8th Grade ✔ point Review

The picture shows a woman skiing down a mountain. She is increasing her speed while skiing downhill.

Which statements accurately describe the potential and kinetic energy of this skier?

• Kinetic energy increases. Potential energy remains constant.

• Kinetic energy increases. Potential energy decreases.

• Kinetic energy remains constant. Potential energy decreases.

• Kinetic energy remains constant. Potential energy increases.

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-5

A distance-time graph represents how far an object has traveled over time, allowing for the visualization of motion and speed.

In a distance-time graph, a horizontal line indicates that the object-

• Is moving at a constant speed

• Is speeding up

• Is at rest

• Is accelerating

Tags

NGSS.MS-PS3-1

This question has two parts. Answer part A, then answer part B

A basketball player jumps off the floor, pushing down on the ground with their feet.

Part A: According to Newton's Third Law, what force allows the player to move upward?

• Inertia

• The downward forces applied by the player's feet.

• The reaction force exerted by the ground.

• The force of gravity.

Which of Newton's laws explains the player's continued upward motion after their feet leave the ground until gravity pulls them back down?

• Newton's First Law

• Newton's Second Law

• Newton's Third Law

• Newton's Law of Universal Gravitation.

Tags

NGSS.MS-PS2-4

Which diagram correctly illustrates an unbalanced force being applied to an object?

• 
• 
• 
• 

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

A student lets a toy car roll four times down a ramp that is 1 m long. Each time the student covers the surface of the ramp with a different material. The student measures the time it takes the car to roll down the ramp and records the results in the table below.

• Different surfaces affect how fast a toy car accelerates.

• Different toy cars travel at different speeds.

• Gravity has little effect on the speed of toy cars on different surfaces.

• Air resistance is the greatest factor in limiting the acceleration of different toy cars.

Tags

NGSS.MS-PS2-2

NGSS.MS-PS3-1

NGSS.MS-PS3-5

A car travels 150 kilometers in 3 hours. What is the average speed of the car?

• 50 km/sec

• 50 mi/hr

• 50 mi/sec

• 50 km/hr

Tags

NGSS.MS-PS3-1

You push a 4 kg box with a force of 36 Newtons and it accelerates at 9m/s^2.

If you push a different box with a mass of 3 kg with the same force, what will be its acceleration?

• 3 m/s²

• 6 m/s²

• 9 m/s²

• 12 m/s²

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

Which of Newton's Laws relates to the action of the rider on horse number two?

• When an object is at rest, it will remain at rest.

• The amount of force is equal to mass times acceleration.

• For every action, there is an equal and opposite reaction.

• An object in motion continues in the same direction and speed.

Tags

NGSS.MS-PS2-1

The balanced equation below represents the reaction of NaOH with H₃PO_4.

When 30 grams of NaOH reacts with 48 grams of H₃PO₄, 9 grams of NaH₂PO₄ is produced. How many grams of water (H₂O) are produced?

• 11 grams

• 60 grams

• 69 grams

• 78 grams

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5