T4 L3 Newton's Laws of Motion

What is the effect on a puck when a hockey player hits it on the ice?

• It remains stationary

• It changes color

• Its motion changes

• It melts

Answer explanation

When a hockey player hits a puck on the ice, the force applied changes its motion, causing it to slide or accelerate. The other options, such as remaining stationary or changing color, do not accurately describe the effect of the hit.

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What does Newton's first law of motion state about an object at rest?

• It will start moving on its own.

• It will remain at rest unless acted upon by a nonzero net force.

• It will move in a circular path.

• It will change its shape.

Answer explanation

Newton's first law states that an object at rest will remain at rest unless acted upon by a nonzero net force. This means it will not start moving on its own, confirming the correct choice.

What is required to change the motion of an object according to Newton's first law?

• A change in temperature.

• A nonzero net force.

• A change in color.

• A decrease in mass.

Answer explanation

According to Newton's first law, an object will remain at rest or in uniform motion unless acted upon by a nonzero net force. Therefore, a nonzero net force is required to change the motion of an object.

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What will happen if there is a net force acting on an object?

• It will remain at rest.

• It will accelerate.

• It will change color.

• It will shrink.

Answer explanation

According to Newton's second law, a net force acting on an object causes it to accelerate in the direction of the force. Therefore, the correct answer is that it will accelerate.

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What did Newton figure out after describing the connection between inertia and mass?

• How to calculate speed

• How to find the acceleration of an object when a force acted on it

• How to measure weight

• How to determine the volume of an object

Answer explanation

Newton established that the acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass, leading to the formulation of his second law of motion: F=ma.

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What does inertia explain in everyday life?

• Why objects fall

• Why seat belts and airbags are used

• Why the sky is blue

• Why plants grow

Answer explanation

Inertia explains why seat belts and airbags are essential for safety. They help prevent passengers from continuing to move forward in a crash, demonstrating how objects in motion tend to stay in motion unless acted upon by an external force.

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According to Newton's second law, what affects the acceleration of an object?

• The color of the object.

• The shape of the object.

• The mass and net force on the object.

• The temperature of the object.

Answer explanation

According to Newton's second law, acceleration is directly proportional to the net force acting on an object and inversely proportional to its mass. Thus, the correct choice is 'The mass and net force on the object.'

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What does the term 'derived' mean in the context of calculating acceleration?

• Created from scratch.

• Obtained from a formula.

• Ignored in calculations.

• Multiplied by a constant.

Answer explanation

In the context of calculating acceleration, 'derived' means that the value is obtained from a formula, such as using the change in velocity over time. This highlights the importance of mathematical relationships in physics.

What does Newton's second law help to understand about motion?

• The color of objects.

• The speed of light.

• The relationship between force, mass, and acceleration.

• The temperature of objects.

Answer explanation

Newton's second law explains how the force acting on an object relates to its mass and the acceleration it experiences. This relationship is fundamental to understanding motion, making the correct choice the relationship between force, mass, and acceleration.

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What is the force required to give a 1-kg mass an acceleration of 1 m/s²?

• 1 N

• 2 N

• 0.5 N

• 10 N

Answer explanation

To find the force, use Newton's second law: F = m * a. Here, m = 1 kg and a = 1 m/s². Thus, F = 1 kg * 1 m/s² = 1 N. Therefore, the required force is 1 N.

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