Derek pushes a 10kg crate along a rough surface with 35N of force. He observes that it is only accelerating at a rate of 2ms2. What must the value of the force of friction be? (Assume the only two forces acting on the object are friction and Derek).

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

Abike rider starts from rest and accelerates 28.0 meters down a slope in 5.00 seconds. what is her acceleration? select one: a. 3.21 m/sec2 b. 1.75 m/sec2 c. 9.80 m/sec2 d. 2.24 m/sec2

Two forces produce equal torques on a door about the door hinge. the first force is applied at the midpoint of the door; the second force is applied at the doorknob. both forces are applied perpendicular to the door. which force has a greater magnitude?