Momentum, Impulse, Collisions
The units for momentum
kg m/s
The energy conversion from a person jumping on a cliff and landing a on a trampoline
Epg -> Ek -> Eps
Electric field line direction notation + Units for Electric field strength besides
Leaving positive and entering negative + N/C
A
The direction of Magnetic Fields lines + units for magnetic field strength
Leave North and enter South + Tesla
How an airbag keeps you safe in a car crash
What is increasing the time to decrease force?
A hair dryer transforms _______energy to _____ ,________, & ________
electrical to mechanical, sound, and heat
An electron is moved towards a positively charged plate will affect the potential energy in this way
(increase)
A ball has a mass of 2kg and is being thrown at a speed of 10 m/s. What is the ball's Kinetic Energy in Joules?
100 joules
Motor effect vs generator effect
electric --> Mechanical vs Mechanical --> eletrical
A collision where kinetic energy is conserved
What is an elastic collision?
What has a greater impact on Kinetic Energy; mass or speed?
Speed
The force ratio (FBD) during Millikan's oil drop experiment
Electric force = Gravitational Force
If it takes 3.50 MJ of work to move an object across a horizontal surface for a displacement of 6.00 km, what is magnitude of the applied force?
583 N
Direction of e flow? (see picture)
to the right
A 200g electric far is thrust forward from rest until it reaches a speed of 0.750 m/s. What is the impulse felt by the car?
0.1 kg m/s [foward]
Energy that is the SUM of spring, kinetic, and potential energy
Mechanical Energy
Looking at the diagram, what is the direction of the net electric field on q2?
B
Determine the work required by an applied force to accelerate an 800 g cart along a level surface from a speed of 13.0 cm/s to a speed of 25.0 cm/s. Assume no resistive forces.
1.82 x 10−2 J
Which direction will the acceleration of the proton be directed once it enters the field? (see photo)
[up]
A 1575 kg car travelling 10 m/s [right] collides with a stationary car. The bumpers of the car become locked together. The speed of the combined cars immediately after impact is
4.13 kg m/s
The realistic nature of energy conversions
Waste energy will be converted to heat and lost to the envinronment
The electric force between two charges is F. One of the charges is tripled and the distance between them is quartered (x 0.25). What is the new electric force between them?
48 F
A 60.0 kg student falls from a height of 20.0 m. Halfway down (after falling 10.0 m), they grab onto a vertical spring that is fixed at the top and was initially unstretched. The spring has a spring constant of 1800 N/m.
0.653 m
A wire has 9.80x1020 electrons travelling through it in 10.0 seconds. If it is inside of a 37.0 mT perpendicular magnetic field and it experiences a magnetic force of 6.10 x 10-2 N, then determine the length of the wire in the field. Answer in cm.
10.5 cm