Engineering Mechanical Principles Question Bank – Level 3

A car is moving at a constant speed of 20 m/s on a straight road. What is the net force acting on the car?

• 0 N

• 20 N

• 200 N

• Cannot be determined

A 10 kg box is placed on a frictionless surface. If a force of 50 N is applied, what is the acceleration of the box?

• 5 m/s²

• 10 m/s²

• 15 m/s²

• 20 m/s²

A person feels pushed back in their seat when a car suddenly accelerates because of:

• inertia

• gravity

• friction

• momentum

Draw a free body diagram for a beam supported at both ends with a weight hanging from the centre. Label all forces.

• A beam with supports at both ends and a central weight, showing upward forces at the supports and downward force at the center.

• A beam with no supports and a weight at one end, showing only downward forces.

• A beam with supports at both ends and no weight, showing no forces.

• A beam with a central support and weights at both ends, showing upward force at the center and downward forces at the ends.

A ladder leans against a frictionless wall. Identify and explain the forces acting on the ladder.

• Gravity and normal force from the ground

• Friction from the wall

• Tension in the ladder

• Air resistance

A block is resting on a rough surface. Which of the following forces are acting on the block?

• Gravitational force and normal force only

• Gravitational force, normal force, and frictional force

• Gravitational force and frictional force only

• Normal force and frictional force only

A 5 kg object is on Earth and then taken to the Moon, where gravity is 1.6 m/s². What is its weight in both locations?

• Earth: 49 N, Moon: 8 N

• Earth: 50 N, Moon: 8 N

• Earth: 49 N, Moon: 8.5 N

• Earth: 50 N, Moon: 8.5 N

If an astronaut in space has a mass of 70 kg, what is their weight?

• 0 N

• 70 N

• 700 N

• Cannot be determined

What is the mass of an object that weighs 245 N on Earth?

• 25 kg

• 50 kg

• 75 kg

• 100 kg

A beam is held in place by two supports. If the sum of vertical forces acting on it is zero, does this mean it is in equilibrium?

• Yes, because the sum of vertical forces being zero indicates equilibrium.

• No, because equilibrium requires both vertical and horizontal forces to be zero.

• Yes, because only vertical forces matter for equilibrium.

• No, because equilibrium is not related to forces.