Motion And Pressure Flashcards
What is the equation for speed?
Speed= distance traveled/time taken ( s)
What does the slope of a distance time graph show
The speed
When the moving object travels faster …….
The slope of the graph gets steeper
A curved distance time graph shows…….
The acceleration of an object
The vertical axis of a distance time graph shows
The distance
The horizontal slope of a distance time graph shows
The time
A distance time graph shows
How fast an object moves each second
When the moving object stops
The slope goes flat
When the moving object goes backwards
The slope goes down
What happens to gas molecules in a smaller volume
They collide more
What temperature is a gas when it has fewer and less energetic collisions
A cooler gas
What temperature is a gas with more collisions that are more energetic
A hot gas
What happens to a gas if the volume gets bigger
The pressure is smaller
Why is the air pressure smaller at the top of a mountain
There are fewer gas molecules
What happens to the pressure of a gas if the temperature gets hotter
The pressure gets bigger because there are more energetic collisions
What is another reason why the air pressure is smaller at the top of a mountain
Gravity has brought most of the air molecules down to sea level of ground level
Why does the can collapse ???🤔🤔🤔
The can collapses because the pressure inside the can is smaller and the density of the can is less m, this means that the pushing force is larger on the can and that force wins against the cans structure and the can implodes
What does incompressible mean
It means when the particles are touching and there is very little space between them
Why does the pressure increase as you go deeper in a lake or any other body of water
The pressure increases because the weight of the water is more as you go deeper
What is the force that acts against you as you go deeper under water
Upthrust
What is the pressure of the water on either side of you as you go deeper
The same
Why would a boat made of modelling clay float
It would float because there is more surface area for upthrust to act on
Why would a ball of modelling clay not float
It wouldnt float because it is more compact and therefore heavier and it has a small surface area and therefore less area for upthrust to act on
Why would a ping pong ball float
It would float because it is light and full of air and because it is light upthrust is greater than the weight of the ball
What is the equation for pressure
Pressure ( n/m^2 )= force ( n )/ area ( m^2 )
What does pressure measure
The force per unit of area
The more the force is …..
The greater the pressure
The greater the area over which the force is acting on…..
The smaller the pressure
Force is measured in
Newtons
What is pressure measured in
Pascals
Why are blunt scissors poor at cutting things
The larger the area, the smaller the pressure
Why can you push one end of the pin but not the other?
The larger end will have a low pressure because the surface area is greater but second has a smaller surface area so the pressure is greater
Why are caterpillar tracks good at driving over snow and mud
Caterpillar tracks spread the weight over a larger surface area, so the pressure on the ground is less
What are forces on a stationary object
Balanced
What is the name for the highest speed when falling
Terminal velocity
What is the turning effect of a force
A moment
How do you calculate a moment
Force x distance
What happens if the clockwise moments are equal to the anticlockwise moments?
The object is in equilibrium
What does the weight of an object act through
The centre of mass
In a balance beam how many input variables are there
2: mass and distance from centre
What is the outcome variable of the balance beam
Equilibrium
What is the relationship between mass and distance in the balance beam
As the mass increases the distance decreases and vice versa
What is the general rule for the relationship between mass and distances in the balance beam
Mass x distance on an anticlockwise side must equal m x d on clockwise side
