t-lvl yr 1 mechanical science principles

What is the unit of mass in the formula W = mg?

• Newtons (N)

• Kilograms (kg)

• Meters (m)

• Seconds (s)

Which of the following is a correct formula for work when including mass and gravity?

• work = mass + gravity + distance

• work = mass × gravity × distance

• work = mass / gravity / distance

• work = mass - gravity - distance

What does the formula "work = mass × gravity × distance" help determine?

• The speed of an object

• The force exerted on an object

• The energy consumption

• The temperature change

What is the relationship between kinetic and potential energy when a mass is raised to a fixed height ?

• Kinetic energy is converted to potential energy

• Potential energy is converted to kinetic energy

• Both energies remain constant

• Both energies decrease

What does the law of conservation of energy state?

• Energy can be created and destroyed.

• Energy can only be transformed from one form to another.

• Energy is always lost in mechanical processes.

• Energy is only used in electrical systems.

What is the formula for calculating efficiency?

• % efficiency = (input power / output power) × 100

• % efficiency = (output power / input power) × 100

• % efficiency = (output power + input power) × 100

• % efficiency = (input power - output power) × 100

If the output power is 100 and the input power is 220, what is the efficiency?

• 45.5%

• 50%

• 55%

• 60%

What is the term for energy turned into unwanted forms like noise or heat?

• Energy conversion

• Energy transformation

• Energy losses

• Energy gains

Which of the following is an example of energy transformation?

• Electricity to light

• Heat to sound

• Sound to electricity

• Light to heat

What happens when your weight pushes down on the floor?

• The floor moves away

• The floor pushes up against you with an equal force

• The floor absorbs the weight

• The floor changes color