Forces and Energy

Two boxes and their masses are shown below. Which of the following situations shows work being done?

• A student is sitting in a chair and holding both boxes.
• A student is holding the large box 1 m above the floor.
• A student is standing and holding the small box.
• A student is lifting the small box 0.5 m from the floor to a table.

Tags

NGSS.MS-PS2-2

Two cars with different masses travel at the same speed down a hill towards a stop sign. What will happen when both cars apply brakes at the same time to stop?

• The car with the smaller mass will require less force to stop than the car with the larger mass.
• The car with the larger mass will maintain its velocity while traveling down the hill. 
• The car with the smaller mass will take longer to stop than the car with the larger mass.
• The car with the larger mass will have less inertia than the car with the smaller mass. 

Tags

NGSS.MS-PS2-2

In the classroom demonstration shown below, a rubber ball is dropped from Position 1. The ball bounces as shown. At which of these positions does the ball have both the greatest kinetic energy and the least potential energy?

• Position 1
• Position 2
• Position 3
• Position 4

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-4

NGSS.MS-PS3-5

Which description is a correct interpretation of the graph?

• A car travels at a constant speed of 15m/s for 2 minutes. The car increases its speed from15 to 25 m/s during the next minute and then travels at a constant speed of 25 m/s for 2 more minutes.
• A car travels at a constant speed of 15 m/s for 2 minutes. The car decreases its speed from 15 to 25 m/s during the next minute and then travels at a constant speed of 25 m/s for 2 more minutes.
• A car increases its speed from 15 to 25 m/s for the first 2 minutes then travels at a constant speed for 5 minutes then increases its speed to 30 m/s during the next 5 minutes. 
• A car decreases its speed from 25 to 15 m/s for the first 2 minutes then travels at a constant speed for 5 minutes then increases its speed to 30 m/s during the next 5 minutes. 

Tags

NGSS.MS-PS3-1

The diagram below shows a hot air balloon rising. Propane gas tanks are seen at the bottom of the balloon. What energy transformations occur when propane gas is used to lift the balloon?

• Mechanical --> light --> chemical
• Chmical --> mechanical --> thermal
• Thermal --> chemical --> light
• Chemical --> thermal --> mechanical

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-3

Sometimes tectonics plates do not move easily past one another, and the plates become stuck. Forces build up, and when the plates finally move, tension is released, as shown below. The sudden movement of the plates is caused by ____. 

• the mass of the plates
• the weight of the plates
• unbalanced forces 
• gravitational force

Tags

NGSS.MS-ESS2-3

Four students were asked to classify the activities of people as examples of either potential or kinetic energy. Which student correctly classified the activities?

• Student 1
• Student 2
• Student 3
• Student 4

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-2

When a lion eats a zebra nad then uses the energy from the zebra to run, the lion's body converts _________. 

• chemical energy to mechanical energy
• electrical energy to chemical energy
• chemical energy to light energy
• mechanical energy to chemical energy

Tags

NGSS.MS-PS3-5

The graph below shows distance over time. Which of these situation could be represented by this graph? 

• A student walks 1.5 km to a friend's house in 40 minutes. The two students then wak another 1.5 km to school in 20 minutes. 
• A student walks 1.5 km to a friend's house in 20 minutes. The two students then walk anothe r 1.5 km to school in 40 minutes. 
• A student walks 1.5 km to a friend's house in 30 minutes. The two students then walk another 1.5 km to school in 30 minutes. 
• A student walks 1.5 km to a friend's house in 20 minutes. The two students then walk another 1.5 km to school in 60 minutes. 

Tags

NGSS.MS-PS3-1

The diagram below shows a sled moving along a smooth, frictionless track. In which sections of the track will the sled experience an unbalanced force? 

• Section 1 and 3
• Sections 2 and 3
• Sections 2 and 4
• Sections nd 4

Tags

NGSS.MS-PS2-2