10 Questions
What is the main reason why a machine cannot create work and/or energy?
Because it is governed by the law of conservation of energy
What happens to the input work when friction is present in a machine?
It increases
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
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
What is the efficiency of a machine that has an input work of 100 J and an output work of 80 J?
80%
What is the primary purpose of simple machines?
To multiply force
What is the mechanical advantage of a machine?
The ratio of resistance force to effort force
What is the relationship between the effort distance and resistance distance in a machine?
Effort distance is always greater than resistance distance
What is the input work in a machine?
The work done by the person on the machine
What is the relationship between the effort force and resistance force in a machine?
Resistance force is always greater than effort force
Learn about simple machines, including levers, pulleys, and inclined planes, and how they can multiply force. Understand the concept of conserved quantities in nature, such as momentum and energy, and how they differ from non-conserved quantities like force.
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