Exam #2 Review

A student is pushing a box across a floor. The box is sliding from right to left. In what direction is the force due to friction pointing?

• From left to right (opposite direction as F_app)

• From right to left (same direction as F_app)

• From the ground up (perpendicular to F_app)

• From the top of the box down (perpendicular to F_app)

Which forces are represented in the diagram shown here?

• F_grav, F_spring, F_norm, F_app

• F_app, F_grav, F_air

• F_app, F_fric, F_norm, F_grav

• F_spring, F_tens, F_grav, F_app

Which of the following forces could be an upward force? Select all correct answers.

• Gravity

• Tension

• Air resistance

• Normal

• Applied

Which of the following forces could be a downward force? Select all correct answers.

• Gravity

• Tension

• Air resistance

• Normal

• Applied

Andrei is ice-skating over a frictionless surface. Which FBD best describes the forces acting Andrei as he skates?

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Adam climbs an oak tree and then jumps off a branch to the ground. Which FBD best describes the forces acting on Adam just before he lands?

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A disco-ball hangs on a cord from the ceiling. Which FBD best describes the forces acting on the disco-ball as it hangs?

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Ventura sits in his car at a stoplight. Which FBD best describes the forces acting on Ventura's car before he begins to accelerate?

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How many forces are acting on Edwin as he drives his car to the left?

• Two (F_grav, F_app)

• Four (F_fric, F_tens, F_app, F_grav)

• Three (F_grav, F_norm, F_app)

• Four (F_grav, F_norm, F_app, F_fric)

Jev's car is coasting (i.e., not accelerating) to the right and slowing down. Which FBD best describes the forces acting on the car?

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