Physics and of unit test review Flashcards
What is the formula for net force
mass x acceleration
What is the formula for mass
Force ÷ acceleration
What is the formula for acceleration
Force ÷ mass
Balanced forces are equal in ____ and _____
Balanced forces are equal in force and size
Speed and direction which the object is moving is the definition of what?
Velocity
What is a change in speed or direction over time?
Acceleration
Acceleration unit?
Always squared
If you have 10 newtons to right and 4 to left what is net force/
6 N to the left
If you have 10 newtons right and 4 right what is net force?
16 to the right
There is 30 N force applied to a car. Of the force decreases what happens to the speed?
Decreases
There is 30N force applies to a car. If the force increases what will happen to the speed?
Increases
Example of a change in velocity
Making a turn around a mountain
How much force is needed to accelerate a 10 kg ball to a rate of 2m/s^2
20 N (F = mass x acceleration
What is kinetic energy?
Energy in motion, actively using energy for movement.
An object in motion will stay in motion. What is this?
Inertia
What is speed
The rate of change of position of an object in any direction.
How is speed calculated
Speed = distance ÷ time
How does friction affect forces in motion
It slows them down and eventually makes them come to a stop.
What is acceleration
Increase or decrease in the rate or speed of something.Acceleration is also something that stays at a constant speed
What is Newton’s first law?
And object at rest stays at rest or an object in motion stays in motion until an unbalanced force act upon psi it.
What is Newton’s second law?
The acceleration of an object depends on the objects mass and the magnitude of the force acting upon it.
What is Newton’s third law?
For action there is an equal and opposite reaction.
What unit is energy measured in?
Joule (J) - how much energy is needed for change within a system
What is potential energy?
Energy that is stored in a system
