Motion and Forces
Define speed
rate of motion.
What is the formula for work?
W = F x d
What 2 factors affect KE?
mass and velocity
What 3 ways can neutral objects become statically charged?
conduction, induction, friction
define hypothesis
a possible answer to a question
Describe the difference between balanced and unbalanced forces
Balanced force: does not result in a change to an object’s motion ex: a paper sitting at rest on your desk
Unbalanced force: causes change to an object’s motion
What is the SI unit for power?
Watts (W)
What is the law of conservation of energy?
How is a fuse and circuit breaker similar and different?
Both safety features; detect electricity flowing through circuit; fuse is one time use
What is the difference between an independent variable and dependent variable? Give an example of each.
IV - you change
DV - change based upon IV
A plane flying north went 2000 meters in 2 seconds. What is the plane's velocity?
1000 m/s^2
What are the 6 simple machines?
lever
wheel and axle
wedge
screw
inclined plane
pulley
Define chemical energy
the energy stored within the bonds of molecules
Define electrochemical cell and give an example
device that converts chemical energy into electrical energy
Define a control
everything you want to stay the same in an experiment
Define terminal velocity
air resistance = force of gravity
max speed object can fall
What is an example of a 3rd class lever?
broom, baseball bat, etc.
What are the 3 ways heat can be transferred? Give an example of each.
convection, conduction, radiation
What 4 factors affect the amount of resistance a wire has?
material
length
diameter
temperature
Give examples of qualitative observations and quantitative observations.
qualitative - description
quantitative - numerical value
What is newtons 3rd law of motion?
If one object exerts a force on another object, then the second object exerts a force of equal strength in the opposite direction on the first object. ex:When you push against wall, the wall pushes back
How much work is required to life a 25 N object 5 m high?
100 J
Give an example of a chemical to mechanical energy transformation
battery powered fan
In a parallel circuit, what happens to the other bulbs if one bulb is removed?
the others will continue to work
In a test of the importance of eating breakfast on learning, college students were either given a free breakfast in the morning, or were prevented from eating breakfast. At the end of the semester, students’ GPAs were recorded.
IV - breakfast
DV - GPA