A boy slides across a frozen lake. When he hits a rough patch, he slows down. Which force caused him to slow down?
A. Strong nuclear force
B. Friction
C. Gravity
D. Magnetic force

How would doubling the made of an object change the objects potential energy

In which situation has the independent variable for the experiment been changed? check all that apply. changed from counting the number of duckweed at day 0 and day 14 to counting them every day changed from testing duckweed growth in beakers to testing duckweed growth in large outdoor tanks changed from testing the effect of ph on duckweed growth to testing the effect of light levels on duckweed growth changed from testing the effect of acid ph on duckweed growth to testing the effect of basic ph on duckweed growth

An ionic compound can conduct electricity when a it is dissolved in water b its crystals are ground into powder c it is in solid form d it is heated to just below its melting point