IQWST Lesson 6 Physical Science Review

A magnet is floating motionless above another magnet in a container.

What are the forces acting on

the lower magnet?

• The magnet’s weight and the magnetic force pushing it away from the lower 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.

• The upper magnet’s weight and mass.

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What is the relation between

the two forces acting on the upper magnet?

• They are equal.

• The one acting upward is greater than the one acting downward.

• The one acting downward is greater than the one acting upward.

• Both act in the same direction

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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.

• The upper magnet’s weight and mass.

• The magnet’s weight and the magnetic force pushing it away from the lower magnet.

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What is the relation between the force the lower magnetic applies to the upper magnet and the force the upper magnet applies to the lower one?

• They are equal.

• They act in opposite directions.

• They get stronger as the magnets get closer to one another,

• All of the above

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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 pulling down, but the table is in the way.

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A rocket in outer space is traveling toward a far-off planet. An astronaut turns on the rocket’s engines, which exerts a force on the rocket. There is no gravity or air resistance.

While the engines are on, how will the rocket move?

• The rocket will move at a constant speed.

• The rocket will move faster and faster as long as

  the engines are on.

• The rocket will move faster and faster until it reaches its maximum speed.

• The rocket will move only while the engines are on.

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When the astronaut turns off the engines, what will the rocket do?

• It will steadily slow down until the force from the engines is gone.

• It will steadily slow down because no forces are acting on it.

• It will continue moving with a constant speed because the force from the engines is still acting on it.

• It will continue moving with a constant speed

  because no forces are acting on it.

Maria pushes on a heavy rock but it does not move. Why does the rock not move?

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

• Maria is exerting a force on the rock, but the force from the rock

  is stronger.

• There must be another force on the rock, opposing Maria’s push.

• The rock is heavier than Maria.

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On a visit to a science lab, Madison observes a blob of shiny material that is floating in the air. The blob is not moving. What can she conclude about the force(s) acting on the blob?

• Gravity cannot be acting on the blob

  because it is not falling down.

• Gravity must be acting on the blob or

  it would be floating.

• There are no forces acting on the

  blob because it is not moving.

• Each force acting on the blob has another one to cancel it out.

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Amelia hits a puck across the gym floor. She then observes the speed of the puck. Which of the following observations is most likely?

• The speed is constant because the

  force from Amelia’s hit is still acting on the puck.

• The speed is constant because there

  is no force acting on the side of the puck.

• The speed is decreasing because there is friction between the puck and the floor.

• The speed is zero because there is no force acting on the side of the puck.

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