Metric and mechanics
250 cm converted to m
2.5 m
What is Energy measured in?
Joule, what other physics quanity uses this unit?
Draw a neutral electroscope when a positively charged rob is brought near but not touching.
The electroscope should have neg charges on the ball and positive on the leaves and the leaves are separated.
Name the directions transverse and longitudinal waves propogate.
Transverse: perpendicular
Logitudianl: parallel
Draw them!
What is the difference between a scalar quantity and a vector one?
Scalar: no direction needed
Vector: direction needed
Name two examples of each
Scalar, mass, speed, distance...
Vector: acceleration, velocity, force (weight)
When a vehicle is starts from rest and accelerates to a velcity of 40m/s, in 10 seconds, what is the acceleration?
4 m/s^2
Where is the greatest potential and the greatest kinetic energy of a pendulum?
Potential at the top of the swing, Kinetic and the bottom middle
Draw the magnetic domains seen inside a magnet
They should be arrows aligned
Which is a mechanical wave: Sound or light
and what way the particles travel compared to the movement.
Sound: longitudinal and paralell
What happens when you add work to a system?
It increases the total energy
Find the force of friction of a 1000 kg compact car and the road when the car is already in motion
6700 N
If a 10kg object is moving at 4 m/s What is the momemtum
40 kg m/s
Sketch the graph of the electrostatic force and the distance between the objects.
Indirect relationship with a curve
Draw a standing wave with at least 2 wavelengths and label the nodes and the antinodes (transverse)
nodes should be at the line, antinodes should be where there is amplitude.
A 20N Force is applied to a cart at a 30 degree angle. What is the force in the horizontal direction?
17.3 N
Find the acceleration of an object when the applied force is 10 N and the frictional force is 2 N and with a mass of 10kg.
.8 m/s^2
What is the work on an 20N object moving a distance of 3 meters in the same direction
60 J
a 240V line draws a current of 30 amps for 1200 seconds, how much electrical energy is used.
8600000 J
What characteristic of light remains the same when it is refracted at boundaries?
Frequency
position vs time should be a direct relationship
velocity vs time is a straight line above zero
acceleration is a straight line at zero
What is the coefficeient of friction between 780 N crate with a 156 N friction force.
.200
find the potential energy a roller coaster started with, when the kinetic energy at the maximum speed is 250 Joules. Neglect friction.
250 J. Where does all energy go to die?
What is the current when 25 C of charge pass a point in 2.5 seconds
10 A
Baryons. What are they made of?
Name three things that are always conserved in Physics
mass, energy, momentum, charge