Force and Motion
What is the SI unit for distance?
What is a meter?
What is a free body diagram used to show?
What are all the forces acting on an object; represents the motion
What is net force?
What is the total of all forces acting on an object?
What does friction oppose?
What is motion?
An object travels 10 meters in 5 seconds. What is the average speed of the object?
2 m/s
Which variable is changed on purpose in an experiment?
What is the independent variable?
If an object’s speed changes, what is happening to its motion?
What is acceleration?
In a free body diagram, arrows represent what two things?
What are force direction and relative strength (magnitude)?
If two equal forces push in opposite directions, what is the net force?
What is 0 newtons?
An object is pushed with the same amount of force and for the same amount of time on a surface with a lot of friction compared to a surface with a little bit of friction. Which surface causes the object to have a greater acceleration?
The surface with a little bit of friction
What is the formula for average speed?
What is total distance ÷ total time?
Which variable is measured or observed?
What is the dependent variable?
A soccer ball is kicked and starts moving from rest. Which force caused the change in motion?
What is an applied force?
Which vector always points downward in a free body diagram near Earth’s surface?
What is weight?
A 10 N force pushes right and a 4 N force pushes left. What is the net force?
What is 6 N to the right?
What happens to friction when the force pushing two surfaces together increases?
What is friction increases?
What is the SI unit for average speed?
What is meters per second?
When these variables don't change, it makes the data collected in an experiment more likely to be valid and less biased.
What is the controlled variables?
An object moves at a constant speed in a straight line. What can you conclude about the forces acting on it?
What is the net force is zero (balanced forces)?
***WHITE BOARD CHALLENGE***
Use a dry erase marker and erasure. On the white board, draw a free body diagram of a soccer ball decelerating on the grass. Label your vectors.
Checklist
- made a box- Vectors start in center of box - Normal and gravity are equal and opposite w parallel lines - Friction is greater than applied force
What happens to an object when the net force is not zero?
What is the object accelerates?
Why do car tires have tread, the raised grooved pattern?
What is to increase friction with the road?
If the distance stays the same but time increases, what happens to average speed?
What is average speed decreases?
In an experiment testing how surface type affects friction, name one controlled variable.
What is mass of the object / applied force / distance traveled? (any valid)
A skateboarder slows down on a flat surface after being pushed. Which force is increases?
What is friction?
An object is at rest on a table. Which two vertical forces must be equal in size?
What are gravitational force and normal force?
An object is speeding up while moving right. What must be true about the direction of the net force?
What is the net force is to the right?
An object moves at constant speed across a surface. How do vectors for friction and applied force compare?
What is they are equal in size and opposite in direction?
A car travels 60 km in 1 hour and then 60 km in 2 hours. Is its average speed for the whole trip closer to 30 km/h or 60 km/h?
What is closer to 30 km/h?
***CHALLENGE***
Use a dry-erase marker on the whiteboard to create a data table for the following testable research question: When a ball is pushed with an applied force of 40N, will there be a significant difference in the distance the ball travels on grass compared to the classroom floor?
Checklist
3 columns with headings - trial, distance traveled classroom floor, distance traveled grass
7 rows - headings, 5 trials, averages*
This term states an object just wants to keep doing what it's doing,
What is inertia?
***CHALLENGE***
A medium size apple is placed in your hand. Approximately, how many Newton's of force does a medium sized apple apply downward?
What is 1 N?
***CHALLENGE***
Use a dry erase marker on the white board to complete the following: Draw a free body diagram with labeled vectors of a skydiver who is falling straight down toward Earth at a constant speed due to being attached to the parachute.
Checklist
- Draw a box
- Downward force is weight and equal in size to tension, the opposite force. (Parallel lines are drawn and vectors start in the center of the box)
***CHALLENGE***
Use a dry erase marker on the whiteboard for this. Draw a free body diagram of a stationary box that is sitting on the ground on a hill. Label the 4 vectors.
Checklist
- Drew a square that shows in its on an incline - Vectors starts in the center - the normal force and gravity and equal in size with gravity pointing straight down, and normal is perpendular to surface - weight is parallel (Downward) and opposite static friction (upward)
***CALCULATOR NEEDED***
A dog walks 300 m in 20 min to get to the dog park, stops to rest for 3 min, and then runs around for a distance of 700 m for 22 min. What is the dog's average speed?
What is 22.2 m/min
What are the three components required in a testable research question?
Will there be a significant difference...
What is being measured (DV)
What is being compared (IV)