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2 exams 2023 > science > Flashcards

science Flashcards

1
Q

what is a force

A

a push or a pull when two objects interact

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2
Q

what is an unbalanced force

A

a push or pull when two objects interact, if unbalanced can cause a change in motion

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3
Q

what is an example of push

A

standing on a scale

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4
Q

what is an example of pull

A

using a spring ballance

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5
Q

what is calibrate

A

to check accuracy

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6
Q

what do you measure forces in and why?

A

newtons because Issac newton found the force of an apple falling

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7
Q

what is a balanced force

A

when the next force is the same

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8
Q

what is terminal velocity

A

when you have reached your maximun speed

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9
Q

what is a non contact force

A

gravity, magnetism, electrostatic

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10
Q

what is a contact force

A

friction, buoyancy and air resistance

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11
Q

what is a net force

A

the combination of all the forces acting on a object. e.g 1 person cant lift a piano, but multiple can because they are added more force

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12
Q

what is friction

A

the force that resits contact. slows down moving objects

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13
Q

what is the definition of density

A

how much mass is in a given volume

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14
Q

what is buoyancy

A

the upward force to keep something from sinking

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15
Q

what is surface tension

A

cohesion at the surface of a liquid. A skin at the top of a liquid

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16
Q

what is cohesion

A

molecules that are attracted to each other

17
Q

what is gravity

A

attraction between 2 masses. pulle’s objects towards the centre of the earth

18
Q

what is tension

A

transmitted through a rope, string or cable when pulled at both ends

19
Q

what is applied force

A

a push, pull or twist that you apply

20
Q

what is newtons 1st law of motion

A

an object remains at motion or rest unless acted on by an unbalanced force

21
Q

what is newtons 2nd law of motion

A

when a net force acts on an object, the object accelerates

22
Q

what is mass

A

the amount of matter in something and measured in gs or kgs

23
Q

what is weight

A

mass x gravity and measured in newtons

24
Q
A

2 exams 2023 (3 decks)

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