Force diagrams and equilibrium

In the diagrams below, R stands for Reaction, W stands for Weight, T stands for Tension, P is an additional force and F stands for Friction.

Which of the force diagrams could represent a ball in free fall, if there is no air resistance?

• A

• B

• C

• D

• E

In the diagrams below, R stands for Reaction, W stands for Weight, T stands for Tension, P is an additional force and F stands for Friction.

Which two force diagrams could represent a suitcase standing at rest on a smooth floor?

• A

• C

• D

• E

• F

In the diagrams below, R stands for Reaction, W stands for Weight, T stands for Tension, P is an additional force and F stands for Friction.

Which force diagram could represent a suitcase being pushed across a rough floor?

• A

• C

• D

• E

• F

In the diagrams below, R stands for Reaction, W stands for Weight, T stands for Tension, P is an additional force and F stands for Friction.

Which force diagram could represent a glider flying at constant velocity, assuming negligible air resistance?

• A

• B

• D

• E

• F

In the diagrams below, R stands for Reaction, W stands for Weight, T stands for Tension, P is an additional force and F stands for Friction.

Which force diagram could represent a rocket, just after the engines have ignited, but before it begins to leave the ground?

• A

• C

• D

• E

• F

In the diagrams below, R stands for Reaction, W stands for Weight, T stands for Tension, P is an additional force and F stands for Friction.

Which force diagram could represent a spider hanging by a thread?

• A

• C

• D

• E

• F

In the diagrams below, R stands for Reaction, W stands for Weight, T stands for Tension, P is an additional force and F stands for Friction.

Which force diagram could represent a puck sliding across perfectly smooth ice, assuming no air resistance?

• A

• C

• D

• E

• F

In the diagram below, the pulleys are assumed frictionless. The acceleration due to gravity is g.

If the system is in equilibrium, what is the size of the tension T₂? [I'll assume your answer is in Newtons, don't add this unit to your answer]

In the diagram below, the pulleys are assumed frictionless. The acceleration due to gravity is g.

If the system is in equilibrium, there must also be a friction force acting between the 10 kg block and the table. What is the magnitude of this friction force?

[I'll assume your answer is in Newtons, don't add this unit to your answer]

In the diagram below, the pulleys are assumed frictionless. The acceleration due to gravity is g.

If the maximum frictional force is F and it is not sufficient for the system to remain in equilibrium, what is the resultant force on the 10 kg mass?

• T₂ + T₁

• T₂ -T₁ + F

• T₁ - T₂

• T₂ - T₁ - F