Speed and Newtons Laws Flashcards
What is inertia?
Inertia is the tendency of an object to resist a change in motion.
* more mass = more inertia *
What is the definition of Newton’s first law?
An object in motion will stay in motion, an object at rest will stay at rest unless acted on by an outside force.
What is the definition of Newton’s second law?
Acceleration depends upon the objects mass and force acting on the object.
F=mass times acceleration.
What is the speed formula?
Speed= distance/time
What is the formula for distance?
Distance= speed times time.
What is velocity?
A speed in a given direction.
What is the definition of acceleration?
Is the rate at which velocity changes.
What are three ways acceleration changes?
- Increasing speed
- Decreasing speed
- Changing direction
What is force?
Force is a push or a pull.
• It is described by its strength and the direction in which it acts.
What is friction?
Friction is the force that two surfaces exert on each other when they rub against each other.
What is the formula for time?
Time= distance/ speed
What is gravity?
Gravity is a force that pulls objects towards each other.
What is the law of universal gravitation?
It states that the force of gravity acts between all objects in the universe.
What are two factors that affect the gravitational attraction between objects?
- Mass of the object.
2. Distance between the object.
How does mass affect the gravitational force?
• The more mass an object has, the greater the gravitational force.
Ex: weight on a scale
How does distance affect the gravitational force?
• The farther apart two objects are, the less the gravitational force.
Ex: Astronaut in space
What causes a leaf to fall more slowly than an acorn?
Air resistance!
Why do all objects fall at the same rate?
Gravity!
What is the formula you use to find force, mass, and acceleration?
- remember the triangle! :)
Force= mass times acceleration Mass= force/ acceleration Acceleration= force/ mass
What is the SI unit for acceleration?
Meters per second per second.
M/s^s
What is an example of force?
An example of force is if you push on a door you exert a force in a different direction then if you pull on the door.
What is the SI unit for force?
The Newton. (N)
What is an example of friction?
An example of friction is rubbing your hands together.
What is an example of gravity?
An example of gravity is the solar system.
What is the definition of newtons third law.
For every action there is an equal and opposite reaction.
•Equal force, opposite direction.
What is an example of Newton’s third law?
Shooting a gun and a rocket blasting off.
