PS Unit 4 Review

Where should the fulcrum be located in this lever to get the greatest mechanical advantage?

• I

• II

• III

• IV

Scissors has a fulcrum between the handle and the blades, giving them two simple machines in one, which are the ​ (a)   and a ​ (b)   ​

• lever

• wedge

• inclined plane

• wheel and axle

• pulley

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

A shovel and a trowel contains two simple machines, which are the ​ (a)   and ​ (b)  

• lever

• wedge

• handle

• pulley

• inclined plane

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

Simple machines are used to reduce the ________

• work

• force

• distance

• power

Amy uses 20N of force to push a lawn mower 10 meters. How much work does she do?

• 2J

• .5J

• 200J

• 200 watts

Tags

NGSS.MS-PS2-2

The lawnmower has a motor instead of just blades, so that the person can _______________.

• get less work done in the same time

• get the same work done in same amount of time

• get a longer amount of time in a shorter distance

• get the same amount of work done in less time

Charlie does 15 Joules of work to push the pencil over 1 meter. How much force did he use?

• 0N

• 15 watts

• 15J

• 15N

Tags

NGSS.MS-PS2-2

Angela uses a force of 25 Newtons to lift her grocery bag while doing 50 Joules of work. How far did she lift the grocery bags?

• 1,250m

• 2m

• .5J

• 2J

Tags

NGSS.MS-PS2-2

Work is done when an object moves through a ​ ​ (a)   because of a ​ (b)   acting upon the object

• distance
• force
• energy
• work
• power

Tags

NGSS.MS-PS3-5

A task lasted 40 seconds and required 2,000 J of work to complete. How much power was used?

• 50W

• 50J

• .02W

• 80,000J