Physics_A_062425

What does Newton’s first law of motion state?

• An object will accelerate if a force is applied.

• An object at rest stays at rest, and an object in motion stays in motion at constant velocity unless acted upon by a net external force.

• For every action, there is an equal and opposite reaction.

• Force equals mass times acceleration.

A car suddenly stops, and the passengers lurch forward. This is best explained by:

• Gravity

• Inertia

• Friction

• Acceleration

Which of the following is a real-world example of Newton’s first law?

• A rocket accelerating in space

• A satellite orbiting Earth at constant speed

• A ball rolling on a smooth surface and eventually stopping

• All of the above

Why does a hockey puck eventually stop sliding on ice, even though Newton’s first law says it should keep moving?

• Because of gravity

• Because of friction between the puck and the ice

• Because of inertia

• Because of air resistance only

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What is inertia?

• The tendency of an object to change its motion

• The tendency of an object to resist changes in its motion

• The force that moves objects

• The acceleration of an object

A satellite in space continues to move in a straight line at constant speed. This is an example of:

• Acceleration

• Inertia

• Gravity

• Friction

Which safety device in a car is designed to protect passengers by using the concept of inertia?

• Airbags

• Windshield wipers

• Headlights

• Radio

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If a rocket in space runs out of fuel, what will happen to its motion (ignoring gravity and other forces)?

• It will stop immediately

• It will continue moving at constant velocity

• It will accelerate

• It will move in a circle

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If no net force acts on a moving object, what will happen to its velocity?

• It will increase

• It will decrease

• It will remain constant

• It will reverse direction