P5.3 Drawing forces and resultant forces

What is the definition of "resultant force"?

• The sum of all forces acting on an object.

• The single force that can replace two or more forces and have the same effect.

• The force that opposes motion.

When an object is in equilibrium, what can be said about the resultant force acting on it?

• It is greater than zero.

• It is less than zero.

• It is zero.

What does the diagonal of a parallelogram of forces represent?

• The individual forces.

• The resultant force.

• The angle between the forces.

How are forces represented in a scale diagram?

• By numbers only.

• By arrows where length indicates magnitude and the arrowhead indicates direction.

• By circles of varying sizes.

According to Newton's First Law of motion, if an object has no resultant force acting on it and is moving, what will it do?

• It will slow down and stop.

• It will accelerate.

• It will move with constant speed in the same direction.

When investigating the parallelogram of forces using pulleys and weights, what practical step ensures accuracy?

• Using as many weights as possible.

• Clamping the stand to the bench.

• Placing the setup on a rough surface.

What kind of diagram shows the magnitude and direction of all forces acting on an object?

• A bar chart.

• A free-body diagram.

• A pie chart.

What is the purpose of drawing a parallelogram of forces when dealing with two forces?

• To determine their combined mass.

• To find their resultant when they are not acting along the same line.

• To measure the time they act.

If a car is stuck in mud and pulls a trailer, what must be true about the resultant force for the car to move?

• It must be zero.

• It must be in the opposite direction of motion.

• It must be greater than zero.

What tool is essential for accurately measuring angles when drawing a parallelogram of forces?

• A ruler.

• A protractor.

• A newtonmeter.