Match the Following: Column a Column B (A) Needle (1) Class Ii Lever (B) Door Knob (2) Inclined Plane (C) Ramp (3) Class I Lever (D) Lemon Crusher (4) Wheel and Axle (E) See Saw (5) Wedge - Physics

Match the following:

जोड्या लावा/जोड्या जुळवा

shaalaa.com

या प्रश्नात किंवा उत्तरात काही त्रुटी आहे का?

पाठ 4: Simple Machines - Objective questions

पाठ 4 Simple Machines
Objective questions | Q 3

Write true or false of the following statement.

A gum bottle lying on a table has no energy.

Fill in the blank

Cooking gas converts _______ energy into heat energy.

Select the correct alternatives

When a bulb lights up on passing current, the change of energy is

What do you mean by conservation of mechanical energy? State the condition when does it hold.

Answer the following in short.

What do you understand by the term efficiency of a machine’?

Take two aluminium channels of different lengths.
Place the lower ends of the channels on the floor and hold their upper ends at the same height.
Now take two balls of the same size and weight and release them from the top end of the channels. They will roll down and cover the same distance.

At the moment of releasing the balls, which energy do the balls have?
As the balls roll down which energy is converted into which other form of energy?
Why do the balls cover the same distance on rolling down?
Note: The question is wrong. It should be "Why do the balls cover the same distance after rolling down"?
What is the form of the eventual total energy of the balls?
Which law related to energy does the above activity demonstrate? Explain.

Observe the picture and put a tick (✓) if work is done and put a cross (x) if work is not done.