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How does making the block lighter allow it to travel further?

energy which converts into lesser kinetic energy. Because of this the car would actually go a shorter distance instead of going further.

State one effect on the sound produced. Explain your answer.

[Answer using CER]

The spring will hit the fixed support harder

Because the spring is stiffer

It is because when the switch is closed, electricity will flow through in the circuit. The two iron rods would be magnetised and become electromagnets the hammer Would move up but as the spring is stronger, it would be harder to compress, taking a longer time to compress, so the sound would be slower.

When the switch is closed electricity will flow through the circuit, making DC AB an electro magnet which is connected to the fixed support . Then there will be force to push the spring but the spring is stiffer , so that more force will be made

E: the spring was stronger

R: pq will still be attracted to ba and dc but the stiffness of the spring will make pq move toward ba and cd slower so the sound produced will be slower.

As there is more resistance from the stiffer spring making the attraction slower therefore causing the speed of the hammer to decrease and have less kinetic energy

Causing the sound to soften due to the hammers slower speed

E: it is because when the switch closed , the electricity will flow through in the circuit. The two iron rods will be magnetised and become electromagnets.

R:The hammer would move up but the spring would be stronger. It would take longer time to compress.

When the switch is closed, electricity will flows through the circuit causing the iron rods to be magnetised into electromagnets and they will attract pq.[e] But since the spring is stiffer, it will be harder for it to hit the bell and more sound energy will be produced .[r]

E :The spring is stiffer

R: There will be less force when the hammer hits the bell

E:P would be repelled, making the hammer hit the bell, the spring will then pull it back again and P would get repelled again causing the hammer to hit the bell, if you switch the spring to a stronger one, as the hammer hits the bell, the sound would be louder compared to last time

R: if you switch the spring to a stronger one, the sound produced will become louder

E: As the spring was switched to a stiffer/stronger one.

R: The stiff/stronger spring would be harder to compress, also having lesser elastic spring force, therefore the sound produced would be softer than before.

E : When the switch was closed, electricity will flow through the circuit, causing PQ to become an electromagnet. Since the spring is stronger, it is harder for it to be compressed.

R : It will cause the sound produced by the bell to be softer.

E : When the spring is changed into a stronger spring, it means that the spring is stiffer. A stiffer spring requires a greater force to get compressed.

R : When AB and CD gets magnetised and becomes electromagnets, PQ gets attracted to AB and CD at a slower rate, causing the sound produced by the bell to be softer.

Give a reason for your answer (claim).

E : A stronger is stiffer. The stiffness of a spring will NOT affect the upward magnetic force by AB and CD on PQ.

R : The only factors that will affect magnetic force are the number of batteries and the number of wire coils coiled around AB and CD.

C (Repeated) : Hence, there is no change in the amount of upward magnetic force of attraction by AB and CD on PQ with a stronger spring.

Student B & C: Searcher - Share information from HDB link in SLS during discussion.

Student D: Security - Makes sure members are on task.

Material(s) used: Metal

Property(ies) of material: Strong and stiff

Type(s) of force(s) in action: Frictional force

Safety benefit(s): Elderly will not slip and fall easily.

(i)

(ii)

1 thing we can improve in our safety feature

(i)

Material(s): Stainless steel and titanium

Property: waterproof

Forces: magnetic force to stick on to fridge if elderlies do not want to hold on to it.

Safety benefits: provide individuals with a way to seek help in case of a medical emergency.

Materials used:sandpaper

Properties of material:rougher surface between floor and feet, increase friction acting on the floor.

Types of forces in action: friction

Safety benefits: the elderlies walking would not fall.

Material(s) used: Rubber

Property(ies) of material: Flexible, durable, and non-slip surface.

Type(s) of force(s) in action: Frictional force.

Safety benefits: Prevent elderly from bumping into sharp edges, get injured and get sent to hospital.

Property(ies) of material: Strong and durable.

Type(s) of force(s)in action: Frictional force. Safety benefits: Allows easy accessibility for elderlies with wheelchair. For elderlies without wheelchairs, they can also get support from the railings.

Material(s) used: fabric

Property(ies) of material: rough

Type(s) of forces(s) in action: frictional force

Safety benefit(s): elderly will not slip and fall easily

Materials used: stainless steel

Properties of materials: stiff and strong. It wont rust.

Types of forces in action: friction

Safety benefits: To assist seniors during sitting and standing actions.

Material: rubber

Property of material: soft and durable

Type of force: when an elderly hits against the corner, the rubber can help to reduce damage or injuries

Materials used: Metal

Property of material: stiff and strong

Type of forces in action: Pushing force

Safety benefit: Installed to assist seniors during sit-to-stand action.

