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8 science > forces and presure > Flashcards

forces and presure Flashcards

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1
Q

Contact force

A

A force that acts when an object is in contact with a surface, air, or water.

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2
Q

Friction

A

Force resisting movement because of contact between surfaces.

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3
Q

Air resistance

A

The force of an object moving through air causing it to slow down.

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4
Q

Gravity

A

A non-contact force acts between two masses.

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5
Q

Non-contact force

A

A magnetic, electrostatic, or gravitational force that acts between objects not in contact.

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6
Q

Interaction pairs

A

When two objects interact there is a force on each one that is the same size but in opposing directions.

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7
Q

Newtons

A

The unit of force, symbol N.

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8
Q

Deforms

A

When an object changes shape.

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9
Q

Compress

A

To squash an object into a small space.

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10
Q

Tension

A

A stretching force.

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11
Q

Weight

A

The force of the Earth on an object due to its mass.

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12
Q

Mass

A

Amount of stuff a thing is made of.

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13
Q

Balanced

A

Forces acting on object that are equal and in opposite directions.

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14
Q

Unbalanced

A

Opposing forces on an object that are unequal.

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15
Q

what is meant by forces always come in pairs

A

it means that no matter what forces always have an opotion but they may not always be equel for example thrust and frict

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16
Q

Atmosphere

A

The layers of gases that surround the Earth. The important gases in the atmosphere are nitrogen, oxygen and carbon dioxide.

17
Q

Atmospheric pressure

A

The weight of air resting on the Earth’s surface.

18
Q

Fluid

A

A substance that can flow, such as a liquid or a gas

19
Q

Normal

A

Acting at an angle of 90° to a surface or boundary.

20
Q

Pascal

A

Unit of pressure. Pascal (Pa), eg normal atmospheric pressure is 1.01x105 Pa.

21
Q

Pressure

A

Force exerted over an area. The greater the pressure, the greater the force exerted over the same area.

22
Q

surface area

A

The total area of an object, for example the area of a skydiver’s body facing the air as they fall, or the area of a car tyre that touches the road.

23
Q

upthrust

A

Upwards force exerted by a liquid or gas on an object floating in it.

24
Q

Pressure in gases

A

Gas pressure (air pressure) is when the air molecules collide into each other. Lots of collisions make a high gas pressure because there is a big force over a small area.

25
Q

Pressure in liquids

A

Liquids are incompressible. This is because the particles are very close together and touching each other, so there is very little space between them. The water molecules are pushing on each other and on surfaces, and this liquid pressure acts in all directions.

26
Q

Pressure on solids

A

When you stand on any surface you exert a force on it because of your weight. Your weight is spread out over the area of your foot. You are exerting a pressure on the ground.

27
Q

Turning forces

A

Whenever you open a door you are using a turning force. A turning force acts in a certain distance from a pivot. The turning effect of a force is called a moment. The moment depends on the force being applied and how far it is from the pivot. Moment equals force multiplied by perpendicular distance from the pivot.

28
Q

force

A

a push pull or twist that explains the way things move

29
Q

mass and weight

A

Mass and weight are two different quantities. Mass is the amount of matter in an object and weight is the force experienced due to gravity. The unit of mass is kg and the unit of force is Newton. The unit of gravitational field strength ‘g’ is N/kg. Mass is always the same anywhere in the Universe but weight changes as ‘g’ changes.

30
Q

how do things float

A

Liquids pass on any pressure applied to them. It is liquid pressure that produces upthrust, the force that keeps things afloat. If you push a balloon into a bucket of water you can feel the water pushing back. Upthrust acts on any object that is floating, or is submerged in a liquid.

31
Q

what forces do magnets exert

A

magnetic forces without them touching

32
Q

what is rubbing a balloon and picking up pieces of paper an example of

A

of electro static force

33
Q

what is a field

A

the region around an object that experiences a force

34
Q

what is gravitational field

A

where things with mass experience gravitational force

35
Q

do forces get stronger or weaker the further away from the field

A

weaker

8 science (15 decks)

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