Energy IPC Test Review

What is work measured in?

• Newtons

• Joules

• Meters

• Watts

What is the formula for work? Use A = AxA or B = B/B

1 joule equals?

• 1 newton x 1 meter

• 10 newtons

• 10 joules minus 8 joules

• a nuclear bomb

A dancer lifts a 40 kg ballerina 1. 4 m in the air and walks forward 2.2 m. How much work is done on the ballerina during and after the lift?

• 554.4 J
• 432.6 J
• 678.2 J
• 548.8 J

A construction worker lifts a 60 kg load vertically 2.5 meters using a pulley system and then moves horizontally for 3.0 meters while carrying the load. Assuming negligible friction, calculate the total work done on the load during and after the lift

• 490 J

• 2205 J

• 4410 J

• 1470 J

Answer explanation

you do not use the horizontal movement because the motion is a big fat ZERO

"A car engine applies a force of 500 Newtons to accelerate a car from rest to a speed of 20 meters per second over a distance of 50 meters. Calculate the total work done by the engine during this acceleration."

• 30000 Joules
• 15000 Joules
• 25000 Joules
• 10000 Joules

Answer explanation

You do not need to use the speed, you should read your notes on how to explain it because I don't know how to :)

A car with a mass of 1000 kg accelerates from rest to a speed of 25 m/s over a distance of 50 meters. Calculate the total work done by the engine during this acceleration

• 490000 J

• 375000 J
• 250000 J
• 500000 J

Answer explanation

Ben said it was 490000 mb if you guys got that wrong.

What is the kinetic energy of a 24-kg object that is moving with the velocity of 2m/s

• 12 J
• 96 J
• 36 J
• 48 J

Answer explanation

Remember that the formula for Kinetic Energy is KE= 1/2(m)(v)^2 so you square the 2 to make 4 and then multiply that by the 24kg to get 96 and then you divide by 2 to get 48 J

Tags

CCSS.8.EE.A.2

A 10 kg object is lifted to the top of a hill that is 20 meters high. Calculate the gravitational potential energy of the object at the top of the hill. Gravity is 9.8

• 980 J
• 1960 J
• 3920 J
• 490 J

Tags

CCSS.7.RP.A.3

A 5 kg rock is dropped from a height of 30 meters above the ground. Calculate the gravitational potential energy of the rock just before it hits the ground. Assume the acceleration due to gravity is 9.8 m/s29.8m/s2

• 735 J
• 1470 J

• 245 J

• 980 J

Tags

CCSS.7.RP.A.3