What are contact forces?

• Contact forces are forces that occur between objects in direct physical contact.

• Forces that act at a distance without physical contact.

• Forces that only occur in liquids and gases.

• Forces that are always equal and opposite in nature.

Give two examples of non-contact forces.

• Gravitational force, Magnetic force

• Normal force

• Frictional force

• Tension force

What is frictional force?

• Frictional force is the force that pulls two surfaces apart.

• Frictional force is the force that opposes the relative motion of two surfaces in contact.

• Frictional force is the force that enhances the motion of two surfaces in contact.

• Frictional force is the force that acts only on stationary objects.

How does gravitational force affect objects on Earth?

• Gravitational force causes objects to be pulled towards the Earth, giving them weight and affecting their motion.

• Gravitational force pushes objects away from the Earth, causing them to float.

• Gravitational force has no effect on the motion of objects on Earth.

• Gravitational force only affects objects in space, not on Earth.

What is the role of electrostatic force in everyday life?

• Electrostatic force plays a crucial role in everyday life by affecting interactions between charged objects, enabling technologies like printers, and causing common phenomena like static cling.

• Electrostatic force is only relevant in scientific experiments.

• Electrostatic force has no impact on technology or daily activities.

• Electrostatic force is primarily responsible for gravitational attraction.

Name a situation where frictional force is beneficial.

• Driving on a slick road

• Pushing a heavy object

• Walking on a surface.

• Sliding down a hill

Explain how gravitational force differs from electrostatic force.

• Gravitational force is always attractive and acts between masses, while electrostatic force can be attractive or repulsive and acts between charged particles.

• Gravitational force varies with distance, but electrostatic force does not.

• Electrostatic force acts only on masses, while gravitational force acts on charged particles.

• Gravitational force can be repulsive, while electrostatic force is always attractive.

What factors affect the strength of frictional force?

• The temperature of the environment

• The nature of surfaces, normal force, and presence of lubricants.

• The weight of the object

• The color of the surfaces

Describe a scenario where non-contact forces are at play.

• A magnet attracting a paperclip without touching it.

• A balloon rising when filled with helium.

• A person pushing a car to move it.

• A paperclip falling to the ground due to gravity.

How do contact forces differ from non-contact forces?

• Contact forces are always stronger than non-contact forces.

• Contact forces can only occur in liquids.

• Non-contact forces require physical touch to act.

• Contact forces differ from non-contact forces in that contact forces require physical interaction, whereas non-contact forces operate at a distance.