Formulas:

For each formula below, fill in the missing variable.

Answer to Previous Question:

About 25 Newtons to the southwest.

Speed & Acceleration:

In the examples below, calculate the acceleration and then the speed of the spaceship.

Answer to Previous Question:

s = d ÷ t a = ∆s ÷ t

f = ma a = 2d/t2

Newton’s First Law: Fill in the blanks below…

“In ancient times, people assumed that an object’s natural state was at rest. Then came Sir Isaac

Newton. According to Newton’s First Law of Motion, “An object in ______________ will stay in motion until

acted upon by an outside force.” Often, this outside force is a force called ______________, which is defined

as “the resistance that one surface or object encounters when moving over another.” Surfaces like

_________________ produce a lot of friction, while surfaces like _________________ do not. Perhaps

surprisingly, the lost energy actually turns into ______________. Simply rubbing your hands together can

give you a good idea of what friction is and where that energy actually goes.”

Answer to Previous Question:

0.22 m/s2 30 m/s

Newton’s Second Law:

The cannon below was able to propel a 15 kg cannonball forward with an acceleration of 2,000 m/s2. The cannon itself has a mass of 1,500 kg.

1. How much force would the cannonball have? 2. Calculate the acceleration of the cannon.

Answer to Previous Question:

motion, friction, sandpaper, ice, heat

Newton’s Third Law: Which of the following photos show a clear example of Newton’s 3rd Law?

Answer to Previous Question:

Cannonball = 30,000 N

Cannon = 20 m/s2 backwards

(E) (F)(D)

(A) (B) (C)

Car Pushing Lab:

A group of four students pushed a car across a 20 meter track in 9.5 seconds.The car had a mass of 1,350 kg. With how much force were they pushing the car?

Answer to Previous Question:Picture A, Picture C, Picture D, and Picture F

Vectors:

One day, an Orange Cluster student went kayaking. He had a lovely day smiling, whistling, and enjoying the sunshine. But on his way home he got tired. He paddled East with a force of only 60 Newtons. But the wind pushed him to the south with a force of 20 Newtons. And the current pushed him to the West with a force of 80 Newtons. He never made it home. His body was found 10 days later, partially decomposed, but still smiling.

What was the net force and direction pushing the kayaker?

Answer to Previous Question:About 598 Newtons