Physical Science Module 4-1 Work and Energy

Multiple Choice

Which of the following best describes acceleration?

• The speed and direction of a moving object.

• The change in speed or velocity over time.

• A push or pull that changes the state of motion of an object.

• The distance traveled per unit time.

Multiple Choice

Which of the following best describes the difference between velocity and acceleration?

• Velocity is the speed and direction of a moving object, while acceleration is the change in speed or velocity over time.

• Velocity is the force applied to an object, while acceleration is the distance traveled.

• Velocity is measured in Newtons, while acceleration is measured in meters per second.

• Velocity is the change in time, while acceleration is the change in displacement.

Open Ended

How do the concepts of velocity, acceleration, and force relate to each other in understanding the motion of objects?

Multiple Choice

Which of the following best defines 'work' in physical science?

• Work is the force exerted on an object that causes it to move some distance.

• Work is the amount of energy stored in an object.

• Work is the speed at which an object moves.

• Work is the mass of an object multiplied by its acceleration.

Multiple Choice

Why does the person pushing the 300kg ball for 10 seconds do no work, while the person pushing the 100kg ball for 5 seconds does work?

• Because work requires movement over a distance, and the 300kg ball did not move.

• Because the force applied was not enough for the 300kg ball.

• Because the time spent pushing determines the work done.

• Because the mass of the ball is more important than the distance moved.

Open Ended

Explain the difference between work and power using examples from the images provided.

Multiple Choice

Which of the following statements about horsepower is correct?

• 1 horsepower is equal to 746 watts.

• 1 horsepower is equal to 550 watts.

• 1 horsepower is equal to 1000 watts.

• 1 horsepower is equal to 1 watt.

Multiple Choice

Which of the following is NOT a way a machine makes work easier?

• By changing the amount of force

• By changing the distance covered

• By changing the direction of the force

• By increasing the speed of work

Multiple Select

Select all statements that are true about the efficiency of a machine:

• Efficiency is always less than 100% due to friction.

• Efficiency is calculated as output work divided by input work times 100.

• Efficiency has no units.

• Efficiency is always equal to mechanical advantage.

Open Ended

Explain the differences between a wedge, a screw, and an inclined plane as types of simple machines.

Multiple Choice

Which of the following is an example of an inclined plane?

• A ramp used to move boxes

• A pulley lifting a weight

• A wheel and axle system

• A lever used to pry open a lid

Open Ended

Explain how a wedge is related to an inclined plane and provide an example from everyday life.

Multiple Select

Which of the following are examples of levers?

• Scissors

• Ramp

• Crowbar

• Pulley

Multiple Choice

What is the main function of the wheel and axle in simple machines?

• To increase rotational force

• To convert rotational force to linear force

• To lift heavy objects vertically

• To attach two objects together

Open Ended

Describe how a pulley system makes lifting heavy objects easier. Use examples from the image to support your answer.

Multiple Choice

Which of the following best describes the difference between kinetic energy and potential energy?

• Kinetic energy is the energy of motion, while potential energy is stored energy due to position.

• Kinetic energy is stored energy, while potential energy is the energy of motion.

• Kinetic energy and potential energy are both forms of chemical energy.

• Kinetic energy only exists in living things, while potential energy exists in non-living things.

Open Ended

Explain how elastic potential energy and gravitational potential energy differ in terms of how they are stored and what factors affect them.

Multiple Choice

Which of the following factors will cause the greatest increase in an object's kinetic energy?

• Doubling the object's mass

• Doubling the object's velocity

• Halving the object's mass

• Halving the object's velocity

Multiple Select

Select all forms of energy that are associated with the movement of particles or waves.

• Thermal Energy

• Radiant Energy

• Chemical Energy

• Mechanical Energy

Open Ended

Describe a real-life example where energy is converted from one form to another, and explain the forms of energy involved in the process.

Open Ended

Name 3 renewable and 3 non-renewable energy sources.