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Simple Machines and Conservation of Energy

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Simple Machines and Conservation of Energy

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Questions and Answers

What is the main reason why a machine cannot create work and/or energy?

Because it is frictionless

Because it is a simple machine

Because it is governed by the law of conservation of energy (correct)

Because it is a mechanical advantage

What happens to the input work when friction is present in a machine?

It increases (correct)

It becomes negative

It remains the same

It decreases

What is the relationship between the mechanical advantage (MA) found by the ratio of forces and the MA found by the ratio of distances?

The MA found by the ratio of forces is always less than the MA found by the ratio of distances (correct)

The MA found by the ratio of forces is always greater than the MA found by the ratio of distances

They are always opposite

They are always equal

What is the purpose of a machine in terms of force and distance?

To play with the relative sizes of the forces and the distances Signup and view all the answers

What is the efficiency of a machine that has an input work of 100 J and an output work of 80 J?

80% Signup and view all the answers

What is the primary purpose of simple machines?

To multiply force Signup and view all the answers

What is the mechanical advantage of a machine?

The ratio of resistance force to effort force Signup and view all the answers

What is the relationship between the effort distance and resistance distance in a machine?

Effort distance is always greater than resistance distance Signup and view all the answers

What is the input work in a machine?

The work done by the person on the machine Signup and view all the answers

What is the relationship between the effort force and resistance force in a machine?

Resistance force is always greater than effort force Signup and view all the answers