Question

C. Name the simple machines used in the following cases.
1. Cutting paper with scissors.
2. Catching a fish with a fishing rod.
3. Picking up ice with ice tongs.
4. Screwing the lid of a jam bottle.
5. A crane is used to lift heavy objects.
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Science . Part-5 • 17​

Answer 1

Answer:

cutting paper with scissors

Explanation:

Because it always available to us

Answer 2

C. Name the simple machines used in the following cases.

1. Cutting paper with scissors.

2. Catching a fish with a fishing rod.

3. Picking up ice with ice tongs.

4. Screwing the lid of a jam bottle.

5. A crane is used to lift heavy objects.

Teacher's Signature :

Science . Part-5 • 17​

Explanation:

Mechanical devices that change the direction and magnitude of the applied force are known as simple machines. Most of the modern machines use the principle of one or more simple machine. some common  simple machine include pulleys, levers, wedges etc.

1. Cutting paper with scissors- It uses the principle of lever to move the two parts of the scissors and the cutting action is due to the wedging action of the machine.

2. catching a fish with a fishing rod- the pulley is used as a simple machine in this process where the winding off the fishing rope pulls the fish out of the water

3. picking up ice with ice tongs- It uses the principles of a second class lever.

4. Screwing the lid of a jam bottle- the simple machine involved is a screw.

5. A crane is used to lift heavy objects-  the simple machine involved is a pulley where the counterweights of a crane magnifies the pulling force which helps in lifting heavy objects,