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science y8 > dice questions > Flashcards

dice questions Flashcards

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1
Q

if magnetic field lines are close together what does this mean?

A

the magnetic field is strong

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2
Q

how can friction be reduced?

A

•smoother surfaces
•lubrication
•make the objects more streamlined

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3
Q

how can an electromagnet be made stronger?

A

•increasing the amount of coils on the solenoid
•using a magnetic material for the core (like iron)
•increase the voltage

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4
Q

what is the scientific word for voltage?

A

potential difference

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5
Q

how can you find magnetic field lines?

A

•plotting compasses
•iron fillings

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6
Q

what is the unit of force?

A

newtons (N)

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7
Q

what is the equation for speed?

A

distance travelled divided by time taken

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8
Q

what is a solenoid?

A

a wire wound into a tight coil, part of an electromagnet

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9
Q

what is a contact force?

A

a force that needs to touch objects to be applied to them

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10
Q

what is a non-contact force?

A

a force that doesn’t need to touch the objects it is applied to

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11
Q

name 3 contact forces

A

•friction
•air resistance
•water resistance

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12
Q

name 3 non-contact forces

A

•gravity
•magnetic force
•electrostatic force

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13
Q

3 examples of magnetic materials

A

•iron
•nickel
•cobalt

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14
Q

what is the equation for distance?

A

time taken x speed

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15
Q

what is hookes law?

A

a law stating that the amount of force applied to a spring is proportional to the amount the spring stretches

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16
Q

how do you calculate the extension of a spring?

A

by subtracting the original length from the new length

17
Q

what are the benefits of using electromagnets

A

•strength control
•switching it on/off

18
Q

what is the equation for time?

A

distance travelled divided by speed

19
Q

what equipment measures current in a circuit?

A

an ammeter

20
Q

what is the independent variable?

A

the variable that is changed

21
Q

what is the dependent variable?

A

the variable that is measured

22
Q

what is the control variable?

A

the variable that is kept the same

23
Q

if you sit on a table what forces are acting on you?

A

gravity and the upthrust of the table

24
Q

what is current measured in?

A

amps

science y8 (3 decks)

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