Understanding Work and Simple Machines

What is required for work to be done according to physics?

• A force must be applied.

• An object must move due to a force.

• A person must feel tired.

• A task must take a long time.

Which requires more work: throwing a baseball or a large rock the same distance?

• Throwing a baseball

• Throwing a large rock

• Both require the same work

• It depends on the thrower

How do simple machines affect the amount of work done?

• They increase the force needed to do the work.

• They decrease the total work done.

• They increase the total work done.

• They decrease the force needed to do the work.

What is an inclined plane an example of?

• A complex machine

• A simple machine

• A mechanical advantage

• A force multiplier

What does mechanical advantage allow a simple machine to do?

• Reduce the distance an object moves

• Increase the effort required

• Multiply the force exerted on it

• Decrease the total work done