STAAR Review Part 2 (TEKS 8.6, 7.7, 6.8, & 6.9)

The main parts of a working clothes dryer are shown in the diagram. This appliance dries clothes primarily by converting —

• electrical energy to heat and mechanical energy

• mechanical energy to heat and electrical energy

• electrical energy to heat and light

• mechanical energy to heat and vaporization

An athlete is trying to lift some weights. He successfully lifts 200 N weights, but when he tries to lift 400 N weights, he is unsuccessful. Which of these correctly compares the amount of work the athlete does on the weights?

• the athlete does no work on either the 200 N weights or the 400 N weights

• the athlete does no work on the 200 N weights but does work on the 400 N weights

• the athlete does work on both the 200 N weights and the 400 N weights

• the athlete does work on the 200 N weights but does no work on the 400 n weights

Tags

NGSS.MS-PS3-2

A bus travels 20 km in 30 minutes. What is the average speed of the bus?

• 20 Km/h

• 30 km/h

• 40 km/h

• 50 km/h

During a demonstration of Newton’s laws of motion, a student used the setup shown in Figure1. The student flicked the index card with a fingertip, and the coin fell straight down into a plastic cup as shown in Figure 2. Which of these best explains why the coin fell straight down into the cup instead of remaining on the index card?

• The coin was at rest until the card was removed, so it tended to remain in the same location. Once the card was gone, the unbalanced force of gravity caused the coin to fall.

• Moving the card applied an action force on the coin. Since the card was gone, gravity applied a reaction force on the coin.

• The card had less mass than the coin, so a smaller force of gravity acted on the card. The larger force of gravity on the coin made it fall.

• The acceleration of the coin falling into the cup was equal and opposite to the acceleration of the card.

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

Four students push carts filled with sports equipment across the gym. Each student pushes with the same amount of force. Which cart has the greatest change in speed?

• 
• 
• 
• 

Tags

NGSS.MS-PS2-2

A student drew the diagram below to show the movement of water through a hydroelectric dam. The student used the diagram to describe changes in the potential and kinetic energy of the water. At which location is the gravitational potential energy of the water the greatest?

• Location W

• Location X

• Location Y

• Location Z

A basketball with a mass of 0.60 kg is accelerated with a force of 10.8 N. If resisting forces are ignored, what is the acceleration of the basketball to the nearest m/s² ?

• 6.48 m/s²

• 0.055 m/s²

• 18 m/s²

• None are correct

The diagram above shows two different forces acting on a cyclist riding a bicycle. The total mass of the cyclist and the bicycle is 100.0 kg. Based on this information, what is the acceleration of the cyclist?

• 0.66 m/s² backward, because the force of the air slows the cyclist down

• 0.66 m/s² forward, because the applied force is greater than the force of the air

• 2.3 m/s² backward, because the force are opposite and not equal

• 2.3 m/s² forward, because the cyclist's inertia is greater than the force of the air

Which of the following best describes the velocity of an object?

• 30 m/s

• 30 m east

• 30 m/s east

• 30 m/s²

A student jumps off a sled toward the west after it stops at the bottom of an icy hill. Based on the law of action–reaction, in what direction will the sled most likely move as the student jumps off?

• north

• south

• east

• west

Tags

NGSS.MS-PS2-1