Vocabulary
Friction
A baseball rolling across the grass is an example of this force.
Friction
Which Law of Motion is described... "The unbalanced force on an object is equal to the mass of the object multiplied by its acceleration: f = m x a
Newton's Second Law
Newton's first law is called?
An object at rest tends to stay at rest and an object in constant motion tends to stay in motion unless acted upon by an unbalanced force.
Who is the unit of force named after?
Sir Isaac Newton
When forces act on an object without changing its motion it is called _____. These often point in opposite directions and always add up to zero.
Balanced forces
A bus moving at a constant speed is an example of this force.
Balanced force
An object staying at rest would be explained by this Law of Motion (Newton's first, second or third)?
Newton's First Law of Motion
If you push on a wall, it will push back on you as hard as you are pushing on it. Which law of motion is this?
Newtons Third Law of Motion
All forces occur in pair and these two forces are equal in strength and opposite in direction.
The force that attracts a body toward the center of the earth, or toward any other physical body having mass
Gravity
Any push or pull from one object to another is called _________.
Force
A bus accelerating speed down the highway has what force acted upon it?
Unbalanced force
Which Law of Motion is described as: All forces occuring in pairs, and these two forces are equal in strength and opposite in direction?
Newton's Third Law of Motion
Which law says something about, "...a body in motion remaining in motion?"
Newton's First Law
"A body in motion remains in motion (at a constant velocity) until an unbalanced force acts on it."
What is produced when force acts on a mass?
Acceleration
F = m x a
A force that causes an object to change its motion is called _______________.
Unbalanced force
What are pushes, pulls or lifts?
Forces
Which of Newton's Law is sometimes called the law of inertia? This is because the law describes inertia: objects do not change their motion unless forced to do so.
Newtons First Law
Two model rockets are launched using indentical engines which exert identical forces. Which Law descibes why the heavier rocket has a smaller acceleration.
Newton's Second Law
From F=ma the force is the same and mass is larger. If the mass is larger then mathematically the acceleration must be smaller.
For every action there is an equal and ________ reaction.
opposite
The push of the first object on the second is called _______ force. The push of the second object back on the first is called the _______ force.
1. Action 2. Reaction
A baseball is thrown to the bat from the left as the bat hits it and forces the ball to the right. This is an example of what forces acting upon it?
Action and reaction forces
What is the equation of Newton's Second Law of motion?
F = m x a
A heavy person may kick the ball higher because the heavy person has more mass. Which Law of motion is described?
Newton's Second Law of Motion
The unbalanced force on an object is equal to the mass of the object multiplied by its acceleration.
F = m x a
A 14.5 gram rocket is launched by an engine that exerts an average force of 8.00 N. What is the rocket's acceleration?
F=m x a
8.00N = (0.0145kg)(a)
a=551.7 m/s2