction
forces that cancel out each other are
balanced forces
Andrew weighs 65 kg and is late to class. He runs at 9 m/s. What is his momentum?
585 kg*m/s
If you double the height of an object, what happens to its gravitational potential energy?
Gravitational potential doubles as well
What is the difference between static and current electricity?
Current electricity moves along a pathway.
You can calculate an average ______ if you know both the total distance and total time of a trip.
speed
Which law explains that a pencil on the desk will not move until a student picks it up?
Newton's First Law
m1v1 + m2v2 = (m1+m2)vf
This is the law of conservation of momentum for a collision where the objects do what?
Stick Together
A 5 kg object is held 5 m above the ground. What is its gravitational potential energy?
250 J
When would static electricity "jump?"
When it is discharging onto another object
A car traveling at 25 m/s speeds up to 40 m/s over a period of 15 seconds. The average acceleration of the car is
1m/s2
A baseball hit with a wooden bat goes farther than a baseball hit with a plastic bat. This is an example of which law of motion?
Newton's Second Law.
A bullet train with a mass of 48,000 kg slows down from 130 m/s to 50 m/s. What is the impulse exerted on the train by the brakes?
-3,840,000 kgm/s
Why is potential energy called POTENTIAL energy?
Potential energy is stored energy.
Explain why you need current electricity, instead of static electricity, to power a lightbulb.
Electricity needs to be able to flow through a circuit in order to power a lightbulb.