Work, Force, Energy and Simple Machines Quiz

What is the formula for work?

• W = F / d * cos(θ)

• W = F * d * cos(θ)

• W = F * d + cos(θ)

• W = F + d * cos(θ)

Define work in the context of physics.

• The color of an object

• The temperature of an object

• The product of the force applied to an object and the distance over which the force is applied.

• The speed of an object

Calculate the work done when a force of 20N is used to move an object 5m.

• 100J

• 10J

• 50J

• 200J

What is the unit of force?

• Newton (N)

• Kilogram (kg)

• Watt (W)

• Joule (J)

State Newton's first law of motion.

• An object at rest will start moving on its own

• An object in motion will change direction without any force

• An object at rest will stay at rest, and an object in motion will stay in motion with the same speed and in the same direction unless acted upon by an unbalanced force.

• An object in motion will eventually come to a stop

Calculate the force required to accelerate a 500kg object at 5m/s^2.

• 2500N

• 1000N

• 3000N

• 5000N

What is the formula for kinetic energy?

• mass + velocity^2

• 1/2 * mass * velocity

• mass * velocity^2

• 1/2 * mass * velocity^2

Explain the concept of potential energy.

• Potential energy is the energy that an object possesses due to its position or state.

• Potential energy is the energy that an object possesses due to its temperature

• Potential energy is the energy that an object possesses due to its color

• Potential energy is the energy that an object possesses due to its speed

Name two types of simple machines.

• Inclined plane and wedge

• Screw and wheel

• Gear and axle

• Lever and pulley

How does a lever make work easier?

• By reducing the distance over which a force is applied

• By increasing the amount of force needed to move a load

• By making it more difficult to move heavy objects

• By allowing a smaller force to move a larger load over a greater distance.