Feel the force

What is gravity?

• A type of friction between air and another material.

• The force by which a planet or other body draws objects towards its center.

• The force that pushes an object up in water.

• A long piece of material used for lifting.

Answer explanation

Gravity is the force that attracts objects towards the center of a planet or other celestial body, making it the correct choice. The other options describe different physical phenomena unrelated to gravity.

What is a lever?

• A type of friction between air and another material.

• A long piece of a certain material used for lifting or opening something by placing one end of it under an object and pushing down on the other end.

• The force that makes it difficult for one object to slide along the surface of another.

• The force by which a planet draws objects towards its center.

Answer explanation

A lever is a simple machine that consists of a long piece of material used to lift or open objects. By placing one end under an object and pushing down on the other end, it allows for easier movement of heavy items.

What is a pull factor?

• Force that drives people away from a place.

• Force that draws people to move to a new place.

• A type of contact interaction.

• A force that stops movement.

Answer explanation

A pull factor is a force that draws people to move to a new place, such as job opportunities or better living conditions, distinguishing it from push factors that drive people away.

What do all objects do because of gravity?

• Repel each other.

• Attract other objects.

• Move faster.

• Stop moving.

Answer explanation

All objects attract other objects due to gravity. This fundamental force pulls masses toward each other, which is why the correct answer is 'Attract other objects.' The other options do not accurately describe the effect of gravity.

What does friction do when an object moves across a surface?

• Speeds up the object.

• Acts as an opposite force.

• Makes the object fly.

• Stops the object completely.

Answer explanation

Friction acts as an opposite force when an object moves across a surface, resisting its motion. This force can slow down the object or prevent it from moving, making 'acts as an opposite force' the correct choice.

Which of the following is a type of force?

• Gravity

• Light

• Sound

• Color

Answer explanation

Gravity is a fundamental force that attracts objects with mass towards each other, making it a type of force. Light, sound, and color are not forces; they are forms of energy or phenomena.

What is the mass of an item measured in?

• Newtons

• Liters

• Grams/Kilograms

• Meters

Answer explanation

The mass of an item is measured in grams or kilograms, which are units of mass. Newtons measure force, liters measure volume, and meters measure length, making grams/kilograms the correct choice for mass.

What happens when similar poles of magnets are placed near each other?

• They attract

• They repel

• They stick together

• They melt

Answer explanation

When similar poles of magnets (north-north or south-south) are placed near each other, they repel each other due to the magnetic force. This is why the correct answer is 'They repel'.

What is the force needed to pull an object called?

• Mass

• Buoyancy

• Weight

• Volume

Answer explanation

The force needed to pull an object is referred to as its weight. Weight is the gravitational force acting on an object, which depends on its mass and the acceleration due to gravity.

What is the upward-directed force that helps objects float in water?

• Gravity

• Buoyancy

• Friction

• Magnetism

Answer explanation

Buoyancy is the upward-directed force that allows objects to float in water. It counteracts gravity, enabling objects less dense than water to rise and remain afloat.