Understanding Work in Physics: Horizontal Motion

What is the angle theta in the work equation?

• The angle between the force and the distance

• The angle between the applied force and friction

• The angle between the displacement and the force

• The angle between the object and the ground

When does positive work occur?

• When force and displacement are perpendicular

• When force and displacement are in the same direction

• When force and displacement are in opposite directions

• When there is no displacement

What is the cosine of the angle when positive work is done?

• Undefined

• +1

• -1

• 0

Which force commonly performs negative work?

• Gravitational force

• Normal force

• Applied force

• Frictional force

What is the cosine of 180 degrees, which is used in calculating negative work?

• +1

• 0

• -1

• Undefined

What is the net work done when forces are balanced and the object moves at constant velocity?

• Undefined

• Zero

• Negative

• Positive

What is the angle between displacement and normal force when zero work is done?

• 270 degrees

• 180 degrees

• 0 degrees

• 90 degrees

Which force does zero work when an object moves horizontally?

• Frictional force

• All forces do work

• Gravitational force

• Applied force

What is the cosine of 270 degrees, used in calculating zero work?

• 0

• +1

• Undefined

• -1

What happens to the net work when an object is not accelerating?

• It is undefined

• It is zero

• It is negative

• It is positive