Force
What is a force?
a push or pull
Name the Newton's law:
For every action, there is an equal and opposite reaction
3rd Law
How would you describe the movement of an object when the forces are balanced?
Still or no movement
To determine the speed of an object, you need to what two things?
time and distance
There are two forces acting on a box. One force is pulling it 25 Newtons to the right, and the other force is pulling it 17 Newtons to the left. What is the net force?
8 Newtons to the right
What is force measured in?
Newtons
Name Newton's Law:
An object at rest will stay at rest and an object in motion will stay in motion
1st
What can be measured if you know the distance an object traveled and the amount of time it traveled?
Speed
Show what the line on a distance time graph would look like if an object was increasing in speed.
Line would be curving upward.
What does the horizontal axis on a distance time graph represent?
Time
Name a force that slows or stops motion
Friction
Name Newton's Law: An object accelerates when a force acts upon an object with mass
2nd
What causes an object to move?
unbalanced forces
A car travels 60 meters in 5 seconds. What is the car's speed?
12m/s
What does the vertical axis on a distance time graph represent?
Distance
What force causes rain drops to fall from the sky?
gravity
Which of Newton's Laws describes what happens during a car accident?
1st
What type of force is friction?
contact force
A girl rides her bike down a hill at constant speed. What changes about the girl on her bike as it goes down the hill?
a. speed
b. position
c. direction
B
What characteristic of a surface will have the greatest impact on fraction?
a. Temperature of surface
b. hardness of surface
c. smoothness of surface.
C
How can you reduce friction between objects rubbing together?
Use a liquid or lubricant
Which of Newton's laws describes what happens when you are leaning against a wall?
3rd
What is the difference between weight and mass?
Mass always stays the same but weight depends on gravitational pull.
If you run for 50 minutes and you notice that you went farther the first 25 minutes than in the second 25 minutes, what can you conclude about your run?
Your average speed was faster during the first half of your run.
A person walks to the comic book store, stays for 15 minutes, and then walks back home. What would the line of motion look like on a distance time graph?
Constant motion up for the walking to the store, horizontal when at the store, constant motion down when walking home.