Physics: Work and Energy

Question 1

What is the equation for work?

Answer 1

W=Fd

Question 2

True or False: Work can only be done in a horizontal or vertical direction.

Answer 2

True

Question 3

What is the equation for work done in a non-horizontal direction?

Answer 3

Net Work = Net Force x Displacement x cos of the angle between them

Question 4

What is the unit for work?

Answer 4

Joules (J)

Question 5

A tugboat pulls a ship with a constant force of 5.00x10^3 N and causes the ship to move through a harbor. how much work is done on the ship if it moves a distance of 3.00 km?

Answer 5

15000000 J

Question 6

A weight lifter lifts a set of weights a vertical distance of 2.00m. If a constant net force of 350 N is exerted on the weights, what is the net work done on the weights?

Answer 6

700 J

Question 7

Is work a vector or scalar quantity?

Answer 7

Scalar, it can be positive or negative though.

Question 8

Why is the equation 1/2mv^2 important

Answer 8

It is the equation for kinetic energy

Question 9

Is kinetic energy a vector or scalar quantity?

Answer 9

Scalar

Question 10

What is the unit for energy?

Answer 10

Joules (J)

Question 11

What is the work kinetic energy theorem?

Answer 11

Wnet = ΔKE

Question 12

What is the equation for gravitational potential energy?

Answer 12

GPE = mass x gravity x height

Question 13

What is the equation for elastic potential energy?

Answer 13

1/2 x spring constant x distance compressed or stretched^2