Forces and Motion Quiz Review

Which of the following is an example of a force that causes an object to move?

• Friction

• Gravity

• Inertia

• Mass

Answer explanation

Gravity is a force that pulls objects toward each other, causing them to move. Unlike friction, which opposes motion, or inertia and mass, which describe an object's resistance to change, gravity actively causes movement.

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What happens to a ball when you apply a greater force to it?

• It moves slower

• It moves faster

• It stops moving

• It changes color

Answer explanation

When a greater force is applied to a ball, it accelerates according to Newton's second law of motion (F=ma). This means it moves faster, making 'It moves faster' the correct choice.

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If two objects are pushed with the same force, which one will move less?

• The object with more mass

• The object with less mass

• Both will move the same

• The object with more surface area

Answer explanation

According to Newton's second law, F = ma, where F is force, m is mass, and a is acceleration. If two objects are pushed with the same force, the object with more mass will have less acceleration, thus it will move less.

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Why does a book not move when you push it gently on a table?

• Because the book is too heavy

• Because the table is smooth

• Because of balanced forces

• Because of gravity

Answer explanation

The book does not move when pushed gently because the forces acting on it are balanced. The push force is countered by static friction and the weight of the book, resulting in no net force to cause movement.

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Describe what happens when you push a toy car harder compared to a gentle push.

• The car moves slower

• The car moves faster

• The car changes direction

• The car stops

Answer explanation

When you push a toy car harder, you apply more force, which increases its acceleration. This results in the car moving faster compared to a gentle push, which applies less force and leads to slower movement.

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Explain why a heavier object requires more force to move than a lighter object.

• Because it has more friction

• Because it has more mass

• Because it is larger

• Because it is denser

Answer explanation

A heavier object requires more force to move because it has more mass. According to Newton's second law, force equals mass times acceleration (F=ma), so greater mass results in a greater force needed to achieve the same acceleration.

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Investigate the effect of gravity on a falling object. What do you observe?

• The object falls slower

• The object falls faster

• The object stays in place

• The object moves sideways

Answer explanation

The object falls faster due to the force of gravity acting on it, causing it to accelerate towards the ground. This acceleration increases its speed as it falls, contrary to the other options.

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What happens when two forces acting on an object are equal and opposite?

• The object moves in the direction of the stronger force

• The object moves in the direction of the weaker force

• The object does not move

• The object spins

Answer explanation

When two forces are equal and opposite, they cancel each other out, resulting in no net force. Therefore, the object does not move.

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A student pushes a box across the floor. If the box is heavy, what must the student do to keep it moving?

• Apply less force

• Apply more force

• Stop applying force

• Apply the same force

Answer explanation

To keep a heavy box moving, the student must apply more force to overcome inertia and friction. If the force applied is insufficient, the box will not continue to move.

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An unbalanced force is when objects move in one direction because the force is greater from that direction.

• true

• false

Answer explanation

True. An unbalanced force causes an object to accelerate in the direction of the greater force, resulting in movement. This aligns with the definition provided in the question.

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