Units
General unit for distance
Meter
Kilometer
Centimeter
Millimeter
A push or pull acting on an object
Force
When an object is not changing its motion its net force is . . .
Zero
How can we change the speed that an object orbits another object?
We can change the mass of one of the objects
We can change the distance between the objects
We can change the object's velocity
If feathers and a hammer were dropped at the same time from the same height in a vacuum chamber which would hit the ground first?
They would hit at the same time
General unit for acceleration
Meter/second2
Force when there is a physical contact between two objects
Applied force
The force between your sock feet and a slippery floor when you slip
Sliding friction
What force is acting on the moon?
Gravity
Why do objects fall at different speeds if gravity accelerates all objects at the same rate?
Air resistance
General unit for mass
Gram
Kilogram
This changes an object's speed or direction
Force or Acceleration
A ball flying through the air slows due to this type of friction
fluid friction
What about orbit keeps the moon from hitting earth?
It has horizontal Velocity
About how fast will a cannonball be moving if it fell for 3 seconds in a vacuum chamber?
30 m/s
General unit for force
newton
This causes accelerations
Force
This force is used in springs
Elastic force
A cannon ball shot out of a cannon horizontally and a cannon ball dropped from the same height will hit the ground at the same time because . . .
Gravity is acting the same on both cannon balls equally
Earth has a mass of 5.97 x 1024 kilograms while Mars has a mass of 6.39 × 1023 kilograms. Where would you weigh more?
Earth
General Unit for weight
Newton
This happens when an object is falling toward another object but does not make contact with the ground due to gravity.
Orbit or Orbital motion
This force opposes motion between any surface that is touching.
Friction
Earth has a mass of 5.97 x 1024 kilograms while Mars has a mass of 6.39 × 1023 kilograms. Which has a stronger gravitational force?
Earth
Earth has a mass of 5.97 x 1024 kilograms while Mars has a mass of 6.39 × 1023 kilograms. Where would you have less mass?
Mass stays the same