Log inSign up for FREE
Library

8th Grade Final

Last updated 8 months ago
19 questions
Required
1

When a comet enters the solar system, it curves toward the sun. Which statement describes why the sun does not move when a comet is nearby?

Required
1

Sasha pulls a block across the floor at a constant speed. Why doesn’t the motion of the block change even though Sasha is pulling on it?

Required
1

The ball exerts a force on the target, causing the target to fall over. But when this happens, the ball bounces backward. Why does the ball bounce backward?

Required
1

Two cars travel on a straight road from point A to point B. Both cars accelerate to their maximum speed and then continue at that speed for the rest of the distance. Car 1 accelerates from rest to 20 m/s over 30 s. It reaches point B in 35 s. Car 2 accelerates from rest to 20 m/s over 20 s. It reaches point B in 30 s. Which car uses a larger acceleration to reach its maximum speed, and which car has a larger average speed?

Required
1

The weights of four objects with different masses have been calculated to show how much each object would weigh on four different planets.
Based on the table, which object would have the largest mass and greatest weight on Earth?

Required
1

  1. The diagram shows four blocks suspended on identical dynamometers, a tool that is used for measuring the weights of objects. 📷
Which object has the greatest weight?

Required
1

What relationship is shown in the picture?

Required
1

Which statement describes the charges shown?

Required
1

Jesse tests three magnets by observing how many paper clips he can attach to the north pole in a single chain. He finds that Magnet A holds six paper clips, Magnet B holds five paper clips, and Magnet C holds two paper clips. He warms Magnets A and C in the oven for a few minutes and repeats his procedure. This time, Magnet A holds only four paper clips, Magnet B still holds five paper clips, and Magnet C cannot hold any paper clips. Which statement explains Jesse’s observations?

Required
1

Samantha is making waves in a tub of water by pushing a block up and down at one end of the tub. She observes the properties of each of the waves. What can she say about the properties of the waves?

Required
1

Which of these will double the energy of a wave?

Required
1

Hamza holds his hand close to a hot surface. He can feel the infrared waves but cannot see them. What explains Hamza’s observation?

Required
1

Which statement describes how sound waves are transmitted through a medium?

Required
3

The picture shows a wave created by the movement of a rope. Select the answer matching the correct letter for numbers 15, 16, and 17 in the boxes to correctly label the parts of the wave. Some letters may be used more than once or not at all.

Required
1

True or False?

Required
1

Select A for contact force or B for noncontact force each statement to show whether the force is a contact force (A) or a noncontact force (B).
Gravity is a___________

Required
1

Select A for contact force or B for noncontact force each statement to show whether the force is a contact force (A) or a noncontact force (B).
Friction is a___________

Required
1

Analyze the diagram and determine if the statement is true or false.

Required
1

Select A for contact force or B for noncontact force each statement to show whether the force is a contact force (A) or a noncontact force (B).
magnetic force is a___________