A 4 kg object is pushed with a force of 20 N. If the frictional force is 4 N, wh
Practice Questions
Q1
A 4 kg object is pushed with a force of 20 N. If the frictional force is 4 N, what is the acceleration of the object?
4 m/s²
5 m/s²
6 m/s²
7 m/s²
Questions & Step-by-Step Solutions
A 4 kg object is pushed with a force of 20 N. If the frictional force is 4 N, what is the acceleration of the object?
Correct Answer: 4 m/s²
Step 1: Identify the mass of the object. The mass is 4 kg.
Step 2: Identify the applied force. The applied force is 20 N.
Step 3: Identify the frictional force. The frictional force is 4 N.
Step 4: Calculate the net force acting on the object. Use the formula: Net force = applied force - frictional force.
Step 5: Substitute the values: Net force = 20 N - 4 N = 16 N.
Step 6: Use the net force to find the acceleration. Use the formula: Acceleration (a) = Net force / mass.
Step 7: Substitute the values: a = 16 N / 4 kg.
Step 8: Calculate the acceleration: a = 4 m/s².
Newton's Second Law of Motion – This law states that the acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass.
Frictional Force – Understanding how friction opposes motion and affects the net force acting on an object.
Net Force Calculation – The process of determining the net force by subtracting friction from the applied force.
