1. How does a fixed pulley act as a machine? O A It changes the direction and the size of the input force
O B It changes the size of the input force only
O C It changes neither the size nor the direction of the input force
OD It changes the direction of the input force only

How are calculation for velocity and speed different

Which explanation describes the forces involved for a person to walk down the sidewalk? a. the person's feet push backward on the sidewalk; the sidewalk pushes backward on the person. b. the person's feet push forward on the sidewalk; the sidewalk does not push on the person. c. the person's feet push backward on the sidewalk; the sidewalk pushes forward on the person. d. the person's feet push forward on the sidewalk; the sidewalk pushes forward on the person.

Asmall 21 kilogram canoe is floating downriver at a speed of 1 m/s. what is the canoe's kinetic energy?