Newton's Laws
What is Newton's 1st Law of Motion?
An object in motion stays in motion and an object at rest stays at rest unless acted upon by an outside force.
What is negative acceleration?
deceleration or slowing down
What is a balanced force?
This is the distance something travels in a given amount of time.
A student applied a force of 300 N over 4s to push a box 5m down the sidewalk. How much work was done on the box?
1500J
What is Newton's 2nd Law of Motion?
Force = Mass x Acceleration
Acceleration is a change in _______, or _______ or both.
speed, direction
Explain how weight is a force.
It is a force because it can change easily depending on gravity’s pull on an object’s mass.
Name the six simple machines
What is Newton's Third Law of Motion?
Every action has an equal and opposite reaction.
What does an acceleration of 0 m/s/s mean?
It means there was no change in speed OR direction.
What is the net force in the diagram below?
0N no motion!
Define frame of reference.
A stationary object you use to compare positions.
Calculate the power of a machine that exerted 25N of force over 6 meters in 3 seconds.
50 watts
Give an example of each of Newton's three laws of motion.
Answers can vary.
Calculate the acceleration of a car that goes from 3 mi/hr to 80 mi/hr in 11 seconds.
7 mi/hr/s
What is the net force in the diagram below?
2N left
Calculate the speed of a softball that traveled 70 meters in 8 seconds.
Machines reduce work by changing one of which two things?
The amount of force required, or the distance over which it travels.
Watch the video and explain the experiment using Newton’s Third Law of Motion
The force of the air coming out of the opening of the balloon propels it in the opposite direction.
Calculate the acceleration of a car that slows down to 20 m/s after reaching a speed of 80 m/s in 12 seconds.
-5 m/s/s or -5 m/s2
The diagram shows two arrows that represent the directions of two forces acting on a 4 kg cart.
How should the diagram be labeled if the cart is accelerating to the east at a rate of 2m/s2?
Answers can vary
What is the velocity of a car that traveled 300 miles from New York to Ohio in 10 hours.
30 mi/hr west
How does work input of a machine compare to the work output of a machine?