Chapter 7.1 Form 3 Science

Which of the following shows work done?

• Pushing a wall

• Sitting on the floor

• Rowing a boat

• Reading a book in the class

Table shows the mass of four different loads which are being pushed in a trolley over a distance of 5m. Which of the following statements is correct.

• The work done by the trolley for load P is the biggest.

• The work done by the trolley for load R is the smallest.

• The work done by the trolley for load S is greater than for load Q.

• The work done by the trolley for load Q is smaller than for load P.

Diagram shows the sack of rice being pushed over a distance of 5m. Calculate the work done.

• 6J

• 60J

• 150J

• 1500J

Diagram shows Mary is rowing a boat. Calculate the distance travelled by the boat if the work done is 1500 J.

• 0.02 m

• 30 m

• 1450 m

• 75000 m

The work done by Ali to push a trolley for a distance of 30 m is 600 J. Calculate the force applied.

• 0.05 N

• 20 N

• 570 N

• 18000 N

The table shows the mass of four students who are asked to carry loads of different mass up a flight of stairs with a height of 5m. Who does the most work?

• Ali

• Abu

• Azman

• Akil

The table shows the mass of four students who are asked to carry loads of different mass up a flight of stairs with a height of 5m. Who does the most work?

• Ali

• Abu

• Azman

• Akil

A stuntman with a mass of 60kg had climbed up the roof of a building whihc is 50m tall. If the power used for this stunt is 6000 w, calculate the time take by the stuntman to complete this stunt.

• 0.5 s

• 1.2 s

• 2 s

• 5 s

A 200 N weight is lifted by Mazlan to a height of 1.5 m in 3 seconds. Calculate the power needed to lift the weight.

• 100 w

• 300 w

• 600 w

• 900 w

What is the S.I unit for work done?

• Newton

• Joule

• Watt

• Newton Meter