Gravitational force is a fundamental force of nature. How is it calculated?

• By multiplying the masses of two objects and dividing by the square of the distance between them

• By adding the masses of two objects and dividing by the distance between them

• By multiplying the masses of two objects and the distance between them

• By adding the masses of two objects and the square of the distance between them

Frictional resistance is a force that opposes motion. Which of the following is an example of frictional resistance?

• A car's engine running

• A ball rolling on the ground

• A light bulb glowing

• A fan spinning

What is tractive effort and how is it applied in engineering?

• Tractive effort is the force exerted by a vehicle's wheels on the surface to propel it forward, and it is applied in engineering to design efficient propulsion systems.

• Tractive effort is the resistance faced by a vehicle while moving, and it is applied in engineering to calculate fuel efficiency.

• Tractive effort is the energy consumed by a vehicle's engine, and it is applied in engineering to improve engine performance.

• Tractive effort is the speed at which a vehicle travels, and it is applied in engineering to design aerodynamic vehicles.

Braking force is crucial in mechanical systems because it:

• increases the speed of the system

• reduces the speed or stops the system

• maintains the speed of the system

• has no effect on the system

• A spinning top

• A sliding box

• A falling stone

• A stationary car

The moment of inertia is significant in engineering because it:

• determines the resistance of an object to rotational acceleration.

• measures the amount of matter in an object.

• calculates the speed of an object.

• defines the color of an object.

Spring force is a type of force that is exerted by a spring when it is compressed or stretched. What role does it play in mechanical systems?

• It provides resistance to motion and stores potential energy.

• It generates electrical energy.

• It acts as a lubricant.

• It reduces friction between moving parts.

What is gravity?

• A) A contact force

• B) A non-contact force

• C) A magnetic force

• D) A frictional force

The force of gravity on earth is always equal to the _______ of the object.

• weight

• mass

• volume

• density

The equation W = mg represents the relationship between weight, mass, and gravitational acceleration. What does 'W' stand for in this equation?

• Weight

• Work

• Watt

• Width