Physical Science Ch 11 Study Guide

The distance traveled by an object divided by the time it takes to travel that distance is called

• average velocity

• average speed

• average acceleration

• negative acceleration

On a distance vs. time graph, the line of an object at rest is a

• curved line with a slope of zero

• flat line with a slope of zero

• jagged line with a negative slope

• curved line with a positive slope

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An example of helpful friction is

• car tires wearing out

• getting holes in your socks

• scraping your knee on the floor.

• writing on paper with a pen

The difference between speed and velocity is that velocity includes

• direction

• distance

• time

• weight

Force is a quantity made up of

• weight and speed

• magnitude and direction

• time and acceleration

• mass and velocity

An object is in motion when

• the net force acting on the object is zero

• friction occurs

• the object's displacement is greater than the distance traveled.

• the object's changes position relative to a frame of reference.

Friction is defined as the

• force that opposes motion between two surfaces that are touching

• rate at which velocity changes

• resistance of an object to a change in its velocity

• speed of an object in a particular direction

Which is an example of balanced forces acting on an object?

• a kangaroo jumping

• a car turning a corner

• a person standing on the ground

• a person pushing a sofa

Acceleration is defined as the change in velocity divided by

• speed

• final velocity

• time

• distance

Which is an example of kinetic friction?

• friction between a car's windshield and the air as you drive into the wind

• friction between your shoes and the ground when you stand still

• friction between a sticky note and the page of a book as it marks your place

• friction between your skin and a pencil as it rests in your palm