# Question

A person pushes a 14.0-kg lawn mower at constant speed with a force of F = 88.0 N directed along the handle, which is at an angle of 45.0o to the horizontal (Fig.4-45).

(a) Draw the free-body diagram showing all forces acting on the mower. Calculate.

(b) The horizontal friction force on the mower, then

(c) The normal force exerted vertically upward on the mower by the ground.

(d) What force must the person exert on the lawn mower to accelerate it from rest to 1.5m/s in 2.5 seconds, assuming the same friction force?

(a) Draw the free-body diagram showing all forces acting on the mower. Calculate.

(b) The horizontal friction force on the mower, then

(c) The normal force exerted vertically upward on the mower by the ground.

(d) What force must the person exert on the lawn mower to accelerate it from rest to 1.5m/s in 2.5 seconds, assuming the same friction force?

## Answer to relevant Questions

Two snow cats tow a housing unit to a new location at McMurdo Base, Antarctica, as shown in Fig. 4-46. The sum of the forces FA and FB exerted on the unit by the horizontal cables is parallel to the line L, and FA = 4500N. ...A pair of fuzzy dice is handing by a string from your rearview mirror, While you are accelerating from a stop-light to 28m/s in 6.0s, what angle θ does the string make with the vertical? See Fig. 4-50. What is the maximum acceleration a car can undergo if the coefficient of static friction between the tires and ground is 0.80?A box is given a push on that it slides across the floor. How far will it go, given that the coefficient of kinetic friction is 0.20 and the push imparts an initial speed of 4.0m/s?A small box is held in place against a rough wall by someone pushing on it with a force directed upward at 28o above the horizontal. The coefficients of static and kinetic friction between the box and wall are 0.40 and 0.30, ...Post your question

0