Work and Machines

In order for work to be done on an object, the object must __________________.

• not move at all

• move some distance in the direction of the force applied to it

• move some distance in the opposite direction of the force applied to it

The rate at which work is done is called ____________.

• force

• mechanical advantage

• power

• efficiency

The force you exert on a machine is called

• input force

• output force

A machine's _______________ is the number of times the machine increases a force exerted on it.

• input force

• efficiency

• output force

• mechanical advantage

A machine can not change the ________________________.

• direction of the input force

• amount of work needed to do a task

• distance over which a force is applied

• amount of force needed to do a task

Answer explanation

You ALWAYS have to do the same amount of work! WORK NEVER CHANGES!!

Tags

NGSS.MS-ETS1-1

The mechanical advantage of a sledgehammer (multiplies force) is _____________________.

• equal to 1

• less than 1

• greater than 1

If the output force (OF) is greater than the input force (IF), the mechanical advantage (MA) will be _______________.

• equal to 1

• less than 1

• greater than 1

You hammer a nail into a wall

What is the input force?

• how far the nail goes into the wall

• the force you exert on the hammer

• the force the hammer exerts on the nail

• how far the hammer moves to hit the nail

Tags

NGSS.MS-PS2-2

If the output force (OF) is equal to the input force (IF), the mechanical advantage will be ____________________.

• equal to 1

• less than 1

• greater than 1

True or False:

A man would do more work if he pushes a box up a ramp faster.

• True

• False

Answer explanation

YOU ALWAYS DO THE SAME AMOUNT OF WORK!

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-5