Acceleration occurs when an object is subjected to a(n): a- force
b- balanced force
c- unbalanced force
d- contact force
​

Polly is pushing a box across the floor with a force of 30 n. the force of gravity is –8 n, and the normal force is 8 n. which value could describe the force of friction if polly could not move the box?

Relative to the ground below, how many joules of potential energy does a 1000-kg boulder have at the top of a 5-m ledge?

Which of hubble’s discovery support the big bang theory