quick quiz_y3_forces and magnets

7/25/2019 Quick Quiz_Y3_Forces and Magnets

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Name: ___________________________________ Date:____________

Q1. Magnets

Vicky has a magnet in her hand.

There are some objects in the box.

Vicky is going to find out which objects are attracted by her magnet.

Compare the table of results by putting ONEtick so show the correct result for each object.

One has been done for you.

is attached is not attached

wooden pencil

steel safety pin

plastic bead

cardboard box

copper wire

2 marks

Q2. Magnetic toy

Science Quick Quiz

Year 3 Forces and Magnets


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(a !am has a toy made of magnets and balls.

"e tries to put different magnetstogether.

#rite N ($orth or S (!outh on each end of each magnet below to explain !am%sobser&ations. !ome ha&e been done for you.

Sams observations

The ends of these magnetspush away from each other.

The ends of these magnets

pull together.

' mark

(b The magnets attract the balls. !am makes a tower using the magnets and the balls."e wants to test how strong the tower is."e puts a ' g mass on the tower."e adds masses until the tower falls apart onto a rubber mat.

!am repeats his test with two different towers.

"is results are shown in the table below.

Number of magnets ineach leg of the tower

' 2 )

Mass held before towerfalls aart !g"

'* ' +

Tick #$%EE boxes to show which &ariables !am kept the same to make his test fair.


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the si,e of eachmagnet

the number of masses puton each tower

the si,e of each ballthe number of balls in eachtower

the si,e of the rubbermat

the number of magnets ineach tower

2 marks

(c Complete the graph by drawing the missing bar.-se the results table to help you.

' mark

(d redict the mass that could be held by a tower with four magnets in each leg.-se the results table to help you.

................................................................... g' mark

Q&. Magnets

(a Callum and /,,y want to find out the force needed to pull different bar magnets apart


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from a horseshoe magnet.

They set up the e0uipment as shown in the photo.

'allum ullsforcemeter

andhorseshoe

magnet

())y holds bar horseshoe forcemeter magnet still magnet

Callum needs to measure the force as the magnets separate.

/t is difficult. The forcemeter reading goes back to ,ero as soon as the magnetsseparate.

#ould the suggestions below help Callum get more reliable results1 #rite yes or noafter each suggestion.

*esor no1

Take a practice measurement to find outroughly when the magnets separate.

.....................

ull the forcemeter &ery 0uickly. .....................

Take the measurement three times.

.....................

-se a different horseshoe magnet each time. .....................2 marks

(b Callum measures the force using $ as the unit of measurement.

#hat unit of measurement does $ stand for1

.....................................................' mark

(c Callum and /,,y test more bar magnets. /n the table they record the force needed topull each bar magnet apart from the horseshoe magnet.


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+ar magnettested

,ength of bar magnet!cm"

-orce needed to ullmagnets aart !N"

'.* 2.*

3 *. '.4

C +. +.

5 +.* ).

#hat was the length of the weakest bar magnet1

..................................................... cm' mark

(d 3efore the test6 Callum made a prediction. "e said6 78onger magnets will need moreforce to separate them from the horseshoe magnet.%The results do not support Callum%s prediction.

5escribe how the results do not support Callum%s prediction.

.......................................................................................................................

........................................................................................................................' mark

(e Callum and /,,y think of different 0uestions they could in&estigate.

#rite true or false next to each 0uestion to show if the in&estigation would comparehow strong the magnets are.

#rueor false1

"ow many layers of paper will stop each magnet

attracting a pin1

...................

"ow many types of materials will the magnets attract1 ...................

"ow many paperclips will each magnet hold1 ...................' mark

Q. /t the swimming ool

(a /an is at the swimming pool. "e notices that the floor tiles around the pool ha&e arough surface.


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#hy are tiles with a rough surface safer than tiles with a smooth surface for peoplewith wet feet1

......................................................................................................................

......................................................................................................................' mark

(b /an floats on the water.

#hy does /an float on the water e&en though gra&ity is pulling him down1

......................................................................................................................' mark

(c s part of a test6 /an swims across the pool wearing his clothes.

"ow are the forces different when he swims in his clothes compared with when heswims in his swimming costume1

Tick #0Oboxes.

There is more weight. There is more friction.

There is less weight. There is less friction.

' mark

Q. Measuring forces

(a 8i,,ie uses a forcemeter.

!he measures the force needed to start a brick mo&ing on different surfaces.


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"ere are her results.

Surface ulling force!Newtons"

'9

3 )

C ':

5 :

#rite /6 +6 'or 3in each box below to put the surfaces in order of force needed tostart the brick mo&ing.

easiest surfaceto ull the bric4

on

hardest surfaceto ull the bric4

on

' mark

(b 8i,,ie uses the forcemeter to pull the brick on a table top.!he spreads a spoonful of oil on the table top.!he puts the brick on the oil.

#hat happens when she tries pulling the brick on the oil1


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Tick ONEbox.

The brick mo&es more easily.

The brick is harder to mo&e.

The brick will not mo&e.

The brick floats.

' mark

(c The diagram below shows three forces acting on the brick as it is pulled

on each surface.

;orce 3 makes it hard to start the brick mo&ing.

#rite the name of ;orce +below.

.....................................................' mark

Assessment SummaryTotal Mark /21

Below ExpectationsBelow 7 marksExpectations

Between 7-15 marksAo!e Expectations

Ao!e 15 marks

quick quiz_y3_forces and magnets

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