Forces

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What primarily determines the amount of friction between two surfaces?

The presence of moisture on the surfaces

The speed at which the surfaces move

The types of surfaces in contact (correct)

The temperature of the surfaces

Which of the following is NOT a disadvantage of friction?

Causes wear and tear

Produces unwanted heat

Slows down motion unnecessarily

Provides grip on objects (correct)

Which method does NOT reduce friction?

Increasing surface roughness (correct)

Using ball bearings

Adding rollers or wheels

Applying lubricating oil

What is the effect of friction on a moving object?

It causes the object to slow down or stop Signup and view all the answers

Air resistance and water resistance are examples of what type of force?

Frictional forces Signup and view all the answers

What effect can forces have on an object?

Change the shape of an object Signup and view all the answers

What defines the weight of an object?

The gravitational force acting on the object Signup and view all the answers

How does the weight of an object change when it is moved from Earth to the Moon?

It decreases significantly Signup and view all the answers

What is the relationship between mass and gravitational force?

Greater mass results in greater gravitational force Signup and view all the answers

Which unit is used to measure weight?

Newton (N) Signup and view all the answers

What happens to a spring when a force is applied to stretch it?

It exerts elastic spring force. Signup and view all the answers

How does the weight of an object affect the extension of a spring?

Greater weight results in longer extension of the spring. Signup and view all the answers

What type of interaction occurs between two like poles of magnets?

Repulsion Signup and view all the answers

In what situation would a spring be used as a balance?

To measure the weight of an object hung on it. Signup and view all the answers

What occurs when opposite poles of two magnets are brought close together?

They attract each other. Signup and view all the answers

What is the main purpose of rough strips placed on the edges of stairs?

To increase friction and prevent slipping Signup and view all the answers

How does chalk help athletes in sports like gymnastics or rock climbing?

It absorbs moisture to increase friction for better grip Signup and view all the answers

Why are wheelchair ramps designed with textured surfaces?

To increase friction and prevent slipping Signup and view all the answers

What is the purpose of using snow chains on car tires?

To enhance friction and improve grip on icy surfaces Signup and view all the answers

What is a potential consequence of worn strips on stairs?

They will become smoother, reducing friction Signup and view all the answers