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24 Cards in this Set
- Front
- Back
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What is the amount of space occupied by an object?
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volume
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What is mass?
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the amount of matter in an object
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What is the force of attraction between 2 objects?
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Gravity
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What is the upward force exerted by a fluid
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Buoyancy
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What is the effect of gravity on mass?
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weight
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What is the "pushing away" of a fluid by an object?
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Displacement
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What is a fluid?
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A gas or a liquid
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What makes lead denser than aluminum?
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Lead has more atoms than aluminum. (there are more lead atoms than aluminum atoms)
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How can you change an objects mass?
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Add or take away from the object (ex. clay)
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How can you change an objects weight withoutchanging its mass?
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Change the gravity that is pushing down on the object. (Ex. take an object from earth to space)
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How can you change the volume of a glob of clay without changing the mass?
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Change the objects shape (EX glob of clay.. ball to a boat)
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If the density of salt water is 1.2, what is the density of an egg? How do you know?
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The density of an egg is about 1.1
Eggs sink in normal water (which has a density of 1) so the density has to be higher than one. Eggs float in salt water so the density has to be less than 1.2. More than One and less than 1.2 is about 1.1 |
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What causes the density of water to change when it freezes?
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The water molecules spread apart as it freezes (water expands when frozen) which increases its volume whcih amkes the density decrease
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The buoyant force exerted on a submerged object is 350 g. THe gravitational force acting on it is 650. What is the volume of the object? What is the density of the object?
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The volume of the object is 350 (Buoyant force is equal to volume)
The density is 1.8 g/cm3 |
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A block is 7cm x 8cm x 2cm and has a mass of 67 grams. What is the volume occupied by the object
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V=length x width x height
=7 x 8 x 2 =112 The volume of the object is 112 g/cm3 |
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A block is 7cm x 8cm x 2cm and has a mass of 67 grams. What is the density?
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V= length times width times height= 112
D= m/v = 67/112 = 0.6 m=67 v=112 DENSITY IS EQUAL TO 0.6 |
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A block is 7cm x 8cm x 2cm and has a mass of 67 grams.
The volume is 112 g/cm3 THe mass is 67 grams. How much additional weight (to the max) can be placesd on it without causing it to sink? |
45g. EXPLANATION: ok so, We need to make the density equal to exactly one because thats the max we can go to without causing it to sink. So right now the volume is 112, but we're talking about weight so we dont want to mess with that. We want to add to the mass. And how much extra grams of mass do we need to get that 67 to 112 so when you divide m/v you get 1 exactly. 112-67 is 45. Therefore, the answer is 45
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A 2cm x 2cm x 2cm metal block has a mass of 80 grams.
What volume of water does it displace when it is completely submerged? |
8 ml of water. The volume of the block is 2x2x2 = 8. an object displaces its volume in water.
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A 2cm x 2cm x 2cm metal block has a mass of 80 grams.
A volume of water displaces 8 ml of water. What is the weight of the water it displaces? |
1 ml= 1 gram. 8ml of water= 8 grams.
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A 2cm x 2cm x 2cm metal block has a mass of 80 grams.
The buoyant force is 8 (8 is the amount of water that the object displaces. If the block is hung from a spring scale and then submerged what will the spring scale read? |
so before it was put in the water, the spring scale would read 80 g. BUT the buoyant for ce is 8, which is an upward force so it would push the object up and cause there to 8grams less of gravity pressing down on it. so that means u have to take the original weight (80) minus the buoyant force (8). 80 - 8 = 72. The spring scale would read 72 grams.
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What happens to density if mass increases
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If mass increases, density increases, EX mass=2 volume=2 Density= 1
------------ mass=4 volume=2 Density=2. It increases when i add more mass |
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WEhat happens to density is volume increases?
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If volume increases, Density decreases. EX mass=6
volume=2 Density=4 ----- mass=6 volume=3 Density=2 |
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WhaT happens to buoyancy if volume increases?
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If volume increases, buoyancy increases. Buoyancy is equal to the volume of the object soo.. if the volume of the object increases so will the buoyancy
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What happens to buoyancy if mass decreases?
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Nothing.. Buoyancy is related to volume not mass. THe amount of space an object takes up is volume and buoyancy is the amount of water displaced 9the more the volume to more space it takes up and the more water is displaced because the object takes up the waters "area" and it has to "relocate" to a different place
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