Types of Forces 3.7A

Caleb shows the force of gravity acting on a ball. He throws the ball into the air.

What affect does gravity have on the ball?

• It pulls the ball to the left.

• It pulls the ball back down.

• It pushes the ball to the right.

• It pushes the ball higher into the air.

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The picture shows a bird, a tree, a cloud, and a dog lying on the ground. Which objects are pushing or pulling each other?

• the tree and the dog

• the bird and the cloud

• the dog and the ground

• the bird and the ground

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The model shows the movement that happened when Lucia placed a ball at the end of a ramp and a toy car at the top of the ramp.

Which describes the forces that are acting on the car and the ball to cause the movement shown?

• Gravity pulls on the car, and the ball pushes on the car.

• ​​​​​​​The ramp pulls on the car, and the ball pushes on the car.

• The ramp pulls on the car, and the car pushes on the ball.

• Gravity pulls on the car, and the car pushes on the ball.

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Which examples BEST describe gravity acting on an object or objects?

 

Select THREE correct answers.

• kite flying in the sky

• dog lying on the floor

• flag waving on a flagpole

• skydiver parachuting to Earth

• tower of toy blocks sitting on table

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Avi wants to collect observations of magnets. Testing one magnet and 10 paper clips, Avi uses a ruler to measure how far the paper clips are from the magnet. Avi holds the magnet and counts how many paper clips move to the magnet at each distance. The table shows the results.What is the pattern that describes how the magnet affects the paper clips?Avi sees that when the magnet is ​ (a)   ​ the paper clips, it pulls more paper clips.

• closer to
• farther from

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If magnets with unlike poles were to face each other, what would most likely happen?

• They will attract each other.

• They will repel each other.

• They will create a temporary electric field.

• The charges will cancel each other out.

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Zuri uses bar magnets to test, observe, measure, and analyze magnetic force. She tapes the magnets to the tops of two toy cars as shown.

When the cars are together, which describes what will happen?

Select TWO correct answers.

• The front of Car 1 will repel the back of Car 2.

• The back of Car 1 will be attracted to the front of Car 2.

• The front of Car 1 will be attracted to the front of Car 2.

• If the cars are placed side by side and facing the same way, they will repel each other.

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A student is using magnetic blocks like the ones shown here to build a bridge for some small cars made out of metal and plastic. The student notices that some of the metals cars are attracted to the magnetic-block bridge, some metal cars are not, and all plastic cars are not.

Which of these best predicts what type of cars will be affected and why?

• Any metal car with rubber wheels will not be affected because rubber is able to block magnets.

• Any metal car that contains iron will be affected because magnets are attracted to iron-containing metals.

• Any metal car containing copper will be affected because magnets are attracted to copper-containing metals.

• Any metal car without nickel will be affected because nickel is the only metal that is able to block magnets.

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What caused the rocks to fall in this landslide?

• The force of friction caused the rocks to break apart.

• The constant movement of the Earth split these rocks apart.

• Gravity was constantly pulling these rocks down towards the Earth.

• The rocks were heavier than the soil supporting them.

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Marina and Dara want to know if hitting a baseball is a pushing or a pulling motion. They design an investigation using a tee ball stand, a baseball, and a bat. They make these observations and record these results.

Which of these forces causes the most change in the ball’s position and motion?

• pushing only

• pulling only

• both pushing and pulling

• neither pushing nor pulling

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