Ch.15

A teacher walks by a student's desk. The student's desk was in front of the teacher and is now behind the teacher. What term describes the change in the teachers position compared to the desk?

• velocity

• relative motion

• relative position

• frame of reference

A train goes around a corner at the same speed it was traveling on a straight track. What is this example of?

• speed

• acceleration

• relative motion

• frame of reference

A student wants to describe the velocity of a moving car. What information does the student need?

• speed and position

• speed and direction

• direction and position

• direction and relative motion

Which objects requires the least amount of force to move it 5 m?

• golf ball

• soccer ball

• bowling ball

• table tennis ball

Two students push boxes with the same mass for 10 seconds. Which student moved her box a greater distance?

• the student who pushed with the less force.

• the student who had a lesser body mass

• the student who pushed with more force

• the student who had a greater body mass.

What happens if balanced forces are applied to a moving object?

• The object stops moving.

• The object moves faster in the same direction.

• The object moves slower in the same direction.

• The object keeps moving at the same speed and direction.

A soccer ball is rolled across four different surfaces with the same force. Which surface will slow the movement of the soccer ball the most?

• the floor

• paved road

• grassy field

• cement sidewalk

A student is holding a yo-yo in his hand. He is ready to release it, but has not done so yet. What kind of energy does the yo-yo have?

• kinetic energy

• potential energy

• both kinetic and potential energy

• neither kinetic nor potential energy

Force is measured in what unit?

• watt

• joule

• henry

• newton

Which best describes the motion of a guitar string as it is plucked?

• an object moving back and forth

• an object moving in a straight line

• an object moving on a curved path

• an object moving in circular motion