Fuerzas y máquinas en la internet

A contact force occurs when...

• two objects do not touch.

• an object stops moving.

• two objects touch each other.

Answer explanation

A contact force occurs when two objects touch each other, allowing them to exert forces on one another. This is in contrast to non-contact forces, which act at a distance without physical contact.

All machines require...

• sunlight to operate.

• electricity.

• energy to operate.

Answer explanation

All machines require energy to operate, which can come from various sources like electricity, fuel, or even sunlight. However, the most general and accurate answer is that they need energy.

A pulley is a...

• simple machine.

• complex machine.

• means of transportation.

Answer explanation

A pulley is classified as a simple machine because it consists of a wheel and a rope, allowing for the easy lifting of loads. It does not involve complex mechanisms, making 'simple machine' the correct choice.

Steam engines use energy from...

• electricity.

• gas.

• coal.

Answer explanation

Steam engines primarily use coal as their energy source. Coal is burned to produce steam, which drives the engine. Electricity and gas are not the main fuels for traditional steam engines.

The internet has changed drastically...

• communications.

• the diet.

• the forces.

Answer explanation

The internet has revolutionized how we communicate, making it faster and more accessible. While it has impacted various aspects of life, the most significant change is in communications, making it the correct choice.

The internet is...

• a web browser.

• a type of forum.

• a global network that connects computers.

Answer explanation

The internet is best described as a global network that connects computers, allowing them to communicate and share information. The other options do not accurately represent the internet's function.

A URL is...

• a unique website name.

• a type of application.

• a wi-fi network.

Answer explanation

A URL (Uniform Resource Locator) is a unique address used to access a specific website on the internet, making 'a unique website name' the correct choice. The other options do not accurately describe what a URL is.

Google and Yahoo are...

• social networks.

• search engines.

• steam machines.

Answer explanation

Google and Yahoo are primarily known as search engines, which allow users to find information on the internet. They are not social networks or steam machines, making 'search engines' the correct choice.

Fake news is...

• false information.

• inappropriate content.

• irrelevant information.

Answer explanation

Fake news refers specifically to false information that is presented as news, misleading the audience. The correct choice is 'false information' as it directly defines what fake news is.

Netiquette is...

• a set of rules for using the internet.

• an online account.

• a shopping website.

Answer explanation

Netiquette refers to the set of rules and guidelines for appropriate behavior and communication on the internet. It helps users interact respectfully and effectively online, making 'a set of rules for using the internet' the correct choice.