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Science > Forces and Speed > Flashcards

Forces and Speed Flashcards

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1
Q

air resistance

A

The force on an object moving through the air that causes it to slow down

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2
Q

balanced forces

A

Forces acting on an object that are the same size but act in opposite direction

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3
Q

compress

A

To squash into a smaller space

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4
Q

contact force

A

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

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5
Q

deform

A

To change shape

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6
Q

drag force

A

The force on an object moving through air or water that causes it to slow down

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7
Q

driving force

A

The force that is pushing or pulling something

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8
Q

elastic limit

A

the maximum extent to which a solid may be stretched without permanent deformation

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9
Q

electrostatic force

A

The force acting between two charged objects

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10
Q

equilibrium

A

When forces acting on an object are the same size but act in opposite directions

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11
Q

extension

A

The amount by which an object get longer when force is applied

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12
Q

field

A

The region where something feels a force

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13
Q

friction

A

The force that resists movement because of contact between surfaces

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14
Q

gravity

A

A non-contact force that acts between masses

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15
Q

Hooke’s law

A

The law that says that if you double the force, the extension will double

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16
Q

interaction pair

A

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

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17
Q

lubrication

A

A substance that reduces friction between surfaces when they rub together

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18
Q

magnetic force

A

The force between two magnets, or a magnet and a magnetic material

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19
Q

mass

A

The amount of matter something is made of

20
Q

newton meter

A

A piece of equipment used to measure force in newtons

21
Q

non-contact force

A

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

22
Q

reaction

A

The support force provided by a solid surface

23
Q

resistive forces

A

Any forces that act to slow down a moving object

24
Q

streamlined

A

Shaped to reduce resistance to motion from air or water

25
Q

tension

A

a stretching force

26
Q

unbalanced forces

A

Opposing forces on an object that are unequal

27
Q

water resistance

A

The force on an object moving through water that causes it to slow down

28
Q

weight

A

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

29
Q

independent variable (input variable)

A

what we change

30
Q

dependent variable (outcome variable)

A

what we measure

31
Q

controlled variable

A

what we keep the same

32
Q

What are the characteristics of a streamlined shape?

A

Rounded front, Slowly tampering tail, Smooth shape with no projections

33
Q

How can you reduce friction?

A

Lubrication, Streamlined

34
Q

Weight measures the _______

A

Effect gravity is having on an object

35
Q

Mass is the ________

A

Measurement of how much of something there is

36
Q

What is a vector quantity?

A

Something that has magnitude (size) and direction

37
Q

What is a scaler quantity?

A

Something that only has magnitude (size)

38
Q

What is the Earth’s gravitational field strength?

A

9.8 newtons (N) rounded up to 10N

39
Q

How do you calculate weight?

A

Weight (N) = Mass (kg) x Gravitational field strength (N/kg)

40
Q

How do you calculate density?

A

Density (g/cm3) = Mass (g) / Volume (cm3)

41
Q

How do you calculate speed?

A

Speed (mph) = Distance (miles) / Time (hours)

42
Q

lift

A

Force pushing upwards on an object flying in the air

43
Q

upthrust

A

Force pushing upwards on an object in a liquid

44
Q

thrust

A

A push caused by an engine

45
Q

push/pull force

A

A force exerted to move an object towards/away from another object

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