Science physics 1-20 questions recitation

• Density = mass / volume
• Acceleration = change in velocity / time taken
• Force = mass × acceleration
• Momentum = mass × velocity
• What is gravity? - The force that exist between any two objects with mass
• Define pivot - The fixed point about which a lever turns
• Define clockwise - Turning in the same direction as the hands on a clock
• Pressure = force / area
• Power = work done / time taken
• Define atom - The smallest part of an element that can exist
• What is melting point? - The temperature as which a solid melts to become a liquid
• What is thermal conduction? - The transfer of thermal energy by the vibration of molecules
• What is convection current? - The transfer of thermal energy by the motion of a fluid
• What is compression? - A region of a sound wave where the particles are pushed together
• Define amplitude - The greatest height or depth of a wave from its undisturbed position
• Define frequency - The number of complete vibrations or waves per unit time
• Define hertz - The unit of frequency, 1 Hz = 1 wave per second
• Work done = force × distance
• Weight = mass × acceleration