Forces, Pressure, and Moments

What is the SI unit of force?

• Watt

• Newton (N)

• Joule

• Volt

Define pressure and provide its formula.

• P = F/A

• P = F

• P = V/A

• P = F/V

Explain the difference between mass and weight.

• Mass is the amount of matter in an object, weight is the force exerted on an object due to gravity.

• Mass is measured in pounds, weight is measured in kilograms.

• Mass is the weight of an object, weight is the size of an object.

• Mass is the force of gravity on an object, weight is the amount of matter in an object.

How does an increase in surface area affect pressure?

• Pressure becomes negative

• Pressure decreases

• Pressure remains constant

• Pressure increases

What is the principle of moments?

• The principle of moments only applies to objects with uniform density.

• The principle of moments is only valid for objects with a mass less than 1 kg.

• The principle of moments states that for an object in equilibrium, the sum of the clockwise moments about any point is equal to the sum of the anticlockwise moments about the same point.

• The principle of moments states that the sum of clockwise moments is greater than anticlockwise moments.

Calculate the pressure exerted by a force of 200N on an area of 2m^2.

• 400 Pa

• 150 Pa

• 250 Pa

• 100 Pa

Give an example of a contact force and a non-contact force.

• Tension (contact force) and Electrostatic force (non-contact force)

• Friction (contact force) and Gravity (non-contact force)

• Normal force (contact force) and Buoyant force (non-contact force)

• Magnetism (contact force) and Air resistance (non-contact force)

How does the direction of a force affect an object's motion?

• The direction of a force affects an object's motion by determining the direction in which the object accelerates.

• The direction of a force changes the object's mass

• The direction of a force has no impact on an object's motion

• The direction of a force causes the object to slow down

What is the relationship between force, mass, and acceleration?

• F = m * a

• F = a / m

• F = m / a

• m = F * a

Explain how a lever works in terms of moments.

• A lever works by applying a force at a certain distance from a pivot point. The moment (torque) produced by the force is calculated as the force multiplied by the distance from the pivot point. This moment allows the lever to lift or move objects with less force applied.

• A lever works by pushing directly on the object to move it.

• Levers are only effective for moving heavy objects.

• The moment produced by a lever is calculated by dividing the force by the distance from the pivot point.