Unit 3 Quiz

Four students designed and built air propelled rockets that were launched into the air. Their data are recorded in the table. Which rocket had the greatest acceleration?

• Rocket 1

• Rocket 2

• Rocket 3

• Rocket 4

A student pushes a 51.5 kilogram bookshelf across a smooth floor with a net force of 67N. What is the approximate acceleration of the bookshelf?

• 1.3 m/s2

• 3,405.5 m/s2

• 15.5 m/s2

• 0.77 m/s2

A mother and daughter press their hands together and then push apart while ice skating. Immediately after they push away from each other, how does the motion of the mother and daughter change?

• The mother moves forward & daughter moves back with greater acceleration

• Both move forward, but the mother moves with a greater acceleration

• The mother moves backward, and the daughter moves forward with a greater acceleration

• Both move backward, but the daughter moves with a greater acceleration

A motorcycle travels 8.9 meters per second around a track. The dotted line shows the bath of the motorcycle. The arrow shows the direction of the motorcycle at position 1. Which comparison of the motorcycles motion is correct>

• At position 1 and 3, the velocities are the same, but the accelerations are different

• At positions 1 and 4, the speeds are the same, but the velocities are different

• At positions 2 and 3, the accelerations are the same, but the velocities are different

• At positions 2 and 4, the velocities are the same, but the speeds are different

A car initially traveling at 8.0 meters per second doubles its speed while traveling in a northeast direction. Students used a table to record the initial and final conditions for speed and velocity. Which table is correct?

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A student investigates the motion of a toy vehicle. The student graphs 40 seconds of data from the investigation. Which statement best describes the motion of the toy vehicle during the first 30 seconds of the investigation?

• The vehicle was traveling at a constant speed

• The vehicle was accelerating at a constant rate

• The speed of the vehicle was increasing

• The acceleration of the vehicle was increasing

A plastic tube is arranged on a lab tabletop as shown. A small sphere enters one end of the tube with enough speed to come out the other end of the tube. Which diagram shows where the sphere will go first when it leaves the tube?

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A photograph of a bird perched on a fence post is shown. Which description best identifies the action-reaction pair between the bird and fence post?

• Action: The force of the bird on the wires

  Reaction: The force of the wires on the fence post

• Action: The force of the wires on the fence post

  Reaction: The force of the fence post on the bird

• Action: The force of the fence post on the bird

  Reaction: The force of the bird on the wires

• Action: The force of the bird on the fence post

  Reaction: The force of the fence post on the bird

A pitcher throw a ball toward a player holding a softball bat. The player uses the bat to hit the ball. The bat applies a 10-newton force to the ball. Which statement correctly describes the reaction force between the bat and the ball?

• The reaction force is the force that causes the ball to move toward the bat

• The reaction force is the force applied to the bat by the player holding the bat

• The reaction force is the force that pulls the ball toward the ground

• The reaction force is the force of the ball on the bat

A steel ball is at one end of a box that is moving forward as shown. The box suddenly stops. According to Newton's first law, what happens to the steel ball just after the box stops?

• Because of friction, the ball continues rolling forward at the same speed

• Because of friction, the ball rolls forward at an increased speed

• Because of inertia, the ball continues rolling forward at the same speed

• Because of inertia, the ball rolls forward at an increased speed