Unit 1 Chapter 3

What forces are causing the swing to move in Figure 1?

• A swing moves up when gravity pushed a person up and the force of gravity pulls the swing down.

• A swing moves down when a person pushes up with his legs and the force of gravity pulls the swing up.

• A swing moves up when a person pushes up with his legs and the force of gravity pulls the swing down.

• The swing moves up when the forces are balanced.

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Which statement best describes how gravity affects motion?

• Gravity pulls objects toward each other.

• Gravity pushes objects away from each other.

• Gravity must have contact with the object to move it.

• Gravity cannot affect motion.

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Below is a picture of a person kicking a soccer ball. The picture shows the path of the ball. Which statement best describes the motion of the ball after #5? 

• It will go up.

• It will go down.

• It will go backward.

• It will stay in the air.

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Scientists often look in caves for clues about Earth’s history.  Sometimes the opening to a cave is easy to get through.  Other times it is not, because it could be blocked.

 

The image below shows a cave being blocked by a boulder (big rock).  The boulder is firmly planted into the ground, and there is grass growing around it. Imagine a group of scientists wants to get inside the blocked cave.  The boulder will need to be moved.  First, the scientists must identify the type of force that is acting on the boulder.  There are different kinds of forces.

Choose 2 forces that are acting on the boulder.

• The boulder is being kept in place by a push.

• The boulder is being kept in place by a pull

• The boulder is being kept in place by gravity

• The boulder is being kept in place by a magnet

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The scientists realize that lifting the boulder off the ground will give them the most access to the cave.  Which statement best describes the kind of force needed to lift the boulder off the ground? 

• A force that is similar to gravity.

• A force that is weaker than gravity.

• A force that is stronger than gravity.

• A force that is just as strong as gravity

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 Choose two types of forces that are acting on this falling block

• Pull

• non-touching

• touching

• push

• magnetic

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what caused the rocks to start moving?

• Magnetic force

•  Balanced force

•  Gravity

• Push

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Which claim is NOT correct?

• Gravity and magnetic force are the same because they are both touching forces.

• Gravity and magnetic force are the same because they both can attract.  

• Gravity and magnetic force are different because gravity can't repel. 

• Gravity is exerted on all objects, but magnetic force is only exerted on some.

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What two forces are acting on the block in the diagram?  Choose 2.

• Magnetic force

• Touching force

• Gravity

• Push

• Repelling force

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Which of the following describe the force of gravity? Choose 3

• Non-touching

• Touching force

• Attracting force

• Pulling force

• Repelling force

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