Physical Science MidTerm Review S2021

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 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

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

What is the net force on the object?

• 160 N

• 140 N

• 120 N

• 20 N

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

The chart shows the force applied on four different objects and the distance each object moves.

On which object was the least amount of work done?

• W

• X

• Y

• Z

It takes 6.0 seconds for a pulley system to lift a crate weighing 300. N to a height of 5.0 meters. How much power is required to lift the crate?

• 360 W

• 250 W

• 10 W

• 0.1 W

A wave has a frequency of 4.0 Hz. If it is traveling at a velocity of 20 m/s, what is the wavelength of the wave?

• 80 m

• 16 m

• 5.0 m

• 0.2 m