Forces
Forces that are equal on both sides, resulting in a net force of zero and no movement
Balanced Forces
What are the units for time in most of our activities?
Seconds
What is the term for speed in a given direction?
Velocity
The slope of a distance over time graph tells us
An object's speed
An object at rest will stay at rest unless acted upon by an outside force, likewise for an object in motion.
Newton's first law
Forces that are not equal on both sides, resulting in a net force greater than zero and movement in the direction of the greatest force
Unbalanced Forces
What are the units for distance in most of our activities?
Centimeters
What is the term for distance over time?
Speed
Adding mass to the carts increased their
Kinetic Energy
or Speed
Another name for Newton's first law
Law of Inertia
A box is being pushed with 10N right and 5N left. What is the net force?
5N right
What are the units for speed?
meters per second
What is the term for the force that resists motion between objects that are in contact?
Friction
When the marbles left the curved track, they continued:
In a straight line at a constant speed
What is newton's second law?
Force equals mass times acceleration
A man is jumping on a trampoline with 13N pushing down on the trampoline, and 20N pushing back up. What direction will the man go and with how much force?
7N up
What are the units for acceleration?
meters per second per second
or
meters per second squared
What is the term for any change in an object's motion (speed or direction)?
Acceleration
The cart did not move when the buckets on either side had the same mass, meaning the cart was experiencing ___________ forces.
Balanced
What is newton's third law
Every action has an equal and opposite reaction
A woman walks with a stack of books on her head. Her head exerts a force of 5N on the books, and they exert 5N back on her head. She is walking with a force of 3N forward. What is the net force on the books?
3N forward.
What are the units for force?
Newtons
What is the term for force over some distance?
Work
The four examples of Newton's 3rd Law from Activity 11 were:
The rocket
The soccer ball
The rock
The swimmer
What do all of newton's laws describe?
The motion of objects