# Shared Flashcard Set

## Details

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

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
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 another2. birds wing push against air3. 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
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