VECTORS AND FRICTION

If a car moves 12 miles North, 19 miles East, and 12 miles South, what is its displacement?

• 43 miles, East

• 31 miles

• 19 miles, East

• 12 miles

• Resultant Vector

• Sine Rule

• Cosine Rule

• Pythagorean Theorem

How can we show a vector using a drawing?

• A vector can be shown as an arrow with a specific direction and length.

• A vector can be represented as a point on a graph.

• A vector can be illustrated using a line segment without direction.

• A vector is shown as a circle with a radius.

 Amy runs 2 miles south, then turns around and runs 3 miles north. What is displacement?

• 2 miles south

• 5 miles

• 1 mile 

• 1 mile north 

Which of the following best describes the magnitude of a vector?

• The length of the vector regardless of its direction.

• The direction in which the vector points.

• The angle formed by the vector with the horizontal axis.

• The sum of the components of the vector.

Rougher surfaces have ...

• no friction

• less friction

• greater friction

• the same level of friction

 What is the force of friction between a block of ice that weighs 950 N and the ground if μ = 0.12? 

• 65 N

• 226 N

• 175 N

• 114 N

What are the units on the coefficient of friction?

• none

• Newtons

• meters

• kilograms

Explain the difference between static friction and kinetic friction.

• Static friction and kinetic friction are the same thing and can be used interchangeably.

• Static friction is stronger than kinetic friction, while kinetic friction is stronger than static friction.

• Static friction occurs when two surfaces are not moving relative to each other, while kinetic friction occurs when two surfaces are sliding past each other.

• Static friction occurs when two surfaces are moving relative to each other, while kinetic friction occurs when two surfaces are not moving.

Which equation can be used to calculate the static friction force?