FORCE WORK & ENERGY

Identify the simple machine in the given image.

• Wedge

• Wheel & Axle

• Pulley

• Inclined Plane

The 2 simple machines being used in the image are

• wheel & axle, inclined plane

• wedge, pulley

• inclined plane, lever

• wedge, lever

The energy conversation from 2 to 1 is

• chemical energy to potential energy

• kinetic energy to potential energy

• potential energy to kinetic energy

• kine energy to chemical energy

Which of the following is/are non-contact force(s)?

• Elastic Force

• Gravitational Force

• Magnetic Force

• All of these

In which of the following work is NOT done?

• 
• 
• 
• All of these

State True or False.

1. Gravity supports in climbing hills.
2. Shadow is the longest at noon.
3. Shadows are light coloured at nights.

• T, F, T

• T, T, T

• F, F, T

• F, F, F

Which of the following is/are translucent?

• Butter paper

• Tracing paper

• Frosted glass

• All of these

Which thing is NOT required to form a shadow?

• Screen

• Transparent object

• Light Source

• Opaque object

State True or False.

1. Sound is a form of energy.
2. Sound travels in straight line.
3. Translucent objects form a dark shadow.

• T, F, F

• T, F, T

• T, T, F

• F, F, F

Which of the following is an unpleasant sound?

• Chirping of birds

• Soft music

• Crying of child

• Singer singing in tune