Newton's Laws

Examples of solutions

Problem 1

A warehouse worker pushes a crate along the floor by a force of 10 N that points downward at an angle of 45° below the horizontal. Find the horizontal and vertical components of the force.

Problem 2

A man is dragging a trunk up the loading ramp of a mover's truck. The ramp has a slope angle of 20.0°, and the man pulls upward with a force F whose direction makes an angle of 30.0° with the ramp. a) How large a force F is necessary for the component F_x parallel to the ramp to be 80.0 N? b) How large will the component F_y then be?

Problem 3

Two dogs pull horizontally on ropes attached to a post; the angle between the ropes is 50.0°. If dog A exerts a force of 310 N and dog B exerts a force of 250 N, ?nd the magnitude of the resultant force and the angle it makes with dog A's rope.

Problem 4

A box rests on a frozen pond, which serves as a frictionless horizontal surface. If a fisherman applies a horizontal force with magnitude 48.0 N to the box and produces an acceleration of magnitude 6.00 m/s²,what is the mass of the box?

Problem 5

What magnitude of net force is required to give a 125-kg refrigerator an acceleration of magnitude 1.20 m/s²?

Problems for solution without assistance

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