Newton's Laws of Motion Day 2

A 20 kg bike accelerates at 10 m/s².  what was the force?

• 25 Newtons

• 20 Newtons

• 200 Newtons

• 10 Newtons

Answer explanation

To find the force, use Newton's second law: F = m * a. Here, m = 20 kg and a = 10 m/s². Thus, F = 20 kg * 10 m/s² = 200 N. Therefore, the correct answer is 200 Newtons.

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A student pushes a box to right with a force of 10N while a young boy pushes the box to the left with a force of 8N. What is the sum of all forces on the box? 

• 18N left

• 18N right

• 2N right

• 2N left

Answer explanation

The net force is calculated by subtracting the left force from the right force: 10N (right) - 8N (left) = 2N (right). Therefore, the sum of all forces on the box is 2N to the right.

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If net force acting on object is 0, then the force is considered to be..

• Balanced

• Unbalanced

• Equal in Direction

• Distance/Time

Answer explanation

If the net force on an object is 0, it means that all forces acting on it are equal in magnitude and opposite in direction, resulting in no change in motion. This condition is known as balanced forces.

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What is Newton's First Law known as? The Law of

• Friction

• Mass

• Inertia

• Gravity

Answer explanation

Newton's First Law is known as the Law of Inertia. It states that an object at rest stays at rest, and an object in motion stays in motion unless acted upon by an external force, highlighting the concept of inertia.

Which of Newton's laws is illustrated when a magician pulls a tablecloth out from under the dishes without disturbing them?

• first

• second

• third 

• fourth

Answer explanation

The magician's action demonstrates Newton's first law, which states that an object at rest stays at rest unless acted upon by an external force. The dishes remain undisturbed because the force applied to the tablecloth is insufficient to move them.

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When a cannon fires a cannonball we observe Newton's third law. Which force is the reaction force?

• The cannon moving forward

• The cannonball moving forward

• The cannon moving backward

• The cannonball moving backward

Answer explanation

According to Newton's third law, for every action, there is an equal and opposite reaction. When the cannon fires the cannonball forward, the reaction force is the cannon moving backward.

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The English Scientist who developed three laws of motion was called:

• Sir Isaac Newman

• Sir Isaac Newton

• Albert Einstein

• Mr. Fig Newton

Answer explanation

The correct answer is Sir Isaac Newton, who formulated the three laws of motion that describe the relationship between a body and the forces acting on it. The other options are incorrect or fictional.

A rocket pushes burning gases DOWN which causes the rocket to launch UP. Which law is this?

• Newton's 1st Law of Motion

• Newton's 2nd Law of Motion

• Newton's 3rd Law of Motion

• Newton's 0th Law of Gravity

Answer explanation

This scenario illustrates Newton's 3rd Law of Motion, which states that for every action, there is an equal and opposite reaction. The rocket pushes gases down, resulting in an upward thrust.

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It is much more difficult to move a dresser full of clothes than an empty dresser.

• Newton's 1st Law of Motion

• Newton's 2nd Law of Motion

• Newton's 3rd Law of Motion

Answer explanation

Newton's 2nd Law of Motion states that force equals mass times acceleration (F=ma). A full dresser has more mass, requiring more force to move it compared to an empty one, illustrating this law.

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A skateboarder pushes the ground BACKWARDS which causes the board to move FORWARD.

• Newton's 1st Law of Motion

• Newton's 2nd Law of Motion

• Newton's 3rd Law of Motion

Answer explanation

According to Newton's 3rd Law of Motion, for every action, there is an equal and opposite reaction. The skateboarder pushes backward on the ground, and in response, the ground pushes the skateboard forward.

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