Speed & Distance
Speed= ____ x ____________
Distance/time
An object is balanced when its net force equals...
Zero
The first law of motion states that an object at rest will___________, and an object in motion will______.
Stay at rest
Remain in motion
Work= _____ x ______
Work= force x distance
Thermal energy comes in three different forms. Name each form.
Conduction, Convection, Radiation
What tool would you use to measure your desk?
Ruler
The SI unit for force is ...
Newton
The second law of motion states that force = ________ x _______-
mass x acceleration
What is the unit for work?
Joule
Mechanical energy is the energy of motion. What are two types of mechanical waves?
Transverse and Longitudinal
Speed is ___________.
Velocity is a ______________.
Speed is scalar.
Velocity is a vector.
What are the four types of friction?
Rolling, sliding, fluid and static
The law of conservation of energy/matter states....
Energy can never be created or destroyed, just rearranged.
For work to be done, what has to happen?
A push, pull, or force has to be exerted.
If an object has a _________ specific heat, the object will heat up faster.
Lower
What is the most appropriate SI unit to express the speed of a runner in the first part of a 10 km race?
km/s
The SI unit of power is...
Watt
Galileo
The efficiency of a machine is always less than 100%, why?
Friction is always acting on it
The frequency of a wave is measured in _____.
Hertz
Suppose you increase your jogging speed from 8m to 10m in a period of 1 second. What is your acceleration?
2 m/s
Power= ________ / _______
Work/Change in Time
This scientist studied at Cambridge, created calculus, and created three laws of motion. Who was he?
Isaac Newton
The equation E=mc2 stands for what?
Energy = mass x the speed of light squared
Waves that are reflected _________.
Waves that are refracted ___________.
Waves that are diffracted ___________ around an obstacle.
Bounce, Bend, Bend around an obstacle