Understanding Dynamic Friction and Motion

What should you be familiar with before learning about dynamic friction?

• How to analyze proportionality relations

• How to measure temperature

• How to draw maps

• How to calculate speed

What type of force is friction?

• A magnetic force

• A contact force parallel to the surface

• An electrical force

• A gravitational force

What is the correct statement according to Newton's first law?

• Objects naturally want to stop

• Objects naturally want to maintain a constant velocity

• Objects naturally want to accelerate

• Objects naturally want to move in circles

What happens to an object moving in space with no friction?

• It moves at a constant velocity

• It accelerates

• It stops

• It slows down

What does the coefficient of dynamic friction indicate?

• The slipperiness or grippiness of surfaces

• The weight of an object

• The speed of an object

• The temperature of surfaces

What is the relationship between dynamic friction and the normal force?

• Dynamic friction is equal to the normal force

• Dynamic friction is inversely proportional to the normal force

• Dynamic friction is not related to the normal force

• Dynamic friction is proportional to the normal force

When does the equation for dynamic friction apply?

• When two solids slide past each other

• When an object is stationary

• When a liquid slides past a solid

• When a round object rolls over a solid

What is the first step in solving a problem involving dynamic friction?

• Measure the temperature

• Draw a map

• Copy all important information given in the question

• Calculate the speed

How do you find the weight force in a dynamic friction problem?

• By measuring the temperature

• By drawing a map

• By multiplying the total mass and the acceleration due to gravity

• By calculating the speed

What happens to the friction force when the normal force increases?

• The friction force increases

• The friction force decreases

• The friction force becomes zero

• The friction force remains the same