Test: Force, Energy & Work - 1 - Class 4 MCQ

Work is said to be done only when a push or pull moves something that has weight, through a distance.

• Muscular force is the force that helps us move things by using our muscles.
• When you push a heavy box, you are using muscular force from your arms.
• This force comes from the strength of your muscles.
• So, when you push or pull something, you are using your muscles to apply force.
• Isn't it cool how our muscles help us do so many things?

Riding a bicycle up a hill need more energy.

• Gravitational force is the force that pulls everything towards the earth.
• Imagine the earth is like a big magnet that pulls everything down towards it.
• This force is why things fall to the ground instead of floating in the air.
• So, when you drop something, like a ball, it comes down because of this gravitational force.

In a battery cell, energy stored is in the form of chemical energy.

Machines work when energy is provided to them and it does not produce energy.

The capacity to do work is called energy. Energy is available in different forms such as heat energy, light energy etc.

• The sun is like a big ball of fire in the sky. It gives us light and warmth every day.
• Plants use the light from the sun to make food, and this food gives us energy to do things like play and learn.
• So, the sun is a very important source of energy for us.
• It's like a big battery in the sky that keeps everything on Earth alive and moving.

When you walk on a smooth tiled floor with water on it, you might slip and slide easily. This is because the smooth surface combined with water makes it very slippery, so it's important to be careful and not run on such a floor to avoid falling down.

Friction helps us walk by providing grip between our feet and the ground. Without this grip from friction, we would slip and fall. So, friction between our feet and the ground is important for walking safely.

Stretching of a rubber band is an example of a pulling force.

The gravitational force of the earth pulls objects towards it.