Question

1. A man pushes on a box at an angle of 30.0° with a force of 20.0 N and the box moves across the floor. Which of the following component of the force do you use to calculate work?
(Points : 1)
0.00 N

10.0 N

17.3 N

20.0 N



Question 2.2. A man carries a 10 kg sack of groceries in his arms with a force of 50 N as he walks forward a distance of 10 m. How much work has he done?
(Points : 1)
0 J

50 J

100 J

500 J



Question 3.3. In which of the following situations has the energy of the object been increased?
(Points : 1)
A hammer thrower spins around while preparing to release the hammer.

A horse moves horizontally while a circus performer jumps vertically on its back.

A boy pushes a lawn mower forward by pushing at a downward angle on the handle.

A soldier runs forward, while holding a rifle above his head.



Question 4.4. A rope pulls on a metal box at an angle of 60.0° with a force of 255 N. The box moves horizontally for 15.0 m. How much work was done on the box?
(Points : 1)
255 J

1,910 J

3,310 J

3,830 J



Question 5.5. Which of the following is a scalar quantity?
(Points : 1)
parallel component of force

perpendicular component of force

displacement

work

Answer 1

1. Fx = 20*cos30 = 17.32 N.

2. Work = Fx*d = 0 * 10 = 0

3. a.

4. W = Fx*d = 255*Cos60 * 15 =

5.

Answer 2

1. 17.3 N
2. 0 J
3. A boy pushes a lawn mower forward by pushing at a downward angle on the handle
4. 1,910 J
5. Work

(I just took the test, these are the correct answers)

Answer 3

Emily L is correct