Newton's Laws
Please explain Newton's 1st Law
The Law of Inertia - an object at rest will stay at rest unless acted upon by an outside force, an object in motion will stay in motion unless acted upon by an outside force.
Please provide 3 examples of units that may be used to model speed.
m/s; mph; km/hr
Which of the following are proper measurement units for acceleration? Please identify all.
m/s2 ; m/s/s; mph; km/hr2 ; s ; mph North ; mi/hr2
m/s2 ; m/s/s; km/hr2 ; mi/hr2
A horizontal line on a motion graph that's y axis is distance and its x axis is time indicates what type of movement?
No movement - the object is stationary
True or False: Mass and Weight are the same measurement? Explain
False; Mass is the amount of matter that makes up and object and weight is a measurement of the gravitational force acting on the object exerted by another object (i.e. Earth)
Please explain the following formula as it relates to Newton's 2nd Law: F = M x A
Force = Mass x Acceleration
It takes a larger force to accelerate a more massive object. A larger force will accelerate an objects mass faster.
Please explain the difference between speed and velocity.
What is the acceleration of a motorcycle moving on a straight path when the speed goes from 0 mph to 70 mph in 5 seconds? Include the unit in your answer.
Acceleration = (final velocity - initial velocity) / time
14 mi/hr/s
A steep positive slope on a graph that's y-axis is distance and x-axis is time indicates what kind of movement for the object?
Traveling at a high speed.
A rocket's ability to launch into space and achieve escape velocity is due to a combination of forces between the rocket and the Earth; what are the 2 forces and which of Newton's Laws does this model.
The Rocket Engine Exhaust on Earth's Surface and the Earth's surface back on the Exhaust & Rocket - Newton's 3rd Law.
Every Action has an equal and opposite reaction (force) = Bocce Ball, Pool, Bowling, etc - answers will vary but must be explained.
Solve the Following Word Problem:
Speed = Distance/Time (you may need use a different formula to solve)
Arnold traveled for 14 mph for 3 hours.
Brian drove for 8 hours at 15 mph.
Leslie drove 100 miles in 4 hours.
Which one drove the fastest and how do you know?
Leslie was traveling at 25 mph. If you divide 100 miles by 4 hours it calculates Leslie traveling at 25 mph.
A bunny runs away from a fox at 4 m/s but ends up running 10 m/s after 10 seconds; how fast did it accelerate?
Acceleration = (final velocity - initial velocity) / time
0.6 m/s2
What does the origin or (0,0) represent on a motion graph?
The starting point or the point of reference for all motion.
In a moving vehicle traveling at high speeds; if suddently stopped without a seatbelt, free objects would continue their motion at the high speed. A seatbelt serves as a resistive force to protect the dummy by preventing interia from throwing the dummy out of the vehicle.
Please explain how the Law of Inertia explains planetary movement?
Because objects are moving at a speed that outpaces the gravitational pull of the sun or other planets, things like moons, satellites, and the ISS can remain in Orbit due to their consistent motion.
Solve the Following Word Problem:
A bus travels with a constant speed of 48 km/h. How long will it take to travel 60 km?
1.25 hours
A pilot decreases the landing speed from 70 m/s to 7 m/s in 30 seconds. What was the acceleration of the plane with the proper units?
Acceleration = (final velocity - initial velocity) / time
-2.1 m/s2 - it's a negative acceleration because the plane is slowing down or decelerating.
Draw me a line graph that represents the following story on a graph where the y-axis is speed and the x-axis is time. "Tom the turkey hates to exercise but wants to avoid becoming Thanksgiving Dinner. He has decided to start jogging. He begins his run out his front door from a stop and quickening to a 4 m/s speed. He maintains this speed for the first half of his run, until a hungry wolf jogs past. Fearing becoming dinner, Tom increases his speed to a 18 m/s pace which is much faster than Tom has ever run. After a few minutes at this elevated pace, Tom looses his footing and trips. He quickly slows his pace down from 18 m/s to 0 m/s as he lies on the ground; no more jogging for Tom.
Answers will vary.
Acceleration = (final velocity - initial velocity) / time75
-340 km/hr2
Caroline uses 20 N of force to move a box of books 15 m. How much work did she do? (Work Unit = Joules)
Work = Force x Distance
300 Joules
On a graph where the y-axis is distance and the x-axis is time, how could you identify a time of constant speed?
Anywhere there is a straigh lines positive slope.
You can speed up from 0 to 25 feet/s in 25 seconds and your brother can speed up from 0 to 6 feet/s in 6 seconds.
Who has the fastest acceleration? What is it in the correct unit?
Acceleration = (final velocity - initial velocity) / time
They have the same acceleration 1 ft/s2
A race car is driving forward with a force of 35 Newtons, its parachute is deployed with a resistive force of 15 Newtons and the track provides an additional oppositional force of 15 Newtons. Is that enough to stop the race car's motion?
No, the Net Force of the race car would still be 5 Newtons in the forward direction.
Which set of measurements correctly calculates the speed of an object?
Speed = Distance / Time
Distance = 2 km Time = 24 sec Speed = 48 km/sec
Distance = 18 m Time = 2 hr Speed = 9 m/hr
Distance = 3 cm Time = 12 min Speed = 36 cm/min
Distance = 109 m Time = 9 min Speed = 13.6 m/min
Distance = 30 km Time = 17 min Speed = 1.8 km/min
Distance = 18 m Time = 2 hr Speed = 9 m/hr
Distance = 30 km Time = 17 min Speed = 1.8 km/min