Work & Energy - Physics Fa20

Work & Energy - Physics Fa20

Good Things!

Then notes for Work & Energy!

Multiple Choice

Warm Up #1 Who wins the tug of war with what net force?

• The person on the left with 20 N

• The person on the left with 80 N

• The people on the right with 20 N

• The people on the right with 100 N

Multiple Choice

Warm Up #2 What is the net force?

• 3 N

• 3 N, right

• 17 N, right

• 3 N, left

Multiple Choice

Calculate the PE of a 2 kg cat perched 10 meters above the ground. 

• 20 J
• 200 J
• 2.04 J
• 200 W

Multiple Choice

Calculate the work needed to raise a 3 kg cat up to a height of
4 m.

• 12 J
• 0 J
• 120 J
• 1.22 J

Multiple Choice

A 10.0 kg box is accelerated from 2.0 m/s to 4.0 m/s.  What is the amount of work in joules needed to accelerate the box?

• 50.0
• 60.0
• 20.0
• 45.0

Multiple Choice

How much time is needed to produce 720 Joules of work if 90 watts of power is used? 

• 0.125 s
• 8 s
• 64800 s
• 80 s

Multiple Choice

W = 500 Joules 
t = 25 seconds
P = ???

• 0.05 W
• 20 W
• 12500 W
• 2000 W

Multiple Choice

How far does a car that weighs 5,000 N go if 18,000 J of work is done on it?

• 3.8 m
• 3.7 m
• 3.2 m
• 3.6 m

Multiple Choice

An Xbox consumes 15.7 watts while in standby mode. If you leave it in standby mode for 86,400 seconds (one day), how much work was done?

• 1,356,490 J
• 1,356,480 J
• 1,356,470 J
• 1,356,460 J