Name of safety feature : Automatic door.

Material(s) used : metal, wood, magnets and plastic. Property(ies) of materials : Strong and stiff, magnetic. Type(s) of force(s) in action : Magnetic force. Safety benefit(s) : the elderlies will not struggle and injure themselves while opening heavy doors be cause the magnets will repel and they will not hve to push the door.

Material :Rubber

Property : Flexible,Waterproof

Types of forces in action :Friction

Safety benefits : The suction cubs will reduce slipping risks.

Material(s):rubber soles

Property(ies) of material:more friction against floor

Type(s) of force(s) in action:friction

Safety benifit(s):it helps make the floor less slippery so the elderlies will not fall

Safety benefits:The bathroom is slippery, they can hold onto the pole to walk.

Material(s) used: Ceramic,porcelain,natural stones

Property(ies) of material: anti-slip

Types of force(s) in action: friction

Safety benefits: it prevents the risk of injuries as it prevents the elderly from falling.

Material(s) used: Metal Plastic

Property(ies) of material: Stiff Strong

Type(s) of force(s) in action: Friction

Safety benefit(s): Help elderly to get out of bed more easily and to provide support.

Materials used: Metal

Properties of material: Strong, stiff and durable

Types of forces used: Frictional force

Safety benefits: Provides support, enhance stability and reduce risk of falls by offering a secure grip and aid in navigating various spaces

Material(s) used: Rubber or synthetic soles

Property(ies) of material: waterproof strong

Type(s) of force(s) in action: Frictional force

Safety benefit(s): It prevents the elderly from falling and decreases the risk of injury

Material : stainless steel ,Nylon

Property: strong,non-flexible

Type's of forces on action : Frictional force,Gravitational force

Safety benefits :Can help the elderly walk or stand up and reduces slipping risks.

Material used:plastic,metal

Property of material:small, easy to hold

Types of force is action:force control

Safety benefits: The elderly don't need to stand up to turn on the lights or turning on the tv reducing the chance to stand up and fall or breaking a hip when they stand up from their bed

Material(s) used:Plastic, Metal

Property(ies) of material: Strong

Type(s) of force(s) in action: Electrical energy, Magnetic force, Sound energy

Safety benefit(s): If elderly falls, alarm will sound which will bring awareness to elderly. Prevent falls and wandering.

Material(s) used:Memory foam,latex and metal

Property(ties) of materials: the bedding can be soft and the metal can be used to block the elderlies from falling off the bed

Type(s) of force(s) in action: friction and chemical potential energy

Safety benefits: the elderlies can get out and in of bed easily while sitting up.

2.we like that the anti slip slippers cause it looks cool

What we can improve

1.adding ,ore info abt out safety feature

I think we can improve in being neater in our work

I like that I added a picture to let others visualise my idea.

I like that i described my safety feature well.

(i) it prevents accidents as safety feature two helps the elderlies to stand, support them. Safety feature one makes the floor rougher, preventing the elderlies from falling and injuring themselves.

(ii) used stainless steel as the material so object won’t rust

1 thing we can improve in our safety feature

(i) we can be more precise about the picture

(i)It has magnetic force

(ii)It is convenient for the elderlies

1 thing we can improve in our safety feature

(i)It could have been able to sense ppl.

We also like discussing and collaborating to get the work done fast.

One thing we would like to improve on is being focused and getting more different ideas.

(i) It is unique

(ii) We talked about the things of the safety feature clearly

1 thing we can improve in our safety feature

(i) We need to add the photo

-our pictures we uploaded

-our ideas we came up with to help the elderlies

1 thing to improve on

-adding more forces related to helping the elderlies

(i) It prevents the elderlies from getting into accidents.

(ii) It lets us be more thoughtful towards our elderlies and be more concerned for them.

One thing I can improve on my safety feature:

(i) To make it less common in houses.

(i) its easy to get in everyday lives

(ii) effective for the elderly

1 thing we can improve in our safety feature

(i) be more creative for our safety features

1)It can reduce slipping chances and reduce elderly death rate.

2)It is cheap and affordable.(except for the remote)

One thing I can improve on is suggesting more affordable and healthy things(remote).

Material : Steel

Property : wear and tear less

Forces : Frictional force

Safety benefits : Elderlies would not trip over the stairs.

Evidence: The number of batteries in the circuit and number of coils around the iron rods AB & CD remained the same.

Reasoning: The magnetic force exerted by the electromagnets remained the same. A stronger spring will only cause a smaller amount of resulting upward force for hammer to hit the bell.

Plant P also carries out photosynthesis, producing oxygen. The oxygen produced is used by Animal W for respiration, thus allowing it to survive.

Plant P also gives shelter for Animal W.

-Ella