2. How Objects Interact

What are the two groups of forces?

• Friction and tension
• Contact and non-contact
• Nuclear and electromagnetic
• Gravitational and air resistance

Which of the following is an example of a non-contact force?

• Friction
• Tension
• Gravity
• Spring force

What is the role of friction in our daily lives?

• It makes it difficult to push objects.
• It causes rope burn.
• It helps us slow down while walking.
• All of the above.

What is tension?

• The force that attracts objects towards the center of the earth or towards any other physical body having mass.
• The force that supports objects resting on a surface.
• The force exerted through a rope when we pull something.
• The force that pulls the spring back into its natural resting length.

Which force can exist between physically separated objects?

• Friction
• Tension
• Gravity
• Spring force

Which force can slow down a moving object?

• Tension
• Friction
• Spring force
• Normal contact force

Which of the following forces is the strongest in nature?

• Gravitational force
• Nuclear force
• Electromagnetic force
• Spring force

Which forces hold protons and neutrons together in a nucleus?

• Gravitational forces
• Spring forces
• Electromagnetic forces
• Nuclear forces

Which forces act between charged objects?

• Gravitational forces
• Nuclear forces
• Electromagnetic forces
• Spring forces

Why is understanding forces important in physics?

• Forces control object interactions.
• There are only two types of forces.
• Forces cannot change shape, speed, or direction of objects.
• Nuclear forces are the strongest forces in nature.