Dynamics - Newton's Laws of Motion Chapter 4

<p>Fictitious forces (D)</p> Signup and view all the answers

<p>Tension is slightly less than weight (B)</p> Signup and view all the answers

<p>Mass is constant regardless of location, while weight varies with gravity. (B)</p> Signup and view all the answers

<p>For every action, there is an equal and opposite reaction. (A)</p> Signup and view all the answers

<p>The net external force is equal to its weight. (B)</p> Signup and view all the answers

<p>The angle of the incline relative to the surface. (D)</p> Signup and view all the answers

<p>Tension must equal the weight of the supported mass in equilibrium. (C)</p> Signup and view all the answers

<p>It is determined by the incline's angle and gravity. (C)</p> Signup and view all the answers

<p>Ropes can only create tension. (B)</p> Signup and view all the answers

<p>A body at rest will remain at rest unless acted upon by a net force. (D)</p> Signup and view all the answers

<p>Mass is a measure of inertia, while weight is a measure of the force of gravity on an object. (A)</p> Signup and view all the answers

<p>An object with more mass has more inertia, making it harder to change its state of motion. (A)</p> Signup and view all the answers

<p>All objects in free-fall accelerate equal to the acceleration due to gravity, regardless of their mass. (C)</p> Signup and view all the answers

<p>The tension is equal to the gravitational force acting on the object. (C)</p> Signup and view all the answers

<p>The First Law requires a net external force for a change in motion, while the Second Law describes the effect of that force on acceleration. (B)</p> Signup and view all the answers

<p>Force equals mass multiplied by acceleration, or F = ma. (B)</p> Signup and view all the answers

<p>The net force is the sum of all forces acting on the object, regardless of direction. (D)</p> Signup and view all the answers

The net force acting on a mass being lifted is the difference between the tension (T) in the rope and the weight (w) of the mass, and is zero in equilibrium.

When a mass is supported by a rope and is stationary or moving at a constant velocity, the tension in the rope is equal to the weight of the mass.

When a mass is lifted with upward acceleration, the tension in the rope is greater than the weight of the mass.

When a mass is moving downwards with a downward acceleration, the tension in the rope is less than the weight of the mass.

A frame of reference where all forces are real and Newton's laws have simple forms.

The force of gravity acting on an object. It's a vector quantity, meaning it has both magnitude and direction. It always points downwards towards the center of the Earth.

A measure of the amount of matter in an object. It's a scalar quantity, meaning it only has magnitude.

When the only force acting on an object is its weight. This means the object is accelerating downwards due to gravity.

The force exerted by a surface on an object that is in contact with it. It acts perpendicular to the surface of contact.

For every action, there is an equal and opposite reaction. This means that when one object exerts a force on another, the second object exerts an equal and opposite force back on the first object.

The force transmitted through a rope, cable, or similar object when it is pulled tight. It acts in the direction of the rope.

The weight of an object on the Moon is less than on Earth because the Moon's gravitational acceleration is weaker. To calculate it, use the formula: Weight = Mass x Gravitational acceleration.

Friction opposes motion, so it reduces the acceleration of an object. If friction is present, the object will accelerate less than if it were absent.

The study of forces and how they affect the motion of objects. It's about why objects move, not just how they move.

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

The tendency of an object to resist changes in its motion. It's the property that makes objects 'want' to stay at rest or keep moving at the same speed and direction.

A push or pull that can cause an object to accelerate or change its state of motion. It has both magnitude and direction.

The acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass. F = ma.

The sum of all forces acting on an object. It determines the object's acceleration.

A force that acts on an object from outside its system. It can change the motion of the object.