Understanding Machines

Machines are devices that allow you to do _______________ in an easier way.

• force
• work

The force you exert when you use a machine is the ________________.

• output force
• input force

The force exerted by the machine is the ____________.

• output force
• input force

The force exerted on an object multiplied by the distance the object moves is equal to ____________, which is expressed in joules.

• force
• work

Divide output work by input work and multiply by 100% to find a machine's _______________.

• effiency
• mechanical advantage

A machine's mechanical advantage is the output force MULTIPLIED by the input force. 

• True
• False

If the output force is greater than the input force, the mechanical advantage of the machine is GREATER THAN one.

• True
• False

If the machine increases distance, the output force is GREATER THAN the input force.

• True
• False

If a machine changes the direction, but not the amount of input force, the mechanical advantage is GREATER THAN 1.

• True
• False

An ideal machine has NO friction.

• True
• False