Grade 8 Science: Unit 3 Review

Which question would allow you to collect data about the strength of a magnetic field?

• What happens to a magnet in a fire?

• How many nails can a magnet hold?

• What is the effect of moving a magnet near a compass?

• How many batteries are used in an electromagnet?

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

When the ball is on its way down through point A, what force(s) are acting upon it?

• Only gravity and air friction are acting on the ball.

• Only the force from the person’s push is acting on the ball.

• There are no forces acting on the ball.

• Both gravity and the force from the person’s push are acting on the ball.

Tags

NGSS.MS-PS2-2

NGSS.MS-PS2-4

When the ball is on its way back up through point B, what force(s) are acting on the ball?

• There are no forces acting on the ball.

• Both gravity and the force from the floor are acting on the ball.

• Only the force from the floor is acting on the ball.

• Only gravity and air friction are acting on the ball.

Tags

NGSS.MS-PS2-4

What are the two forces acting on the upper magnet?

• the magnet's weight and the magnetic force attracting it to the lower magnet

• two magnetic forces: one attracting it to the lower magnet and another pushing it away from the lower magnet

• gravity and the magnetic force pushing it away from the lower magnet

• the upper magnet's weight and mass

Tags

NGSS.MS-PS2-5

What is the relationship between the force the lower magnet applies to the upper magnet and the force the upper magnet applies to the lower magnet?

• A. They are equal.

• B. They act in opposite directions.

• C. They get stronger as the magnets get closer to one another.

• D. All of the above.

Tags

NGSS.MS-PS2-1

A student pushes on a heavy rock, but it does not move. Why does the rock not move?

• The rock is heavier than the student.

• There must be another force on the rock, opposing the student's push.

• Nothing is moving, so there are no forces acting.

• The student is exerting a force on the rock, but the force from the rock is stronger.

Tags

NGSS.MS-PS2-2

If object A feels an attractive force 420 N from object B, what kind of force will object A feel if its mass is doubled?

• 420 N

• 840 N

• 210 N

• No force

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

Why is the box sitting on the table not moving?

• No forces are acting on the box.

• The table pushes up with the same force that gravity pulls down.

• Gravity is keeping the box down on the table.

• Gravity is pushing up, but the table is in the way.

Tags

NGSS.3-PS2-1

Every airplane has at least four different forces acting on it. Which of the following is NOT one of those forces?

• Thrust

• Drag

• Weight

• Gravity

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

As the plane is flying at a speed of 320 mph, the wind begins to blow in the opposite direction with a force of 40N. In order for the pilot to maintain the plane’s 320 mph speed, what amount of thrust force will the engine need to apply?

• 320 mph

• 320 N

• 360 N

• 40 N

Tags

NGSS.HS-PS2-1