Units
Unit of Mass
Kg
Definition of Mass
The ammount of matter in an object, or a measure of its inertia
Definition of Equilibrium
A net force of zero on an object
How far will a car travel in 2 seconds if its average speed is 5m/s?
10 M
Units of Weight
N
Definition of weight
ammount of gravitational force on an object, varies with the objects location
Definition of Normal Force
A support force that opposes gravity
What is the hang time of a kangaroo that jumps a vertical distance of 5m while moving forward 5m?
1 sec
Units of Velocity
m/s
Definition of a Rate
How fast a given quantity changes with respect to time
Definition of Friction
A force that opposes motion
We drive for 1 hour at 20 km/h. Then we drive for 1 hour at 40km/h. What is our average speed?
30 kph
Units of acceleration
m/s2
Definition of Inertia
An object’s resistance to change
Definition of Tension
A stretching force
Calculate the instantaneous speed of an object that falls freely for 5 seconds
50 m/s
Units of Force
N
Definition of a Satellite
A projectile that continually “falls” around the earth
Definition of Free Fall
A fall that is free of air resistance and all other forces other than gravity
You kick a soccer ball at an angle of 27°. How far below its initial straight-line path will the ball fall in its first 1 second of flight?
5m