Balancing Forces Unit Review

During an investigation a class observed that a spoon was attracted to magnets. What can they infer about the spoon?

• It is made of magnets.

• It is made of aluminum.

• It is made of iron.

• It is made of plastic.

Answer explanation

The spoon being attracted to magnets indicates that it is made from a magnetic material. Out of all the provided options, only iron is a magnetic material. Therefore, the spoon is made of iron.

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This girl is about to hit this volleyball. Predict the path of the volleyball after the girl hits it.

• It will go up.

• It will go down.

• It will go backwards.

• It will stay in the air.

Answer explanation

The correct answer is 'It will go up'. When the girl hits the volleyball, it will be propelled upwards due to the force applied by the hit. The direction of the volleyball after being hit is determined by the direction of the force applied, which in this case is upwards.

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Which kind of force is happening in this picture?

• balanced force

• unbalanced force

• magnetic force

• non touching force

Answer explanation

The question is asking about the type of force shown in the picture. The correct answer is 'balanced force'. This is because a balanced force is a condition where two forces acting on an object are equal in size but opposite in direction, thus creating a state of equilibrium or balance. Other options are not relevant to the scenario presented in the question.

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What kind of force is shown in this picture?

• balanced force

• magnetic force

• unbalanced force

• non touching force

Answer explanation

The picture depicts an unbalanced force. In physics, when the forces acting on an object are not equal, leading to a change in the object's motion, they are termed as unbalanced forces. Hence, the correct answer is 'unbalanced force'.

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A ________________ force is a force that acts between objects that are NOT touching each other.

• obsevational

• evidence

• non-touching

• touching

Answer explanation

The correct option is 'non-touching'. When two objects are not in physical contact, but there's a force acting between them, it's referred to as a non-touching force. Examples are gravitational and electrostatic forces. Other options are not applicable here as they do not fit the scenario presented in the question.

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What causes the train to fall back on the tracks? Choose 2 answers.

• Friction

• Gravity

• Turning Electromagnets off

• Turning Electromagnets on

Answer explanation

The train falls back on the tracks due to two main reasons. One is gravity, which pulls everything towards the center of the earth, including trains. Gravity is always at work, keeping the train on its tracks. The other reason is the turning off of electromagnets. When turned off, the magnetic field disappears, allowing gravity to pull the train back to the track.

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Both the red stickman and blue stickman are pushing the box in front of a flagpole.  What is this diagram showing?

• The red stickman is applying more force.

• The blue stickman is applying more force.

• The force applied on the box is balanced.

• They are both applying the same amount of force.

Answer explanation

The question describes a scenario where both a red and a blue stickman are pushing a box. The answer indicates that the red stickman is applying more force. This suggests that the box is likely moving in the direction of the red stickman, indicating that his force is greater than the blue stickman's.

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Kristy put a marble on the table and balanced the forced on the marble so it does not move.  She then lightly pushes the marble with her finger, making the force unbalanced.  When she does, the marble ________

• Does Nothing

• Rolls Slowly

• Rolls quickly

• Spins quickly

Answer explanation

The question is about the behavior of a marble when the force applied on it is unbalanced. When Kristy lightly pushes the marble, it disrupts the balance of forces, causing the marble to move. The correct answer is 'Rolls Slowly' as a light push would not generate enough force to make the marble roll or spin quickly, nor would it cause the marble to remain stationary.

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How will the motion of the individual change due to the unbalanced forces?

• When the three players start to tug against the individual, at first, he will move towards them and then eventually win the game.

• When the three players start to tug against the individual, at first, he will move towards them and then eventually lose the game.

• When the three players start to tug against the individual, at first, he will move away from them and then eventually lose the game

Answer explanation

The question asks how the motion of an individual would change due to unbalanced forces. The correct answer is that when three players tug against the individual, initially, the individual will move away from them, indicating the influence of unbalanced force. Eventually, he will lose the game, suggesting the overpowering force from the three players.

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Which best describes the direction that gravity pull objects?

• Away from the Sun

• Towards the center of the Earth

• To the floor

• Towards the North Pole

Answer explanation

Gravity is a force that attracts two objects towards each other. In the context of the Earth, it pulls everything towards its center. Therefore, the statement that best describes the direction that gravity pulls objects is 'Towards the center of the Earth'. Other options are incorrect as gravity does not necessarily pull things away from the Sun, towards the North Pole, or simply to the floor.

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