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Chapter 2 Review
This is about speed, distance, force, velocity, etc.
38
Science
7th Grade
05/22/2007

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Term
Force
Definition
A push or pull.
Term
Net Force
Definition
combination of all forces acting on an object.
Term
Balanced Force
Definition
two or more equal forces whose effects cancel each other out.
Term
Unbalanced Force
Definition
two or more unequal forces acting on an object causing the object to accelerate.
Term
Action Reaction forces
Definition
rate of change of velocity
Term
Acceleration
Definition
rate of cahnge of velocity; can cause an object to speed up, slow down, or turn, and can be calculated by dividing the change in speed by the given time
Term
Newtons 1st Law
Definition
states that objects at rest will remian at rest or move with a constant velocitity unless a force is applied
Term
Newtons 2nd Law
Definition
states that an object acted upon by a net force will accelerate in the direction of the force
Term
Newtons 3rd Law
Definition
states that forces always act in equal but opposite pairs
Term
friction
Definition
rubbing force that acts against the motion between 2 touching surfaces and always slows an object down
Term
static friction
Definition
the type of friction that orevents an object from moving a force is applied
Term
rolling friction
Definition
exerts the force on the wheels that pushed an object forward
Term
sliding friction
Definition
slows down an object that slides
Term
inertia
Definition
tendency of an object to resist a change in its motion
Term
gravity
Definition
what keeps you from flying away
Term
mass
Definition
amount of matter in an object
Term
air resistance
Definition
what helps an object stop
Term
weight
Definition
the gravitational force between you and the Earth
Term
false
Definition
an object in motion will stop, eventually, if there is no friction, air resistance, or gravity.
Term
false
Definition
weight is the amount of matter in an object
Term
true
Definition
an object will move in the same direction as the force applied to it.
Term
true
Definition
if an object is at rest, then no forces are acting on it.
Term
false
Definition
mass is the measure of how hard gravity is pulling you down
Term
false
Definition
one reason an object speeds up is because of the force called friction.
Term
false
Definition
when you are walking to lunch, you are experiencing rolling friction.
Term
true
Definition
a force is any push or pull on an object.
Term
false
Definition
if two forces are balanced, the object the forces are applied to will move.
Term
true
Definition
if two equal forces are opposite directions, they will cancel each other out.
Term
false
Definition
if you push on a wall while wearing roller skates, you will move in the direction you are pushing.
Term
Inertia
Definition
newton's first law of motion can be summerized by which word?

a) Terminal Velocity b)friction

c)normal force d)inertia
Term
(kg)(m/s squared)
Definition
Which combination of units is equivilent to the Newton?

a) m/s squared b) (kg)(m/s squared)

c) (kg)(m/s squared) d) kg/m
Term
Mass
Definition
The amount of matter in an object is called its ___________

a) mass b) force

c) weight d) balance
Term
Rolling Friction
Definition
Which is the best description of a car's breaks being applied to slow the vehicle?

a) Gravity b) Static Friction

c) Sliding Friction

d) rolling friction
Term
Acceleration
Definition
All the following have a direction associated with it, except for which one?

a) velocity b) acceleration

c) mass d) force
Term
friction
Definition
What is the name of the force that exists between any two objects with mass?

a) gravity b) mass

c) friction d) air resistance
Term
Sum
Definition
What term describes the total force felt by an object?

a) strong b) sum

c) net d) balanced
Term
friction
Definition
Which force describes any two surfaces the rub against each other?

a) Gravity b) acceleration

c) friction d) momentum
Term
tennis ball
Definition
Which of the following will travel the farthest if hit by a baseball bat with equal force.

a) ping-pong ball b) baseball

c) bowling ball d) tennis ball
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