Question

1.

What is Bernoulli's principle?

The principal of the school a kid named Bernoulli goes to

When a flow of fluid enters an area of low pressure, it speeds up

The principle idea that a cream filled snack is preserved when surrounded by a shell

2.

A net force of 8 N is applied to a 2 kg object. The object’s acceleration is

4 m/s2

8 m/s2

16 m/s2

2 m/s2

3.

Suppose a 2 kg object is falling through the air and accelerating downwards at 8 m/s². Taking g = 10 m/s² What is the magnitude and direction of the force of air resistance on it?

		2N downward
		2N upward
		1N downward
		1N upward

Answer 1

Problem 1) Option (b)

Problem 2) Acceleration, a = F/m = 8/2 = 4 m/s²

Problem 3) Acceleration a = 8 m/s 2

Acceleration due to gravity g = 10 m/s 2

mass of the object m = 2 kg

net force F = weight - air resistance

          ma = mg - air resistance

air resistance = mg - ma

                     = m(g-a) = 2(10-8) = 2 (2) = 4 N upward