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Chapter 1 & 2 Forces and Motion 8th
Chapter 1 & 2 Forces & Motion 8th
28
Science
8th Grade
05/07/2012

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Term
Chapter 1 & 2 Forces & Motion
8th
Definition
Term
When an object's distance from another object is changing
Definition
It is in motion
Term
Speed equals distance divided by
Definition
Time
Term
The rate at which velocity changes is called
Definition
Acceleration
Term
Jupiter accelerates because it is
Definition
Continuously changing direction
Term
If you know a car traveled 300 kilometers in 3 hours you can find its
Definition
Average Speed
Term
When 2 forces act in the same direction
Definition
They add together
Term
The tendency of an object to resist change in its motion is known as
Definition
Inertia
Term
The force that one surface exerts on another when the 2 rub against each other is known as
Definition
Friction
Term
The law of universal gravitation states that any 2 objects in the universe, without exception
Definition
Attract each other
Term
According to the law of conservation of momentum, when 2 objects collide in the absence of friction
Definition
The total momentum stays the same
Term
In physical science, a push or pull is called
Definition
Force
Term
An example of increasing friction intentionally is
Definition
Throwing sand on an icy driveway
Term
A leaf flutters instead of dropping straight to the ground when it falls from a tree because it experiences
Definition
Air resistance
Term
According to Newton's third Law of Motion, when a hammer strikes and exerts force on a nail, the nail
Definition
Exerts an equal force back on the hammer
Term
If a toy car traveling at 10cm/s passes a toy car moving at 10cm/s in the opposite direction, both cars have the same
Definition
Speed
Term
The SI unit of ACCELERATION is
Definition
meter/second/second
Term
The property of matter that resists a change in motion is called
Definition
Inertia
Term
According to Newton's second law of motion, force equals mass times
Definition
Acceleration
Term
One NEWTON
Definition
Force required to accelerate 1kg of mass at 1 meter per second per second
Term
A person traveling in a car that stops suddenly keeps moving forward due to
Definition
Momentum
Term
The downward force acting on an object in free fall is the force of
Definition
Gravity
Term
The amount of matter in an object is called its
Definition
Mass
Term
According to Newton's 3rd law of motion, the strength of a reaction force is
Definition
EQUAL TO the strength of the action force
Term
The momentum of an object is in the same DIRECTION as
Definition
Its velocity
Term
Friction acts in a direction
Definition
OPPOSITE to an object's direction of motion
Term
Air resistance is a type of
Definition
FRICTION
Term
Acceleration =
Definition
Increase speed or
Decrease speed or
Change direction
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