Physical Science NCFE Review

A man jogs at a velocity of 2.0 m/s west for 1,500 s. He then walks at a velocity of 0.8 m/s east for 600 s and then stops to rest. What is the displacement of the man when he stops to rest?

• 3,000 m west

• 2,520 m west

• 1,550 m west

• 640 m west

Which statement about the mass of an object is correct?

• mass is a changing measurement depending on an object's weight

• the force of gravity determines an object's mass

• the weight and mass of an object are the same thing

• Mass is an unchanging measure of the amount of matter in an object

A 2,200-kg truck has a net force of 3,000 N acting on it. What is the truck's acceleration?

• 6,600,000 m/s/s

• 5,200 m/s/s

• 1.36 m/s/s

• 0.73 m/s/s

This diagram shows a 55-kg object being pulled in one direction while friction acts on it in the opposite direction.

What is the net force on the object?

• 13, 475 N

• 245 N

• 155 N

• 4.45 N

The diagram shown is the Bohr model of an atom. Which best descries this atom?

• It has 6 electrons

• It has a positive charge

• It has 6 valence electrons

• It has a full outermost energy level

How many valence electrons does a neutral atom of Carbon (C) have?

• 2

• 4

• 6

• 12

Which of these elements is the most chemically reactive?

• beryllium (Be)

• calcium (Ca)

• strontium (Sr)

• radium (Ra)

A 200-kg rock is at the top of a cliff. What happens to its energy as it beings to fall?

• Its kinetic energy is transformed into potential energy

• Its potential energy is transformed into kinetic energy

• Its potential energy increases

• Its kinetic energy decreases

It takes 5.0 seconds for a pulley system to lift a crane weighing 250 N to a height of 4.5 meters. How much power is required to lift the crate?

• 1125 W

• 225 W

• 55 W

• 30 W

If the velocity of a sound wave remains constant and its frequency decreases, which characteristic of the wave will increase?

• amplitude

• wavelength

• energy

• speed