Forces in Action

What is the SI unit of force?

• Newton (N)

• Watt

• Joule

• Volt

Define force according to Newton's first law of motion.

• Force is any interaction that, when unopposed, will change the motion of an object.

• Force is only applicable in space.

• Force is a measure of an object's mass.

• Force is the same as velocity in physics.

Explain the difference between contact and non-contact forces.

• Contact forces only occur in outer space.

• Contact forces are stronger than non-contact forces.

• Contact forces involve magnets, while non-contact forces involve friction.

• Contact forces require physical contact between objects, while non-contact forces act at a distance without direct contact.

Give an example of a contact force.

• Force exerted by magnets on each other

• Force exerted by protons on each other

• Force exerted by hand on a book on a table

• Force exerted by gravity on an object

What is the force that opposes the motion of objects through air or water?

• thrust

• lift

• push

• drag

What is the force that pulls objects towards the center of the Earth?

• magnetism

• friction

• repulsion

• gravitational force

Explain the concept of frictional force.

• Frictional force is the force that attracts objects together.

• Frictional force is the force that increases the speed of an object.

• Frictional force is the force that causes objects to float.

• Frictional force is the force that opposes sliding

What is the force that acts on an object when it is pulled or pushed against a surface?

• Resistance

• Traction

• Slipperiness

• Friction

Define gravitational force and provide an example.

• Gravitational force causing objects to float in mid-air

• The gravitational force between the Moon and the Sun

• Gravitational force only exists in outer space

• Example: The gravitational force between the Earth and an object on its surface, causing the object to accelerate towards the ground.

What is the force that occurs when two surfaces slide past each other?

• Glide

• Slippery

• Traction

• Friction