Newton's Laws of Motion v2

A 10-N force and a 30-N force act on an object in opposite directions. What is the netforce?

The law of inertia applies to 

Which of the following would exert the most pressure on theground? 

A high school student hits anail with a hammer. During the collision, there is a force 

Inertia is the reluctance any material object has to change in its state of motion. 

After a cannon ball is fired into frictionless space the # of force needed to keep it going = 

On Jupiter gravity is about 3X that onEarth. How much would a 100 kg rock weigh on Jupiter?

. The earth and moon pull on each other with equal amounts of force.

.The combination of all the forces that act on an object is called the net force.

When one object exerts force on 2nd object, 2nd object exerts = force back on 1st object. 

Pressure is defined as 

Which has more mass, a kilogram of feathers or a kilogram of iron? 

If a hockey puck slides on a frictionless surface, it will  slow down because of its inertia. 

Falling from a high-flying stationary helicopter, BJ’s velocity increases & his acceleration 

The acceleration produced by a net force on an object is 

34.  A 50-kg block of cement is pulled upward with a force of 600 N. What is its acceleration?

A girl weighing 200 N hangs from 2 rings, each with ______ Newtons of tension.

Awoman weighing 500 N sits on the floor. She exerts a force on the floor of 

Galileo found that a ball rolling down 1 inclined plane rolls how far up a 2nd inclined plane? 

A tennisball and steel ball same size r dropped same time. Which has greater force acting? 

.Pressure is defined as the force one object exerts on another object. 

 A rocketship is pushed forward by gases that are forced out the back of the ship.

.The acceleration of an object is inversely proportional to the net force acting on it. 

 As a 500 N woman sits on the floor, the floorexerts a force on her of 

The law of inertia states that an object 

You push with 30 N on a 3-kg block with no opposing forces.What is the block’s acceleration?

34.  A 60-kg boy on skates pushes a wall w/ 30 N of force & recoils.What is his acceleration?

 If the force acting on a cart doubles, what happens to the cart’s acceleration? 

Speed of object dropped in air will increase without limit until itstrikes theground.

 A tennis ball & steel ball samesize r dropped same time. In vacuum, which has > acceleration? 

Forces always occur 

Air resistance is caused by friction between the air and an object moving throughtheair. 

1.The amount of matter in an object is called its weight. 

Some forces act on an object: 20 Nnorth, 50 N south, and 40 N west. What is the net force?

Objectsmove only when a force is exerted.