Using Unit Vectors to find Acceleration, Mass, and Velocity of 3 Forces

The video tutorial covers a physics problem involving forces acting on an object. It begins with reading the problem statement, followed by calculating the net force and its direction using the Pythagorean theorem and tangent. Newton's second law is applied to find the mass and direction of acceleration. The tutorial then calculates the velocity of the object after 15 seconds using unit vectors. A discussion on the directions of velocity and acceleration is included, concluding with an explanation of vector addition.

What are the components of Force 1 acting on the object?

• 1.00i + 4.00j Newtons

• -4.00i + 3.00j Newtons

• 1.50i - 2.50j Newtons

• 4.00i - 3.00j Newtons

How is the net force on the object calculated?

• By multiplying all forces together

• By adding the magnitudes of all forces

• By subtracting the smallest force from the largest

• By combining all i and j components of the forces

What is the direction of the net force acting on the object?

• 71.6 degrees below the positive x-axis

• 71.6 degrees above the negative x-axis

• 71.6 degrees above the positive x-axis

• 71.6 degrees below the negative x-axis

Using Newton's second law, how is the mass of the object determined?

• By adding the net force and acceleration

• By dividing the net force by the velocity

• By dividing the net force by the acceleration

• By multiplying the net force by the acceleration

What is the initial velocity of the object?

• 2.34 meters per second

• 0 meters per second

• 2.50j meters per second

• 2.50i meters per second

How is the final velocity of the object at 15 seconds calculated?

• By multiplying the initial velocity by the time

• By subtracting the initial velocity from the acceleration

• By using the initial velocity and acceleration in unit vector form

• By adding the initial velocity and the magnitude of acceleration

Why are the velocity and acceleration of the object not in the same direction?

• Because the initial velocity is zero

• Because the acceleration is zero

• Because the net force is zero

• Because the initial velocity is in the positive x direction and acceleration is at an angle