Midterm Review: Energy & Momentum

Potential energy is found in

• a ball sitting motionless on the ground

• a balling rolling along the flat ground

• a ball sitting on top of a filing cabinet

Tags

NGSS.MS-PS3-2

If the speed of a moving object is tripled, what affect does it have on the object's kinetic energy?

• The kinetic energy is increased by a factor of nine.

• The kinetic energy is decreased by a factor of three.

• The kinetic energy is increased by a factor of six

• Tripling the speed does not affect the object's kinetic energy.

• The kinetic energy is increased by a factor of three.

A 3.00 kg toy falls from a height of 1.00 m. What will the kinetic energy of the toy be just before the toy hits the ground? (Assume no air resistance and that g = 9.81 m/s2.)

• 294 J

• 0.98 J

• 98.0 J

• 29.4 J

Tags

NGSS.HS-PS3-1

Kinetic energy is energy

• in a compressed spring

• of motion

• of position

• stored in a chemical compound

Tags

NGSS.HS-PS3-2

Harry climbs a mountain that is 80 meters high. How much potential energy does he gain if he weighs 900 Newtons?

• 7.20 x 10^4 J

• 7.06 x 10^5 J

• 1.13 x 10^1 J

• 7.35 x 10^3 J

Match Potential energy to the correct definition:

• The energy of an object due to its position

• The energy of an object due to its motion

• Equal to Work

• The rate of doing work

• The product of force times displacement in the direction of the displacement

Tags

NGSS.HS-PS2-4

Choose the best answer from the options that follow each question. What is the potential energy of a 1.0 kg mass 1.0 m above the ground?

• 9.8 J

• 1.0 J

• 96 J

• 10 J

Tags

NGSS.HS-PS3-1

A 500 kg elevator is pulled upward at a constant speed for 50.0 m. How much work was done on the elevator?

• 2.75x10^5 J

• 2.45x10^4 J

• 2.45x10^5 J

• 2.75x10^4 J

Tags

NGSS.HS-PS2-4

NGSS.HS-PS3-1

What is the kinetic energy of a 0.135 kg baseball thrown at 40.0 m/s?

• 87.0 J

• 216 J

• 54.0 J

• 108 J

Tags

NGSS.HS-PS3-1

NGSS.HS-PS3-2

If a power lifter raises a 2000 N weight a distance of 1.0 meters in 0.5 seconds, what is his power output?

• 1000 W

• 5000 W

• 4000 W

• 2000 W