Physics First Semester Final Exam

Front

What is the total net work done on an object that is lifted and then returned to the same position?

Back

0 J - The total net work is zero because the work done in lifting is equal and opposite to the work done in lowering.

Front

What is impulse in physics?

Back

Impulse is the change in momentum of an object when a force is applied over a period of time, calculated as the product of force and the time duration.

Front

How do you calculate momentum?

Back

Momentum (p) is calculated using the formula p = mass (m) × velocity (v).

Front

What is the SI unit of velocity?

Back

meter/second (m/s) - It measures the distance traveled per unit of time.

Front

What does a constant speed to the right imply about the forces acting on an object?

Back

If an object is moving to the right at a constant speed, the net force acting on it is zero, meaning all forces are balanced.

Front

Define work in physics.

Back

Work is defined as the product of the force applied to an object and the distance over which that force is applied, in the direction of the force.

Front

What is the relationship between work and energy?

Back

Work done on an object results in a change in energy; specifically, it can increase the object's kinetic or potential energy.

Front

What is the formula for calculating work?

Back

Work (W) = Force (F) × Distance (d) × cos(θ), where θ is the angle between the force and the direction of motion.

Front

What is the principle of conservation of momentum?

Back

The total momentum of a closed system remains constant if no external forces act on it.

Front

What is the difference between elastic and inelastic collisions?

Back

In elastic collisions, both momentum and kinetic energy are conserved; in inelastic collisions, momentum is conserved but kinetic energy is not.