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Practice applying what you know by answering these questions.

Apply what you've learned thus far about Newton's Second Law to complete the multiple choice activity below.

If you were to push on a 2.0 kg object with force, F, it would accelerate with an acceleration, a. What would the acceleration be if you doubled the force?

  1. a
  2. 2a
  3. \(\small\mathsf{ \frac{1}{2}a }\)
  4. \(\small\mathsf{ \frac{1}{a} }\)

Force is directly proportional to acceleration.

Force is directly proportional to acceleration.

Force is directly proportional to acceleration.

Force is directly proportional to acceleration.

If you were to push on a 2.0 kg object with force, F, it would accelerate with an acceleration, a. What would the acceleration be if the mass was doubled?

  1. a
  2. 2a
  3. \(\small\mathsf{ \frac{1}{2}a }\)
  4. \(\small\mathsf{ \frac{1}{a} }\)

Acceleration is inversely proportional to the mass of the object.

Acceleration is inversely proportional to the mass of the object.

Acceleration is inversely proportional to the mass of the object.

Acceleration is inversely proportional to the mass of the object.

A 2520.0 kg airplane starting from rest accelerates to 80.00 m/s in 20.00 seconds. What is the net force acting on the airplane?

  1. 630.0 N
  2. 10,080 N
  3. 201,600 N
  4. 4,032,000 N

Use \(\mathsf{\overrightarrow{a} = \frac{\overrightarrow{v}_f - \overrightarrow{v}_i}{t} }\) to find the acceleration, then Newton's Second Law to find the net force.

Use \(\mathsf{\overrightarrow{a} = \frac{\overrightarrow{v}_f - \overrightarrow{v}_i}{t} }\) to find the acceleration, then Newton's Second Law to find the net force.

Use \(\mathsf{\overrightarrow{a} = \frac{\overrightarrow{v}_f - \overrightarrow{v}_i}{t} }\) to find the acceleration, then Newton's Second Law to find the net force.

Use \(\mathsf{\overrightarrow{a} = \frac{\overrightarrow{v}_f - \overrightarrow{v}_i}{t} }\) to find the acceleration, then Newton's Second Law to find the net force.

Two forces are applied to a 1200.0 kg car: one 380.0 N force at an angle of 60.0° north of east and a 450.0 N force at 10.0° east of north. If the two forces are applied for a total of 3.00 seconds, how fast will the car be moving and in what direction?

  1. 1.95 m/s
  2. 2.08 m/s
  3. 4.72 m/s
  4. 6.36 m/s

First, find the resultant force's magnitude and direction using trigonometric principles. Then, solve for the acceleration using that force. Finally, use the acceleration in the kinematics equation to find the final velocity.

First, find the resultant force's magnitude and direction using trigonometric principles. Then, solve for the acceleration using that force. Finally, use the acceleration in the kinematics equation to find the final velocity.

First, find the resultant force's magnitude and direction using trigonometric principles. Then, solve for the acceleration using that force. Finally, use the acceleration in the kinematics equation to find the final velocity.

First, find the resultant force's magnitude and direction using trigonometric principles. Then, solve for the acceleration using that force. Finally, use the acceleration in the kinematics equation to find the final velocity.

Summary

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