Understanding Force, Work, and Energy

What is the unit of force in the International System of Units (SI)?

• Pound

• Newton

• Joule

• Watt

Which of the following best describes the concept of work in physics?

• The rate at which energy is transferred

• The force applied over a distance

• The energy stored in an object

• The resistance to motion

If a force of 10 Newtons is applied to move an object 5 metres, how much work is done?

• 2 Joules

• 15 Joules

• 50 Joules

• 100 Joules

Which of the following equations correctly represents the relationship between force, mass, and acceleration?

• 19.6 Joules

• 98 Joules

• 196 Joules

• 392 Joules

Which of the following is an example of kinetic energy?

• A compressed spring

• A moving car

• A charged battery

• A book on a shelf

How is power defined in terms of work and time?

• Power is the product of work and time

• Power is the difference between work and time

• Power is the work done per unit time

• Power is the sum of work and time

Which of the following statements is true about energy conservation in a closed system?

• Energy can be created or destroyed

• Energy can be transformed from one form to another

• Energy is always lost as heat

• Energy is only conserved in mechanical systems

A machine has an efficiency of 75%. If it requires 200 Joules of input energy, how much useful work does it perform?

• 50 Joules

• 100 Joules

• 150 Joules

• 175 Joules

Which of the following best describes the concept of mechanical advantage?

• The ratio of output force to input force

• The sum of input and output forces

• The difference between input and output forces

• The product of input and output forces