Physics 6.1 Practice Questions

1. If the force exerted by the intern is doubled and the distance is halved, does the work done by the intern increase, decrease, or remain the same?

• increase

• decrease

• remain the same

2. There is a species of Darwin's finch on the Galapagos Islands that can exert a force of 205 N with its beak as it cracks open a seed case. If its beak moves through a distance of 0.40 cm during this operation, how much work (in Joules) does the finch do to get at the seed inside the case?
<truncate your answer to 2 decimal places>

Tags

NGSS.HS-PS2-1

3. Early one October you go to a pumpkin patch to select your Halloween pumpkin. You lift a 3.2 kg pumpkin to a height of 0.80 m to check it out. How much work (in joules) do you do on the pumpkin when you lift it from the ground?
<truncate your answer to 2 decimal places>

5. A parent pulls a child in a little red wagon with constant speed. If the parent pulls with a force of 16 N for 12 m and the handle of the wagon is inclined at an angle of 25 degrees above the horizontal, how much work does the parent do on the wagon (in joules)?

<truncate your answer to 2 decimal places>

Tags

NGSS.HS-PS3-2

12. A child in a tree house uses a rope attached to a basket to lift a 22 N dog upward through a distance of 4.7 m into the house. How much work (in joules) does the child do in lifting the dog?

<truncate your answer to 2 decimal places>

13. To move a suitcase up to the check-in stand at an airport, a student pushes with a horizontal force through a distance of 0.95 m. If the work done by the student is 32 J, what is the magnitude of the force he exerts?

14. A farmhand pushes a bale of hay 3.9 m across the floor of a barn. She exerts a force of 88 N at an angle of 25 degrees below the horizontal. How much work has she done?

What is the SI unit of work?

• joules

• watts

• newtons

• m/s²

Done when a force is applied to an object and the object moves in the direction of the applied force.

• work

• power

• force

• energy

Wyatt pushes on a large, immovable boulder with 50 N of force. If he doubles his force, what happens to his work?

• it doubles

• it is zero

• it is halved

• it is quadrupled

Tags

NGSS.HS-PS3-2