To practice Problem-Solving Strategy 5.2 Dynamics problems.
A 30.0kg- box is being pulled across a carpeted floor by a horizontal force of 230N, against a friction force of 210N . What is the acceleration of the box? How far would the box move in 3s, if it starts from rest?
A 30.0kg- box is being pulled across a carpeted floor by a horizontal force of 230N, against a friction force of 210N . What is the acceleration of the box? How far would the box move in 3s, if it starts from rest?
Answer
SOLUTION Calculate acceleration of the boxa 1 Here m is the mass of the body, Fp is the applied force. Fr įs frictional force and r is the time elapsed. Given m- 30kg F 230N F-210N Substituting the values, 1 230-210 30 - 0.666m/s Hence acceleration is 0.666m/s Calculate distance covered S in3s Here u 0 is the initial velocity Substitute the values 2.997m Hence distance covered is 2.997m
