8.3 Types of forces - Contact

Which of the following is NOT an example of a contact force mentioned in the text?

• Gravity

• Friction

• Elastic force

• Buoyancy force

Friction is a contact force that:

• Always acts in the same direction as the relative motion.

• Slows down moving objects.

• Is stronger on smooth surfaces.

• Has no effect on the movement of objects.

What is the term for the type of friction that allows your shoes to grip the floor when walking?

• Traction

• Lubrication

• Drag

• Elasticity

Tags

NGSS.MS-PS2-2

How does friction depend on the weight of an object?

• Heavier objects experience less friction.

• Heavier objects experience more friction.

• Friction is not affected by the weight of an object.

• Friction only affects very light objects.

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NGSS.MS-PS2-2

What is the primary purpose of using lubrication like oil or graphite between surfaces?

• To increase friction

• To generate more heat

• To reduce friction

• To make surfaces stick together

How do wheels reduce friction when moving heavy loads?

• By increasing friction between the wheels and the ground

• By creating more heat through friction

• By spreading the weight over a larger area

• By making it difficult to steer

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NGSS.MS-ETS1-2

What term is used to describe the upward push that occurs when an object is submerged in a liquid?

• Elastic force

• Impact force

• Traction

• Buoyancy force

How does air resistance affect streamlined objects like arrows?

• It has no effect on streamlined objects.

• It slows them down significantly.

• It speeds them up.

• It depends on the material of the object.

What type of force is exerted when a bow is drawn to shoot an arrow?

• Traction

• Elastic force

• Buoyancy force

• Impact force

Tags

NGSS.MS-PS2-1

According to the text, what is the primary function of wearing a helmet while cycling or motorcycling?

• To make the rider look stylish

• To improve visibility on the road

• To reduce the risks of serious head injuries

• To increase the impact forces on the head