free body diagrams
What happens to a object when acted upon by an unbalanced force
acceleration
A collision in which kinetic energy is conserved is called a
completely elastic collision
If one light bulb in a circuit goes out and all lights go out the circuit must be in which configuration
series
This force is always opposite to direction of motion
friction
What is the difference between distance and displacement?
distance is total length of path a body covers during motion.
Displacement is change in position of a body during motion.
Draw a free body diagram of a football that has been thrown and is at the top of its arc.
(box with arrow pointing down for gravity)
What happens to the speed of a point on a rotating object the father you are from the axis of rotation
speed increases
The formula V = I x R comes from this law
Ohm's Law
Why is it harder to open a door if you push near the hinges?
What force(s) are acting on a satellite in orbit?
gravity only
What is the difference between speed and velocity
velocity is a vector (it contains a direction)
What has more kinetic energy? A 10 kg ball travelling at 2 m/s or a 1 kg ball moving at 7 m/s.
1kg ball (24.5 J vs. 20 J)
In a parallel circuit what happens to current between multiple components on the circuit
It is shared
A ball rolling on the ground experiences what kind of friction
static friction (only one part of the ball touches on part of the ground at a time)
If a force of 40 N is put on a block that weights 10 kg what will be its acceleration?
4m/s/s
Draw a free body diagram of a person who is in an elevator that is descending and slowing to a stop
line going down, larger line going up
If a 4kg moving 5m/s collides with a 1kg ball that is not moving (in a completely elastic collision). What will be the resulting speed of the 1kg ball
10 m/s
What is the current of a circuit with 9 Volts and 3 kilo ohms?
3 amps
If a bucket is being spun horizontally at uniform speed which direction is the acceleration happening
to the axis of rotation
This is the term for a property of matter that causes it to remain at rest or in a state of uniform motion
inertia
Draw a free body diagram of a car accelerating down a 30 degree downward slope (consider air resistance and friction)
Gravity arrow straight down
Normal force out from surface (30 from vertical)
Friction and air resistance facing up the slope
downhill force can be found be adding normal and gravity vectors
If a car moving at 4 m/s (left) and weighing 5kg collides with a car moving at 2 m/s (right) and weighing 4 kg in a COMPLETELY INELASTIC collision. What will be the resulting velocity of the cars
2.66 m/s left
What is the voltage of circuit with a current of 10 Amps and 5kOhms?
50 Volts
What is the average velocity of a bucket spinning at a constant velocity over 10 revolutions?
0 m/s
when you turn off lights with a switch, what are you doing to the circuit?
opening it