2 1) Define: Density: Mass: The amount of matter in an object Weight: The gravitational force exerted on an object.Volume: The amount of space taken up by an object.Density: Mass per unit volumeBuoyant force: An upward force on an object in a fluid exerted by another fluid.Density:Which one is more dense?
3 2) A solid rubber stopper has a mass of 33. 0 grams and a volume of 30 2) A solid rubber stopper has a mass of 33.0 grams and a volume of 30.0 cm3. What is the density of rubber?d=m/vd= 33.0 g/30.0 cm3d= 1.1 g/cm3
4 3) A larger solid rubber stopper has a mass of 49 3) A larger solid rubber stopper has a mass of 49.5 grams and a volume of 45.0 cm3. Calculate the density. Did it change? Why?The density is still 1.1 g/cm3Why??Density does not change with the size of the sample.As long as you are measuring the same substance, the density will always be the same.
5 4) If the mass of an object is 5g and it is 2cm wide, 10 cm tall, and 2cm long, what is its density? d=m/vv=lxwxhd=5g/40cm3V=40 cm3d=0.125 g/cm3
6 5) What are the units used for density? 1 g/cm3 = 1 g/mL1000 kg/m3 = 1000 kg/L
7 6) List the steps needed to find the volume of a toy car. Record volume of waterPlace object in water and record combined volume.Subtract the starting volume from the ending volume to find out how much water was displaced.The amount of displaced water is the volume of the toy car.
8 7) Do Buoyant forces refer to the weight of an object or the mass of an object? Explain The weight, because buoyant forces are affected by gravity and weight is the gravitational force on a object.Since weight and gravity are closely related, and the only vertical forces at work are buoyancy and gravity, weight is what matters.
9 8) Why do boats float? Reflect on your boat lab. Boats can float only if their volume is increased enough to displace a greater amount of water than it would if it were crumpled in a ball.
10 9) Explain Archimedes’ Principle in your own words. The buoyant force on an object is equal to the weight of the fluid the object displaces.Pulling cards…
11 10) Why is Archimedes’ Principle useful? You tell me!(Pulling cards…)Just to name a few:Helps us find volume of things we don’t have a formula for.Helps us understand how fish, submarines, and scuba divers can control their depth.Helps us understand how boats float.