ESL 5 Science / 11.2 Forces and Motion

ESL 5 Science / 11.2 Forces and Motion

Multiple Choice

Units of force are the _____ and the pound.

• gravity

• hour

• Newton

• thrust

Multiple Choice

An arrow can be used to represent the direction and _____ of a force.

• color

• drag

• speed

• strength

Multiple Choice

Three types of force act on an airplane: _____, lift, and drag.

• direction

• pound

• thrust

• weight

Multiple Choice

The force that pulls all objects together is called _____.

• friction

• gravity

• momentum

• reaction force

Multiple Choice

The amount of friction depends on two factors: the roughness of the _____ of the objects and how much force is required to push the two objects together.

• air resistance

• smooth

• surface

• weight

Multiple Choice

I am the tendency of an object to stay in motion.

• acceleration

• inertia

• mass

• motion

Multiple Choice

According to the law of inertia, an object at rest tends to stay at rest, and an object in motion tends to stay in motion, unless acted upon by a(n) _____.

• balanced force

• friction

• mass

• unbalanced force

Multiple Choice

According to Newton's second law, an object's acceleration increases as the amount of unbalanced force on it increases; an object's acceleration decreases as the object's mass _____.

• accelerates

• decreases

• increases

• stays the same

Multiple Choice

When one object pushes on a second object, the second object pushes back on the first object with the same _____.

• deceleration

• force

• speed

• weight

Multiple Choice

According to Newton's third law, for every action there is a(n) _____ but opposite reaction.

• action

• equal

• opposite

• strong