Newton's First Law(25 min)

Four forces act on a hot-air balloon, shown from

the side in the figure below. Find the magnitude of the resultant force on the balloon.

A 2.26 kg book is dropped from a height of 1.5 m.

What is its weight in newtons?

A crate is pulled to the right (positive x-axis) with

a force of 82.0 N, to the left with a force of 115 N,

upward with a force of 565 N, and downward with

a force of 236 N. Find the magnitude and direction of the net force on the crate.

• 3.30 N at 96˚ counterclockwise from the positive x-axis

• 3.30 N at 6˚ counterclockwise from the positive x-axis

• 3.30 x 10² N at 96˚ counterclockwise from the positive x-axis

• 3.30 x 10² N at 6˚ counterclockwise from the positive x-axis

Michael pushes a 2kg box with 30N of force to the left. Annie pushes the same box with 40N of force to the right. What is the net force on the box?

• 1.33N

• -10N

• 10N

• 0.75N

An airplane has a mass of 94000kg. What is the minimum necessary lift force to get the airplane off the ground?

g=−9.8m/s²

• 921200N

• 827200N

• 1842400N

• 94000N

Miguel pushes a box with 13N of force to the left. His sister Alexis pushes with 13N of force to the right. What is the net force on the box?

• 26N

• −26N

• 0N

• 13N

Two dogs pull on a bone. One pulls with 32N of force to the right and one pulls with 35N of force to the left. What is the net force on the bone?

• 67N to the left

• 3N to the left

• 3N to the right

• 67N to the right

Which of the following represents the force due to gravity?

• Y

• Z

• V

• W

Which of the following represents the force due to friction?

• V

• Z

• Y

• W

Which of the following represents the normal force?

• V

• Y

• Z

• W