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Science > Forces Revision > Flashcards

Forces Revision Flashcards

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1
Q

What three forces slow objects down?

A

Friction , air resistance and water resistance act between moving surfaces to slow objects

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2
Q

What do most forces require?

A

Direct contact

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3
Q

What does friction do to objects?

A

It grips them

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4
Q

Why do objects stop when being pushed along a surface?

A

Because the rough surfaces can no longer move past each other.

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5
Q

The rougher the surface….

A

The more the friction

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6
Q

Explain contact forces

A

They are forces that act when the objects are in contact

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7
Q

Explain noncontact forces

A

They are forces that act when the objects are not in contact(magnetism)

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8
Q

What is a drag force?

A

A Force that slows down an object moving through fluid, such as air or waIter is called a drag force.
Eg(water resistance and air resistance)

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9
Q

Describe the particles behind the drag force

A

In air the particles are more widely spaced so the solid moves through easier ,compared to in a liquid where the particles are touching ,the solid has less space to move through the water particles,which slows the object down.
The opposing force (in this case travelling backward is drag force )

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10
Q

What affects motion?

A

Drag forces and friction affect motion

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11
Q

Laura measures the speed of a ping-pong ball when she drops it from different heights using a motion sensor .She notices that the speed of the ping-pong ball is roughly the same at the end of it’s fall for every drop higher than 260 cm explain why the final speed of the ball does not change after 260 cm.

A

As the ball falls the air resistance increases,for heights above 260 cm both of the opposite forces become balanced so the ball moves at a constant speed.

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12
Q

What does it mean when the resultant force is zero?

A

it means that the object is either in equilibrium or moves at a constant speed

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13
Q

How can you reduce drag forces and friction?

A

You can reduce drag friction by …

  1. )making shapes more streamlined
  2. )decreases the surface area
  3. )lubricating objects
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14
Q

What is it called when forces change the shape of objects?

A

Deformation

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15
Q

What does it cause when forces squash an object?

A

Compression

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16
Q

What does it cause when forces stretch an object?

A

Tension

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17
Q

What happens to the bonds when you squash a solid object or exert a force on an object?

A

The bonds are compressed

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18
Q

What are bonds?

A

Bonds are particles joined strongly together

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19
Q

What is a support force from a chair or the floor called?

A

A reaction Force

20
Q

What is a reaction Force?

A

A reaction force is a force acting in the opposite direction.
Eg(air resistance,and gravity for ,rock falling)

21
Q

The amount that things like cords and springs stretch is called the….

A

Extension

22
Q

What can Forces can make objects change ?

A

the shape speed or their direction when they are in motion they can also make objects change shape.

23
Q

What can stretching forces do?how does this effect the object?

A

They can change the shapes .it makes the object longer and thinner .

24
Q

What do compression forces do?

A

They squash objects,making them smaller.

25
Q

What is a plastic material?

A

It is a materiel that changes shape PERMANENTLY,when they are deformed from an external force.
(Eg:play dough )

26
Q

What is an elastic material?

A

It is a material that returns to its original shape ,once the external force is re,over.
(Eg:elastic band)

27
Q

Hooke’s Law is…

A

That the force is extension is directly proportional to the force applied .

28
Q

Hooke’s law’s equation is…

A

F=kx

29
Q

F=?
k=?
x=?

A

F=force (N)
K= spring constant (n/m)
X=the extension (m)

30
Q

What is the spring constant ?

A

It is hbmnviyfkhvmbvkhotofindout@school

31
Q

The ? The area the ? The pressure

A

The smaller the area ,the more the higher the pressure

32
Q

The force spread over a ? Area produces a ? Pressure

A

The forces spread over a larger area produces a lower pressure

33
Q

What is the equation for calculating pressure ?

A

Force=pressure x area (measured in n/square meter or centimetre)

34
Q

What are the 4 steps for calculating equations?

A

1.) write out the formula
2.)substitute in the values
3.)calculate the answer
4.)add unit
FOLLOW ALL STEPS IN ORDER!

35
Q

KEY POINT:

A

When asked to explain results ,think about the particles.

36
Q

G=…

A

Gravitational force field

10g on earth

37
Q

What is a gravitational force field?(measured in g/10g on earth)

A

Where mass experiences a force

38
Q

Weight =

A

Mass x g(gravitational force field )
Eg:
m=10kg
W=100N

39
Q

Weight is …

A

A FORCE measured in Newton’s

40
Q

Mass is …

A

How much stuff something is made of (measured in grams or kilograms)

41
Q

The ? Of liquids is ?Around the ? Of a container

A

The pressure of liquid is all around the walls of the container

42
Q

Pressure actins in…

A

All directions

43
Q

What does pressure increase with?

A

It increases with depth

44
Q

Why do boats sink?

A
  1. )(The boat is less dense than the water )
  2. )many of the particles contain air
  3. )up thrust
45
Q

Higher….(particles)

A

Less particles

Science (6 decks)

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