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Science.4 Newton's Laws / Physics
Studying Newton's Laws and Physics
28
Science
05/25/2011

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Term
Define "force".
Definition
A push or a pull
Term
What are three things that energy from a force cause?
Definition
Start, Stop or Change in direction of object
Term
What do velocity and acceleration and momentum have in common?
Definition
They include direction.
Term
Two forces are being exerted in the same direction on an object. How do you calculate the total force of the object?
Definition
Add the 2 forces together
Term
Two forces are being exerted in the opposite direction on an object. How do you calculate the total force of the object?
Definition
Subtract the 2 forces
Term
If forces are applied to an object and it moves. The force is known as what type of force?
Definition
Unbalanced force
Term
If opposite forces are applied to an object and all the forces are equal where there is no movement. the force is know as what type of force?
Definition
balanced force
Term
What would happen to an object in motion if there was no friction?
Definition
It would continue to travel forever.
Term
A baseball is lying on a field. What must be true about the forces acting on it?
Definition
The forces are balanced.
Term
Define inertia.
Definition
The tendency of objects to remain in motion or stay at rest. OR The property of matter that tends to resist any change in motion.
Term
How does the mass of an object related to inertia?
Definition
The more of mass the more inertia or hard to change its motion.
Term
What does Newton’s 1st law say?
Definition
An object are rest will remain at rest and an object in motion will remain in motion at a constant velocity unless acted on by an unbalance force.
Term
What 2 things does the velocity of an object tell you?
Definition
speed and direction
Term
What does Newton's 2nd law explain?
Definition
How acceleration and force and mass are related
Term
Thinking about Newton's law, how are acceleration and force related?
Definition
More acceleration, more force
Term
Newton’s 2nd law shows how acceleration and force are relate, but there is one more variable that needs to be considered. What is it?
Definition
Mass of object
Term
What is the formula for Newton's 2nd law?
Definition
Force = mass X acceleration
Term
What is force measured in?
Definition
Newtons
Term
What does one Newton equal?
Definition
Acceleration on 1 kg at 1 m/sec/sec
Term
How much force is needed to accelerate a 66 kg skier 1 m/sec/sec?
Definition
66 Newtons (F = 66kg * 1 m/sec/sec)
Term
What is the force on a 1000 kg elevator that is falling freely at 9.8 m/sec/sec?
Definition
9800 Newtons (F= 1000 kg * 9.8 m/sec/sec)
Term
What does Newton’s 3rd law of motion say?
Definition
For every reaction, there is an equal and opposite reaction. or every force needs to have an opposite force.
Term
Which Newton's law is shown in the following examples:
1. Astronaut throwing rocket pack in one direction him moving in another
2. birds wing push against air
3. rocket engine gas push in one direction rocket goes in another
Definition
Newton's 3rd Law
Term
What unit is speed measured in?
Definition
Meters per second (m/sec)
Term
What word which means "lazy" did Newton use to describe the fact that objects like to do what they are already doing?
Definition
direction
Term
Net Force is the ________ of all forces acting on an object.
Definition
sum
Term
Drag force acting on a falling object is the same thing as __________________.
Definition
Air resistance
Term
The amount of time needed to go a certain distance refers to the _________ of the object.
Definition
speed