What is the weight of a 15-kg child on Earth?

Question

answers to choose from:

1. 1.53 Newtons

1. 24.8 Newtons

1. 147 pounds

1. 147 Newtons

Answer 1

Remember that there is a difference between mass and weight.

Mass is the amount of matter that exists. Mass remains constant no matter where it is.

Weight is a measurement of force. Weight changes based on how much the mass is being accelerated.

Also remember from Newton's second law that F = m*a, where F is the force in Newtons, m is the mass in kilograms, and a is the acceleration. So you can use that formula to find the weight (i.e. force) keeping in mind that the acceleration due to earth's gravity is 9.8 m/s^2