LESSON 7.1: WORK, ENERGY & POWER

LESSON 7.1: WORK, ENERGY & POWER

Multiple Choice

RECALL 1: The ability to pull and push an object is known as ...............

• power

• force

• energy

• work

Multiple Choice

Which of the following is NOT the effect of force?

• Change direction

• Reduce or increase speed

• Change shape

• Stationary object

Multiple Choice

Which of the following is NOT a type of force?

• Gravitational

• Normal

• Frictional

• Magnetic

• Solar

Multiple Choice

RECALL 4: What is the S.I. unit for force?

• Gram (g)

• Newton (N)

• Kelvin (K)

• Meter (m)

Multiple Choice

What is the value of force for a 1 kg object?

• 1 Newton

• 10 Newton

• 100 Newton

• 1000 Newton

Multiple Choice

Work done is defined as the product of force and displacement in a direction of force.

• TRUE

• FALSE

Multiple Choice

What is the formula for work (W)?

• Work (W) = Force (F) X Displacement (s)

• Work (W) = Force (F) X Time (s)

• Work (W) = Force (F) / Displacement (s)

Multiple Choice

Work is defined as the product of force and displacement in the direction of the force. What is meant by DISPLACEMENT?

• Stationary distance

• Change location

• Magnitude of force

• Distance moved

Multiple Select

Work is considered done when the following are happening.

• Force exerted

• Static object

• Moved distance

• Time taken

Multiple Choice

What is the S.I. unit for work?

• Watt (W)

• Volt (V)

• Joule (J) or Newton meter (Nm)

• Amphere (A)

Multiple Choice

State the direction of the force.

• Vertical (ke atas)

• Horizontal (Melintang)

Multiple Choice

State the direction of the force.

• Vertical

• Horizontal

Multiple Select

Select ALL the activities that show work is done.

Multiple Choice

Joey is pushing a box up a ramp a distance of 5 meters with a force of 34 Newtons. Calculate the amount of work done.

• 170 J

• 215 J

• 39 J

• 7 J

Multiple Choice

John is pulling a box across the floor a distance of 5 meters with a force. Calculate the force needed if the amount of work done is 250 J.

• 1250 N

• 245 N

• 255 N

• 50 N

Multiple Choice

Based on the diagram, calculate work done.

• 0 J

• 100 J

• 1000 J

• Infinity J

Multiple Choice

If Kamal and Ah Kit started together at the ground level, who has the higher POWER?

• Kamal

• Ah Kit

Multiple Choice

Energy is the ability to do work (Joule).

• TRUE

• FALSE

Multiple Choice

POWER is defined as the rate of doing work.

• TRUE

• FALSE

Multiple Choice

Which of the following is the correct formula for POWER?

• Power (P) = Force (F) / Displacement (s)

• Power (P) = Work (W) X Time (s)

• Power (P) = Work (W) / Time (s)

Multiple Choice

What is the S.I. unit for POWER?

• Watt (W)

• Joule (J)

• Newton meter (Nm)

• Meter per second (m/s)

Multiple Choice

A tired squirrel (mass of approximately 1 kg) does running by 5 m in order to do a mere 50 J of work. If the tired squirrel does all this work in 2 seconds, then determine its power.

• 25 W

• 0.25 W

• 50 W

• 100 W

Multiple Choice

The olympian could lift up the weight of 2000 Newton for the height of 2 meter in 4 seconds. Calculate the POWER?

• 1000 W

• 100 W

• 4000 W

• 1600 W

Fill in the Blanks

Poll

Congratulations! You have completed the lesson. What do you think of today's lesson?

• Really happy

• Quite happy

• Not sure

• I must repeat