13. Students are investigating how mass affects the force needed to move an object. They attached a wooden block to a spring scale and placed a 10 g mass
on top of the block and pulled it 50 cm across the table. Which of the following
changes to their setup would result in a larger force reading on the spring scale?
Bock with 10g mass
Force shown on
spring scale
50cm

1.Sliding the block 60 cm

2.Using a bigger spring scale,

3.Using a 20 g mass

4.Using a circular piece of wood,

How many seconds does it take a pebble released from rest off a bridge to fall 29.4 m ? what is the pebble's speed when it has fallen 29.4 m ?

When temperature of a substance increases, of its particles increase resulting in more between particles. real world applications of thermal expansion absolute zero (-273 degrees c) is the lowest possible temperature on the kelvin scale. it is a measure of where a substance has no kinetic energy. heat is a process of the . energy flows spontaneously from a object to a until equilibrium is reached. heat is measured in heat is transferred throughis a method of heat transfer that occurs between particles of matter that are in direct contact with each other. are poor conductors that impede / reduce the rate of heat transfer. is a method of heat transfer that occurs in fluids (non-solids) by means of currents. real world application of convectiona method of heat transfer through electromagnetic waves. when energy moves from one object to another inside a closed system, no energy is or in the system in the transaction. systems will spontaneously move to a state of organized energy or high disorder over time called

Observations show that interstellar clouds can have almost any shape and