Newton's 1st & 2nd Law PFA

The image shows forces acting on a box.

What is the net force acting on the box?

• 2.4 N toward the left.

• 6.0 N toward the left.

• 2.4 N toward the right.

• 6.0 N toward the right

There are two forces acting on an object. F₁ pushes the object upward and has a magnitude of 7.7 N. F₂ pulls the object upward and has a magnitude of 1.1 N.

What is the net force acting on the object?

• 6.6 N downward.

• 8.8 N upward.

• 8.8 N downward.

• 6.6 N upward.

A plane has four engines, each producing equal push. The air friction acting on the airplane opposes the push of the engines and is 98,000 N to the north.

If the net force acting on the plane is zero, which option describes the push produced by just one of the engines?

Responses

• 24,500 N south.

• 98,000 N south.

• 24,500 N north.

The image shows forces acting on a box. The net force acting on the box is 2.1 N toward the left.

What is the magnitude of F₃?

Responses

• 0.6 N.

• 6.8 N.

• 3.6 N.

• 2.6 N.

Study the image.

The image shows a toy car carrying a block. The car is moving toward the left with constant velocity.

Assuming there is little resistance between the car and the block, what will happen if the car is suddenly stopped?

• The block will stop with the car.

• The block will move toward the left.

• The block will move toward the right.

In a tug-of-war game, both teams pick up the rope from the ground and start pulling. The left and right teams are applying the same amount of force on the rope.

What will happen?

• The rope will move toward the left.

• The rope will move toward the right.

• The rope will not move.

An actual car on a real road is moving north with a constant velocity of 45 km/h.

Which statement about this car is true?

• There is no net force acting on the car.

• The direction of the net force acting on the car is toward the south.

• The direction of the net force acting on the car is toward the north.

Study the image.

The image shows two forces acting on a box.

If the box was initially not moving, what will be its motion under the shown forces?

• It will move toward the left.

• It will not move.

• It will move toward the right.

The engine of a plane creates a push of 90,000 N toward the west. The air resistance acting on the plane opposes this push with a magnitude of 84,000 N.

If the plane has a mass of 2,300 kg, what is the magnitude of its acceleration?

• 0.38 m/s².

• 77 m/s².

• 37 m/s².

• 2.6 m/s².

An object has two forces acting on it. The first force acts upward and has a magnitude of 5.6 N. The second force also acts upward and has a magnitude of 1.2 N.

If the object has a mass of 2.7 kg, what is the acceleration of the object?

• 2.5 m/s² downward.

• 1.6 m/s² downward.

• 2.5 m/s² upward.

• 1.6 m/s² upward.