Q2 Long Exam

By definition, work is define as ____.

• A. the dot product of force and distance

• B. the cross product of force and distance

• C. the dot product of force and displacement

• D. the cross product of force and displacement

Which of the following is not a scalar quantity?

• A. The temperature of an iron bar

• B. Earth's pull on your body

• C. The mass of a football

• D. The age of the Earth

What is the cross product of the unit vector ĵ with itself?

• A. 0

• B. 1

• C. -1

• D. undefined

The momentum of a system commonly depends on what physical quantities?

• A. mass and shape

• B. mass and energy

• C. mass and speed

• D. mass and velocity

Which of the following statements best describes the impulse-momentum theorem?

• A. The force on a moving object is equal to the magnitude of the impulse.

• B. The impulse on an object is equal to the change in momentum it causes.

• C. The impulse on an object is less than the change in momentum it causes.

• D. The impulse on an object is greater than the change in momentum it causes.

What will happen to the colliding bodies in a completely inelastic collision?

• A. Both stopped at the collision point and both momentum and total kinetic energy are conserved.

• B. Maintains its initial velocity after colliding and neither momentum nor kinetic energy is conserved.

• C. Bounce away from each other after collision and the initial kinetic energy is equal to the final kinetic energy.

• D. Stick together and move as one body after collision and the initial kinetic energy is greater than the final kinetic energy

What refers to the rate of change of the angular displacement per unit of time?

• A. Angular velocity

• B. Angular acceleration

• C. Linear velocity

• D. Tangential acceleration

An object is in static equilibrium if _____.

• A. When the net force acting on the object is zero

• B. When the net torque on the object is zero.

• C. Both A and B

• D. None of the above

What can we infer if the two vectors are perpendicular?

• A. Both are not necessarily zero.

• B. Both are zero.

• C. The cross product is zero.

• D. The dot product is zero.

In which areas in the force vs. position graph is the work negative?

• A. Areas above the position axis

• B. Areas below the position axis

• C. Areas in the left of the force axis

• D. Areas in the right of the force axis.