1. Safety, Speed, & Velocity Test Review

2. Draw and label a picture of balanced forces, and calculate the net force for your drawing.

3. 2) Draw and label a picture of unbalanced forces, and calculate the net force for your drawing

4. 3) in the drawings below, calculate the net force and identify the direction/type of motion.
unbalanced force 30 N
12N to right
18 N
What would happen if you increased
the left pushing force by20N?
The object would then move to the left!

5. 4) Write a definition and the formula for Speed
speed is the distance an object
moves over a period of time
s = d/t

6. 5) Write a definition and an example for Velocity
Velocity is speed with direction.
For example:
Mrs. Norton is driving her
Lamborghini 135 mi/hr North

7. 6) What is the difference between speed and velocity?
Speed is how fast the object is
moving.
Velocity adds direction to speed.

8. Acceleration is a change of velocity.
7) What is acceleration? What are the three “types” of acceleration (& give an example of each)? What causes and object to accelerate?
Acceleration is a change of velocity.
The three types of acceleration are –
speeding up, slowing down & changing directions
An objects accelerates due to unbalanced forces

9. 8) Draw a graph for the following scenarios: - A person running fast
- A person walking
- A person that is standing still
- A person running that stops for a water break.
STANDING STILL D I S T A N C E
RUN FAST – THEN STOP FOR WATER BREAK
RUNNING FAST
WALKING
TIME

10. 9) Explain the speed graph to the right.
A. Who ran fastest? Albert Slowest? Charlie
B. Who stopped (and at what time)? Charlie (8-13sec)
How fast was Charlie going in the first eight seconds?
s = d/t = 50m/8sec = 6.25
D. Who made it to the 20m point first? Charlie
E. How far was the race? 100m

11. 10) Describe what is happening at each
segment in the graph below:
A: moving away faster
B: moving away slower
C: standing still
D: moving “home”
towards zero

12. 11) Jeremy watches a storm cloud on a weather map
11) Jeremy watches a storm cloud on a weather map. The storm cell moved 15 Km in half an hour. What is the storm's speed in Km/hr?
s = d/t
s = 15 Km/.5 hour
Answer = 30 Km/hr

13. 12) Isabella is driving her Lamborghini on I-45, heading north
12) Isabella is driving her Lamborghini on I-45, heading north. She drove the 112 Km to Huntsville in 1.3 hrs. What is Isabella’s speed in Km/hr?
s = d/t
s = 112 Km/1.3 hour
Answer = Km/hr

14. 13) For a science experiment, Mady rolls a metal ball down a 1-meter ramp. The ball takes 0.26 seconds to go down the ramp. What was the ball's speed in m/s?
s = d/t
s = 1 m/0.26 sec
Answer = 3.85 m/s