Force, Work & Energy

A force can:

• Change the shape of an object

• Move an object

• Stop a moving object

• Change the speed of a moving object

A balloon popping and a music system is an example of which energy?

• Sound Energy

• Heat Energy

• Electrical Energy

Define Muscular Energy:-

• The force exerted by a magnet

• The force applied by the muscles

• Force that acts on an object to slow it down

Force is a:-

Modern Elevator is an example of:-

• Screw

• Wedge

• Pulley

• Inclined Plane

What are the three sources of energy?

Honey kicked a football, it started rolling on the ground in the direction of the force applied by her for some time and then it stopped.

Now answer the following questions-

1. Is the work done?

2. Name the force due to which the football stops rolling.

• 1.No, 2.Gravitational Force

• 1.Yes, 2. Muscular force

• 1. No, 2. Magnetic force

• 1. Yes, 2. Frictional force

An example of Wheel and Axle is-

• Bottle opener

• Doorknob

• Knife

• Slide

Work = ___________ x _______________

• Work = force x distance

• None

While ironing your clothes, ___________ energy is converted to ____________ energy

• Electrical energy is converted to Chemical Energy

• Sound energy is converted to Heat energy

• Heat energy is converted to Electrical energy

• Electrical energy is converted to Heat energy