Physics Chapter on Mechanics

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What is the definition of inertia?

The property of a body to remain in its current state unless acted upon by an external force. (correct)

A measurable physical quantity that describes resistance to motion.

The ability to change speed without any net force acting upon it.

A force that causes acceleration depending on the mass of an object.

Which equation best represents Newton's second law of motion?

F = ∫Fdt

F = dp/dt

F = m(v_f - v_i)

F = ma (correct)

When is an object said to be in static equilibrium?

When the sum of all forces acting on it is less than zero.

When it has a net force greater than zero.

When it is at rest or moving with constant velocity. (correct)

When it experiences acceleration.

What does the impulse-momentum theorem state?

Impulse is equal to the change in momentum of an object. Signup and view all the answers

How does Newton’s third law of motion describe forces?

For every action, there is an equal and opposite reaction. Signup and view all the answers

What does the conservation of momentum principle state?

For a closed system, the total amount of momentum remains constant if no external forces act on it. Signup and view all the answers

In the context of a spring force, what does the equation $f_{spring} = kx$ represent?

The restoring force is proportional to the displacement from the mean position. Signup and view all the answers

What is the significance of a free body diagram (F.B.D)?

It identifies and illustrates all the forces acting on a body. Signup and view all the answers

What is the relationship between the exhaust velocity and net force acting on a rocket during fuel consumption?

Fnet is affected by both the exhaust velocity and gravitational force. Signup and view all the answers

In a gun-bullet system, what condition leads to the recoil of the gun?

The conservation of momentum in the system. Signup and view all the answers

How does static friction differ from kinetic friction in terms of motion?

Static friction can adjust itself up to a limit before motion starts. Signup and view all the answers

What is the effect of gravitational acceleration on the normal force in a lift during free fall?

Normal force becomes zero during free fall. Signup and view all the answers

When calculating tension in a pulley system, what variable does not directly affect the tension experienced by the ropes in a balanced system?

The distance between the blocks. Signup and view all the answers

What happens to the net force when the combined force applied exceeds the total limiting friction in a two-block system?

The blocks will accelerate based on the excess force. Signup and view all the answers

In a block-over-block scenario, if the maximum acceleration $a_{max}$ is greater than the applied acceleration $a$, what occurs?

Both blocks will move with the same acceleration. Signup and view all the answers

Which of the following statements regarding pseudo forces is correct?

Pseudo forces act in non-inertial frames opposite to the direction of acceleration. Signup and view all the answers