General Physics 1 Review ( STEM -Tenacity)

Which of the following is NOT a correct unit for work?

• erg

• watt

• ft·lb

• newton·meter

A boy holds a 40-N weight at arm’s length for 10 s. His arm is 1.5 m above the ground. The work done by the force of the boy on the weight while he is holding it is:

• 0

• 6.1 J

• 40 J

• 60 J

If the displacement is perpendicular to the force, the work done by the force is:

• Maximum

• Minimum

• Zero

• Infinite

Which of the following does not affect the work done by a constant force?

• Magnitude of the force

• Direction of force

• Displacement

• Speed of the object

Work done to compress a spring is stored as:

• Gravitational energy

• Chemical energy

• Potential energy

• Kinetic energy

An object moves in a circle at constant speed. The work done by the centripetal force is zero because:

• the average force for each revolution is zero

• there is no friction

• the magnitude of the acceleration is zero

• the centripetal force is perpendicular to the velocity

An object of mass 1 g is whirled in a horizontal circle of radius 0.5 m at a constant speed of 2 m/s. The work done on the object during one revolution is:

• 0

• 1 J

• 2 J

• 4 J

A 1-kg block is lifted vertically 1 m by a boy. The work done by the boy is about:

• 1 ft · lb

• 1 J

• 9.8 J

• 0.1 J

If the angle between force and displacement is 0°, the work done is:

• Maximum

• Minimum

• Zero

• Undefined

The amount of work required to stop a moving object is equal to:

• the velocity of the object

• the kinetic energy of the object

• the mass of the object times its acceleration

• the mass of the object times its velocity