4th science P3P3

What is force?

• Force is the speed of an object.
• Force is an interaction that causes an object to accelerate.
• Force is the mass of an object.
• Force is a type of energy.

What happens when you move a box or lift your backpack?

• Lifting a backpack requires no effort at all.
• You are applying force

• The object stays in the same place regardless of your actions.
• The box moves on its own without any force.

What do two objects do when they interact?

• They exert forces on each other.
• They only change their colors when they interact.
• They remain unaffected by each other.
• They attract each other without any force.

What are the two types of forces?

• Frictional forces and gravitational forces
• Magnetic forces and electrical forces
• Contact forces and non-contact forces
• Centrifugal forces and centripetal forces

What is a contact force?

• A contact force is a type of energy that can be stored in objects.
• A contact force is a force that only acts on moving objects.
• A contact force is a force that acts between two objects that are in direct physical contact.
• A contact force is a force that acts at a distance without physical contact.

Give an example of a contact force?

• Gravity
• Magnetism
• Tension
• Someone pushing a box

What is a non-contact force?

• A non-contact force is a force that acts at a distance without physical contact.
• A non-contact force is a type of frictional force.
• A non-contact force is only applicable in space.
• A non-contact force requires physical touch to act.

How can objects be classified based on their reaction to force?

• Objects can be classified as solid, liquid, or gas based on their reaction to force.
• Objects can be classified as heavy, light, or medium based on their reaction to force.
• Objects can be classified as elastic, plastic, or brittle based on their reaction to force.
• Objects can be classified as static, dynamic, or kinetic based on their reaction to force.

What are rigid objects?

• Rigid objects can easily change shape under pressure.
• Rigid objects are always made of metal.
• They are objects that only change when a very strong force is applied.

• Rigid objects are flexible and can bend easily.

Give examples of rigid objects

• Examples of rigid objects include a metal rod, a wooden plank, a glass bottle, and a ceramic vase.
• A pillow
• A sponge
• A rubber band