Forces and Motion
What is a force?
a push or pull on an object
This is what holds all things together in the Univers
What is Gravity?
what is the definition of free fall?
An object in motion where the only force acting on it is gravity
What are the two types of projectile motion?
horizontal and launched at an angle
What form of energy is light?
What is the equation for force?
Force = Mass x Acceleration
This describes a measurement of how much matter is in an object...
what is mass?
is a sky diver technically in freefall?
no, air resistance is opposing gravity
What law does the vertical aspect of a projectile follow?
The laws of gravity
What are the two types of mechanical energy?
potential and kinetic
What is newtons first law?
an object in motion stays in motion, object at rest stays at rest, unless acted on by outside AND unbalanced forces.
This measurement describes how mass is affected by gravity
What is weight?
at what rate does gravity accelerate an object back towards earth?
9.8 m/s2
What law does the horizontal aspect of a projectile follow? (sticker if you can also tell me the definition of this law)
Newtons 1st law
What two factors affect an objects potential energy?
height and mass
If two opposing forces on an object are balanced, what is that object doing?
it is at rest
What factor will increase a planets gravitational pull?
the mass of the planet
For an object in Freefall, what stays constant and what changes between velocity and acceleration?
acceleration remains constant while velocity changes
This type of velocity does not change through out a projectiles motion
Horizontal velocity
What two factors affect an objects kinetic energy?
velocity and mass
What is the difference between velocity and acceleration?
Velocity is the distance an object travels in an amount of time. Acceleration is a change in velocity over time.
Is there gravity in space? Why or Why not?
Yes. the greater the distance between to objects, the less gravitational pull. but the gravitational pull is never zero.
Assume the gravitational pull on earth is 10 m/s2, What would be the final velocity of a ball in freefall for 5 seconds? (assume there is no air resistance)
50 m/s
Assuming all projectiles are launched with the same amount of force, what would be the optimal angle for maximum distance?
45o
Energy transfer is when energy is transfered from one object to another or one place to another. energy transformation is when one of energy is converted into another form of energy.