SIFT Physics and Simple Machines Questions and Answers 3

Question 1

A 200 N force is applied to a hydraulic piston with area 0.01 m². What pressure does this create in the fluid?

Accepted Answer

20,000 Pa

Answer

2 Pa

Answer

200 Pa

Answer

2,000 Pa

Question 2

Which of Newton's Laws states that for every action there is an equal and opposite reaction?

Accepted Answer

Newton's Third Law (Action-Reaction)

Answer

Newton's First Law (Inertia)

Answer

Newton's Second Law (F = ma)

Answer

Newton's Law of Gravitation

Question 3

What is the mechanical advantage of a wedge that is 12 cm long and 3 cm wide at its widest point?

Accepted Answer

4

Answer

0.25

Answer

3

Answer

36

Question 4

An electric motor draws 5 A at 120 V. What is its power consumption?

Accepted Answer

600 W

Answer

24 W

Answer

120 W

Answer

3,600 W

Question 5

What is 'mechanical efficiency' in a machine?

Accepted Answer

The ratio of output power to input power, expressed as a percentage

Answer

The maximum load a machine can lift regardless of friction

Answer

The speed ratio of input to output components

Answer

The number of moving parts in a mechanism

Question 6

A 3 kg ball is traveling at 6 m/s. What is its kinetic energy?

Accepted Answer

54 J

Answer

9 J

Answer

18 J

Answer

108 J