Question

which of the following is an example of a normal force? throwing a football to a friend pulling a child in a wagon pushing a box across the room a laptop computer sitting on an office desk the force of gravity is ____ for objects of greater mass and ____ for objects of smaller mass. 10 weaker ; larger larger ; weaker similar ; different different ; similar true or false: forces are able to cause an object to start moving, stop moving, change directions, speed up, or slow down. * 5 point true false

Explanation:

• First question: A normal force is a contact force perpendicular to the surfaces in contact. When a laptop sits on a desk, the desk exerts a normal force upward on the laptop to support its weight. Throwing a football involves applied force, pulling a wagon is tension force, and pushing a box is an applied force.
• Second question: The force of gravity (\(F = mg\), where \(m\) is mass and \(g\) is acceleration due to gravity) is directly proportional to mass. So, for greater mass (\(m\)), \(F\) (force of gravity) is larger and for smaller mass, \(F\) is weaker.
• Third question: According to Newton's laws, forces can cause changes in an object's motion - start moving (if initially at rest), stop moving (decelerate to rest), change directions (alter velocity vector), speed up (accelerate), or slow down (decelerate).

Answer:

• First question: A laptop computer sitting on an office desk
• Second question: larger ; weaker
• Third question: True