Pop Quiz Forces and Motion Wednesday 4/26/23

Pulling a wagon with bricks in it is more difficult that pulling an empty wagon. This obeys which of Newton’s Laws?

• a. Newton’s First Law of Motion
• b. Newton’s Second law of Motion
• c. Newton’s Third Law of Motion

Andrew began driving at 9:00 AM and traveled without stopping for 100 miles to Miami, Florida. If you wanted to calculate Andrew’s average speed, what information would you need?

• a. The direction Andrew drove.
• b. The time Andrew arrived in Miami. (Then Calculate Distance/Time)
• c. The initial speed and the final speed Andrew drove.
• d. The type of vehicle Andrew was driving.

Acceleration can be a change in speed or

• a. Friction
• b. Velocity/Direction
• c. Time
• d. Force

Standing on the ground and the ground pushing up at your feet obeys which of Newton’s Laws?

• a. Newton’s First Law of Motion
• b. Newton’s Second law of Motion
• c. Newton’s Third Law of Motion

11. Michael and Jeff are trying to move a new refrigerator into the kitchen. Michael pushed with 350 Newtons of force forward and Jeff pushed with 300 Newtons forward. What is the Net Force? Is this balanced or unbalanced?

Answer explanation

Correct answer: 650 N Forward, this is unbalanced

Compare balanced and unbalanced forces. Which one has motion or movement?

Answer explanation

Correct answer: Unbalanced forces have a net force greater than 0 and have motion, balanced forces have a net force of 0 and no movement

Fill in the blanks with the correct term from the box.

• Newton's 2nd Law

• _______________ can cause a change in motion. They have a net force greater than 0.

• Unbalanced Forces

• ____________ is the change in velocity over time

• Acceleration

• .__________________ states that the acceleration of an object depends on the mass of the object and the amount of force applied.

• Balanced Forces

• ____________ is speed in a specific direction.

• Velocity

• ______________ do not change motion. They have a net force of 0.