Vocabulary
A group of objects from which a position in motion is measured.
Frame of Reference
What is an example of friction in the classroom
A collection of forces acting on an object that cancel each other out and produce no change in the objects motion
Balanced Forces
What is Newton's First Law of Motion?
An object at rest tends to stay at rest, and an object in constant motion tends to stay in motion, unless acted upon by an unbalanced force.
10 mph/second is an example of.........
acceleration
This is an example of.....
34 mph north
Velocity
Provide 2 examples of friction that occur in your everyday life.
Sample Answer (answers may vary):
1. My shoes and the sidewalk
2. My car's wheels and the road
3. My pencil writing in my notebook
What forces are being applied to the swings out on the playground? (hint their are 2)
Pull form the chains and gravity
True or False
According to Newton's third law of motion forces always act in pairs.
True
For every action, there is an equal and opposite reaction"
Why is velocity more important than speed when traveling?
You need to know BOTH the speed to get to your destination as well as the direction in which to go to arrive at your destination.
What is the definition of Inertia?
The natural tendency of objects in motion to stay in motion and objects at rest to stay at rest, unless acted upon by a force
answers may vary
Provide one example of friction being helpful .
Sample Answer (answers may vary):
Helpful - Friction between shoes and the floor help to stop us from slipping.
Ms. Peterson and Ms. Hecht are playing tug of war. If Ms. Peterson is pulling with 10.01 N and Ms. Hecht is pulling with 10.10 N. Who is going to win tug of war? Why?
Ms. Hecht because 10.10 N of force is greater then 10.01 N.
What is Newton's Third Law of Motion?
All forces occur in pairs, and these two forces are equal in strength and opposite in direction.
Write the "Fantastic Four" ways to change an objects motion.
1. Change an object's speed
2. Make an object move
3. Stop an object
4. Change the direction of an object
A force that opposes motion
friction
Provide one example of friction being harmful.
Harmful - Wear and tear on our shoes due to friction ultimately causes them to fall apart and develop holes.
I am playing tug-of-war against Walter. I am pulling with 10N of force. Walter is pulling with 5N of force. Are these forces balanced or unbalanced?
Unbalanced (I am pulling with MORE force than Walter, which will cause motion)
According to Newton's First Law of Motion, objects in motion will stay in motion unless acted upon by an external force. What would happen if there were no external forces (i.e. no friction, no drag, no gravity)?
You would continue in motion forever (Think: SPACE!)
What is an example of work?
moving a box, lifting a box from the ground
answers will vary
What is the definition of momentum?
mass x acceleration
answers may vary
How could you decrease the amount of friction in a car engine?
add a lubricants like oil or grease
A collection of forces acting on an object that result in a change in the object's motion
Unbalanced Forces
What is Newton's Second Law of Motion?
The unbalanced force on an object is equal to the mass of the object multiplied by its acceleration (F = m x a)
Which of these is an example of force?
A. Taking cookies out of the oven
B. Watching a pancake cook on the stove
C. Listening to your favorite song
D. Bird Watching
A. Taking cookies out of the oven