Forces Test

A person kicks a 4.0kg door with a 48N force causing the door to accelerate at 12 m/s² . What is the magnitude of the force exerted by the door on the person?

• 48 N

• 24 N

• 12 N

• 4 N

Tags

NGSS.HS-PS2-1

Equilibrium exists in a system where three forces are acting concurrently on an object. If the system includes a 5.0N force due north and a 2.0N force due south, the third force must be

• 7.0N South

• 7.0N North

• 3.0N South

• 3.0N North

Tags

NGSS.HS-PS2-1

When a 12N horizontal force is applied to a box on a horizontal tabletop, the box remains at rest. Any more force and the box begins to move. The force of static friction acting on the box is

• 0N

• Between 0N and 12N

• 12N

• Greater than 12N

Tags

NGSS.HS-PS2-1

Net force F causes mass (m1 ) to accelerate at rate a.

A net force 3F causes mass (m2) to accelerate at rate 2a.

What is the ratio of mass (m1) to mass (m2)?

• 1:3

• 2:3

• 1:2

• 1:6

Tags

NGSS.HS-PS2-1

Compared to the force needed to start sliding a crate across a rough level floor, the force needed to keep it sliding once it is moving is

Choose the best option:

• less

• greater

• the same

Four forces act concurrently on a block on a horizontal surface as shown in the diagram below. As a result of these forces, the block

• moves at a constant speed to the right

• moves at a constant speed to the left

• accelerates to the right

• accelerates to the left

Tags

NGSS.HS-PS2-1

If a 30N force is required to accelerate a 2kg object at 10 m/s² over a level floor, then the magnitude of the frictional force acting on the object is

• 0N

• 10N

• 20N

• 30N

Tags

NGSS.HS-PS2-1

Two forces act concurrently on an object on a horizontal, frictionless surface, as shown in the diagram below. What additional force, when applied to the object, will establish equilibrium?
 
 $\overleftarrow{6N}\ \ \ \ \left[Object\right]\ \ \ \overrightarrow{\ 10N}$  

• 16 N toward the right

• 16 N toward the left

• 4 N toward the right

• 4 N toward the left

Tags

NGSS.HS-PS2-1

Compared to the gravitational force between two nucleons in an atom of helium, the nuclear force between the nucleons is

• weaker and has a short range

• weaker and has a longer range

• stronger and has a short range

• stronger and has a longer range

The diagram shows a student applying a 10N force to slide a piece of wood at constant speed across a horizontal surface. After the wood is cut in half, one piece is placed on top of the other, as shown. What is the magnitude of the force, F, required to slide the stacked wood at constant speed across the surface?

• 40 N

• 20 N

• 10 N

• 5 N

Tags

NGSS.HS-PS2-1