Balanced and Unbalanced
Net Force
Energy Transformation
Speed, Vel., Accel.
Calculating Speed
Motion graphs
Average speed from graphs
Potential and Kinetic Energy
100
Is this balanced or unbalanced?
Unbalanced
It will move left
100
Would you add or subtract the forces to find the net force in this diagram?
Subtract
because they are going in opposite directions
100
Bobby eats a sandwich and then runs a mile. What energy transformations occurred?
Chemical to Mechanical
(digestion is chemical and the energy is used to move your body which would be kinetic/Mechanical)
100
The following are units of measurement for ______
Mph
m/s
km/h
Speed
100
What is the formula for speed?
distance / time
100
What does this graph show? Substitute distance for speed on the y-axis.
Constant Speed
100
What is the average speed of this graph?
2 miles/min
100
What type of energy is potential and kinetic energy?
(think MRS. CHEN)
Mechanical Energy
200
Is this balanced or unbalanced?
(The size of the arrows represents the magnitude of the force)
Balanced
(Will not move because the arrows are of equal size)
200
Would you add or subtract the forces in this diagram to find the net force?
Add
Because they are both going in the same direction (Left)
200
A lamp was plugged into the wall and produced a bright light. What energy transformation occurred?
Electrical to Radiant (light)
200
What is velocity?
Speed with direction
200
A woman ran 16km in 2 hours. What was her speed?
8 km/h
16km / 2hr = 8 km/h
200
What does this graph show? Substitute distance for velocity on the y-axis.
Stopped (no motion)
200
What is the average speed at 5 hours?
0.4 mph
After = At
Distance/time = speed
2/5= 0.4m/s
200
Potential energy is determined by mass and _____
Position
300
Is this balanced or unbalanced?
(the size of the arrow represents the magnitude of the force applied)
Unbalanced
(object will move down in the direction of the greater force applied)
300
What is the net force and direction of the box?
0N and it will not move
(balanced)
300
Solar panels are being used to power a home. What energy transformations occurred?
Radiant to Electrical
300
True or false
A plane flying 5m West is an example of velocity
False
It would have to be 5m/s West for it to be velocity. 5m is not speed. Velocity must be speed and direction
300
A man ran 3km in 30 minutes. How fast was he traveling in km/min?
0.1 km/min
3km divided by 30 min = 0.1 km/min
300
Which segment represents no motion? Substitute distance for speed on the y-axis.
A-B, C-D, E-F
300
What is the average speed at 4s?
2m/s
Average speed is total distance/total time
8m/4s = 2m/s
300
Kinetic energy is determined by mass and _____
Speed
400
Is this balanced or unbalanced?
(size of the arrow represents the magnitude of the for applied)
Unbalanced
(object will move left because that is the direction that the greater force is being applied)
400
What is the net force of this box and which direction will it move?
40 N to the Right
(In the direction of the force applied)
400
Any energy transformations that involve splitting atoms will result in what type of energy?
Nuclear Energy
400
True or False
In order to accelerate you have to be either speeding up or slowing down (changing speed) only
False
Acceleration is changing speed OR direction. A car traveling at a constant speed will be accelerating when it turns
400
it took a car 30 minutes to travel a distance of 40 km. At what speed was the car traveling?
1.3km/min
40km / 30min = 1.3 km/min
400
Describe the motion at each point on the graph. Pay attention because this is an 8th grade question.
A - constant speed
B - decelerating
C - slower constant speed
400
What is the average speed at 1s?
10 m/s
Distance/time = speed
10m / 1s = 10m/s
400
Which point has the highest potential energy?
A
500
Is this balanced or unbalanced?
(size of the arrow represents that magnitude of the force applied)
Unbalanced
(object will move right because that is the direction that the greater force is being applied)
500
What is the net force of the plane and which direction will it move?
15 N and the plane will move left
(in the direction that the greater force is applied)
500
What does the MRS. CENT acronym stand for?
Mechanical, Radiant, Sound, Chemical, Electrical, Nuclear, Thermal
500
True or False
If the blue car and red car are both traveling at a constant speed of 50 mph, that means they have the same speed and the same velocity
False
They are going in opposite directions so their speed is the same but velocity will be different
500
A bike rider traveled 11.25 km in 2 hours and 15 minutes. At what speed was he traveling in km/h?
5 km/h
convert minutes into hours. 11.25km/2.25hr = 5km/h
500
Describe the motion at each point of this graph. Be careful with this one because it is an 8th grade question.
A - Stopped (0m/s)
B - Accelerating
C - Decelerating
D - Stopped again (0m/s)
500
What is the average speed at 5s?
8 m/s
Distance/time = speed
40m / 5s = 8m/s
500
Which point has the highest kinetic energy?
B