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Science > Motion And Pressure > Flashcards

Motion And Pressure Flashcards

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1
Q

What is the equation for speed?

A

Speed= distance traveled/time taken ( s)

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2
Q

What does the slope of a distance time graph show

A

The speed

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3
Q

When the moving object travels faster …….

A

The slope of the graph gets steeper

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4
Q

A curved distance time graph shows…….

A

The acceleration of an object

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5
Q

The vertical axis of a distance time graph shows

A

The distance

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6
Q

The horizontal slope of a distance time graph shows

A

The time

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7
Q

A distance time graph shows

A

How fast an object moves each second

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8
Q

When the moving object stops

A

The slope goes flat

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9
Q

When the moving object goes backwards

A

The slope goes down

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10
Q

What happens to gas molecules in a smaller volume

A

They collide more

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11
Q

What temperature is a gas when it has fewer and less energetic collisions

A

A cooler gas

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12
Q

What temperature is a gas with more collisions that are more energetic

A

A hot gas

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13
Q

What happens to a gas if the volume gets bigger

A

The pressure is smaller

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14
Q

Why is the air pressure smaller at the top of a mountain

A

There are fewer gas molecules

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15
Q

What happens to the pressure of a gas if the temperature gets hotter

A

The pressure gets bigger because there are more energetic collisions

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16
Q

What is another reason why the air pressure is smaller at the top of a mountain

A

Gravity has brought most of the air molecules down to sea level of ground level

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17
Q

Why does the can collapse ???🤔🤔🤔

A

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

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18
Q

What does incompressible mean

A

It means when the particles are touching and there is very little space between them

19
Q

Why does the pressure increase as you go deeper in a lake or any other body of water

A

The pressure increases because the weight of the water is more as you go deeper

20
Q

What is the force that acts against you as you go deeper under water

A

Upthrust

21
Q

What is the pressure of the water on either side of you as you go deeper

A

The same

22
Q

Why would a boat made of modelling clay float

A

It would float because there is more surface area for upthrust to act on

23
Q

Why would a ball of modelling clay not float

A

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

24
Q

Why would a ping pong ball float

A

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

25
Q

What is the equation for pressure

A

Pressure ( n/m^2 )= force ( n )/ area ( m^2 )

26
Q

What does pressure measure

A

The force per unit of area

27
Q

The more the force is …..

A

The greater the pressure

28
Q

The greater the area over which the force is acting on…..

A

The smaller the pressure

29
Q

Force is measured in

A

Newtons

30
Q

What is pressure measured in

A

Pascals

31
Q

Why are blunt scissors poor at cutting things

A

The larger the area, the smaller the pressure

32
Q

Why can you push one end of the pin but not the other?

A

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

33
Q

Why are caterpillar tracks good at driving over snow and mud

A

Caterpillar tracks spread the weight over a larger surface area, so the pressure on the ground is less

34
Q

What are forces on a stationary object

A

Balanced

35
Q

What is the name for the highest speed when falling

A

Terminal velocity

36
Q

What is the turning effect of a force

A

A moment

37
Q

How do you calculate a moment

A

Force x distance

38
Q

What happens if the clockwise moments are equal to the anticlockwise moments?

A

The object is in equilibrium

39
Q

What does the weight of an object act through

A

The centre of mass

40
Q

In a balance beam how many input variables are there

A

2: mass and distance from centre

41
Q

What is the outcome variable of the balance beam

A

Equilibrium

42
Q

What is the relationship between mass and distance in the balance beam

A

As the mass increases the distance decreases and vice versa

43
Q

What is the general rule for the relationship between mass and distances in the balance beam

A

Mass x distance on an anticlockwise side must equal m x d on clockwise side

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