Author: Paulding Co School District

Force, Motion, & Simple Machines Study Guide
S8P3
S8P3a velocity and acceleration
1. Define
Distance
Displacement
Speed
Velocity
Acceleration
2. Draw a speed limit sign. How is it a clue to the formula for speed and velocity? Why is it a speed limit sign and not a velocity limit sign?
3. What are the formulas for the following (state the units as well):
Speed or Velocity
Acceleration
4. Listed below are several numbers and units. Which variable are they?
12 m 100 km/hr 14 mi, West
+2 m/s2 12.5 cm 2.5 m/s, up
5. Consider the runners and answers the questions beside each figure.
R1’s Distance? R2’s Speed?
R1’s Displacement? R2’s Velocity?
R3’s Speed?
R3’s Velocity?
The track is 100 meters long and it takes the runner
6 minutes to do four laps from start to finish.
R4’s Distance?
R4’s Displacement?
R4’s Speed?
R4’s Velocity? (This last question is a problem/a trick. Why?)

4 km/hr

3 km

Stop

1 km

3 km

10 km/hr

Start

Start/Stop

6. Consider the drawing. The ball at the end of the rope is moving at a constant motion.
Is it’s velocity changing?
Is it’s speed changing?
Is it’s acceleration changing?
7. Please give the answer to these two problems, including units of course.
A car travels 200 miles in four hours. How fast is it traveling?
A car that had been stopped at a stop sign, begins to move at 25 m/s in 5 seconds. What is its
acceleration?
8. Consider the paths below. What motion do they show?
Path 1:
Path 2:
Path 3:
9. Below each graph, describe the motion shown.
10. Draw the graph requested.
Someone starts off away from After traveling at a constant
home but stops off at a friends speed for a while, a driver
before going all the way home. speeds up.

CV

CV

CV

CV

CV

CV

CV

CV

d

v

v

d

a

t

t

t

t

t

d

v

t

t

CV

CV

CV

S8P3b Force
11. Define
Force Gravity
Balanced Force Inertia
Unbalanced Force Friction
12. Look at the following diagrams. What is the Net Force? (Note: these force are ______________ forces.)
13. Look at the following diagrams. What is the Net Force? (Note: These forces are ______________ forces.)
14. The objects in question 13 are said to have _________. Explain this idea and how it relates to their motion.
15. What is the formula for force and what are the two possible units for force?
16. What are different types of forces and in which direction do they act? (The F sub “something” forces.)
17. What force opposes motion? _________________.
18. To be sure:
Weight is a(n) ____________. The SI unit for weight is _________.
Gravity is a(n) ____________. The SI unit for gravity is _________.
19. An object has a mass of 20 kg. List its mass in each place. Note the altitude and stated gravity.
20. Where would the weight be most and least on earth? On which solar body would the weight be the most? Least?

100 N

200 N

50 N

100 N

75 N

25 N

300 N

100 N

100 N

50 N

50 N

100 N

75 N

75 N

100 N

Moon 1.6 m/s2

Earth 9.8 m/s2

Neptune 11.6 m/s2

21. Explain and show how a satellite stays in orbit.
S8P3c Work and Simple Machines
22. Explain Work. Give the formula and units.
23. When working with machines, which is true? Explain why the other two are incorrect.
WI < WO
WI = WO
WI > WO
24. What are the two types of simple machines? ________________ and _________________.
25. Draw all six machines. Give their name and show WI and WO by showing displacement and force vectors.
26. In what two distinct ways can machines make work easier?
1.
2.
27. We discuss making work “easier” not “less.” Why—include a force? (Yes, I am re-asking question 23.)
28. Most machines are made up of more than one machine. These are called _______________ machines.
29. What simple machines are used to create these objects.
30. What is the relationship between Work and Power?