SIFT Physics and Simple Machines Questions and Answers 2

Question 1

An object is accelerating at 3 m/s². If the net force on it is 15 N, what is its mass?

Accepted Answer

5 kg

Answer

0.2 kg

Answer

18 kg

Answer

45 kg

Question 2

What is the unit of power in the SI system?

Accepted Answer

Watt

Answer

Joule

Answer

Newton

Answer

Pascal

Question 3

An object at the top of a 50-meter cliff has potential energy of 4,900 J. What is its mass? (g = 9.8 m/s²)

Accepted Answer

10 kg

Answer

2 kg

Answer

5 kg

Answer

100 kg

Question 4

What is the mechanical advantage of a screw with a pitch of 0.5 cm and a handle radius of 10 cm? (MA = 2πr/p)

Accepted Answer

~125.7

Answer

5

Answer

20

Answer

0.05

Question 5

Two identical springs, each with spring constant k=100 N/m, are connected in parallel. What is the combined spring constant?

Accepted Answer

200 N/m

Answer

50 N/m

Answer

100 N/m

Answer

10,000 N/m

Question 6

What is the velocity ratio of a block-and-tackle system with 4 rope segments supporting the load?

Accepted Answer

4

Answer

1

Answer

2

Answer

8