Unit 1 Test Review

Which is an example of motion in exactly two dimensions?

• A bicycle traveling forward in a straight line on a level street

• A soccer ball kicked along the ground by one player directly to another

• A baseball traveling with a vertically arcing trajectory from a batter to an outfielder

• An airplane taking off from a runway that simultaneously rises into the air and veers right

Which is an example of two-dimensional motion?

• a bird flying in the air

• a leaf falling from a tree

• a train traveling along a track

• a lady bug crawling on a soccer ball

An object is in projectile motion if it

• accelerates horizontally.

• accelerated both horizontally and vertically.

• is accelerated horizontally and downward by gravity.

• is thrown with a horizontal path, accelerated downward by gravity, and is not accelerated horizontally.

Displacement is to velocity as ____________ is to acceleration.

• direction

• speed

• time

• velocity

The figure shows a stone being whirled in uniform circular motion. At the point labeled B on the figure, a student draws a velocity vector and an acceleration vector. The two vectors will be

• opposite to each other.

• parallel to each other

• antiparallel to each other.

• perpendicular to each other.