Energy and Work Quiz

A force of 80. N pushes a 50. kg object across a level floor for 8.0 m. The work done is
1. 10 J
2. 400 J
3. 640 J
4. 3920 J
A constant force of 20 N applied to a box causes it to move at a constant speed of 4.0 m/s. How much work is done on the box in 6.0 s ?
1. 80 J
2. 240 J
3. 120 J
4. 480 J
A force of 3 N moves a 10 kg mass horizontally a distance of 3 meters at constant velocity. The work done against friction is
1. 6 J
2. 30 J
3. 3 J
4. 9 J
The work required to raise a 10. kg box from the surface of the Earth to a height of 5.0 m is
1. 50 J
2. 100 J
3. 200 J
4. 490 J
Which is a scalar quantity ?
1. acceleration
2. momentum
3. force
4. work
What is the amount of work done when a force of 5 N moves a 10 kg mass a horizontal distance of 4 m ?
1. 5 J
2. 20 J
3. 40 J
4. 50 J
As an object slides across a horizontal surface, its gravitational PE will
1. decrease
2. increase
3. remain the same
4. cannot be determined
Which mass has the greatest gravitational PE with respect to the floor ?
1. 50 kg mass resting on the floor
2. 2 kg mass 10 m above the floor
3. 10 kg mass 2 m above the floor
4. 6 kg mass 5 m above the floor
If the speed of an object is doubled, its kinetic energy will be
1. halved
2. doubled
3. quartered
4. quadrupled
If the Kinetic energy of a 10. kg mass is 80 J, its speed is
1. 1 m/s
2. 0.125 m/s
3. 8 m/s
4. 4 m/s