Physical Science Exam Review

Which substance is most likely classified as a colloid?

• soft drink
• oxygen gas
• water
• fog

A man jogs at a velocity of 2.5 m/s west for 1,200 s. He then walks at a velocity of 1.0 m/s east for 500 s and then stops to rest. What is the displacement of the man when he stops to rest?

• 3,500 m west

• 3,000 m west

• 2,500 m west

• 700 m west

The graph below shows the motion of four cars. Based on the graph, which statement about all the cars is true?

• They are moving at a constant speed.

• They are changing their speed during travel.

• They are slowing down

• They are stopped.

A rock on Earth has a mass of 750 kg and a weight of 7,350 N. If the rock is taken into outer space, how will its mass and weight be affected?

• The weight and mass will remain the same because they are not altered by the effects of gravity.

• The weight will remain the same, but the mass will change because of the effects of gravity.

• The mass will be 76.5 kg, and the weight will increase because of the effects of gravity.

• The mass will be 750 kg, but the weight will decrease because of the effects of gravity.

As the wheels of a train move along the train tracks, what type of friction exists between the wheels and the tracks?

• fluid friction

• rolling friction

• sliding friction

• static friction

A 1,500-kg truck has a net force of 4,200 N acting on it. What is the truck’s acceleration?

• 6,300,000 m/s/s

• 2,700 m/s/s

• 2.8 m/s/s

• 0.36 m/s/s

A child fills a bucket with salt water and sand. How are the contents of the bucket classified?

• a solution

• a compound

• a homogeneous mixture

• a heterogeneous mixture

This diagram shows a 40-kg object being pulled in one direction while friction acts on it in the opposite direction.

• 160 N

• 140 N

• 120 N

• 20 N

How are the processes of melting and freezing similar?

• They are both processes that physically change a substance.

• They are both processes that chemically change a substance.

• They are both processes where heat is released by a substance.

• They are both processes where heat is absorbed by a substance.

Which element is classified as a metal?

• boron (B)

• antimony (Sb)

• phosphorus (P)

• cadmium (Cd)