WorksheetsEngineering Mechanical Principles Question Bank – Level 3
Total questions: 45
Worksheet time: 23mins
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.
A 500 N force is applied to an object, but it does not move. What can you conclude about the forces acting on it?
The forces are balanced.
The forces are unbalanced.
There is no friction.
The object is accelerating.
A traffic light hangs from two cables at equal angles. How do the tensions in the cables compare to the weight of the light?
The tensions are equal to the weight of the light.
The tensions are each half the weight of the light.
The tensions are each greater than the weight of the light.
The tensions are each less than the weight of the light.
A 2 m long spanner is used to apply a 100 N force perpendicular to its length. Calculate the torque about the pivot.
100 Nm
150 Nm
200 Nm
250 Nm
A uniform beam is 4 m long and supported at one end. A 200 N force is applied 3 m from the support. Find the moment about the support.
400 Nm
600 Nm
800 Nm
1000 Nm
If a force is applied at an angle to a lever, which component of the force contributes to the moment?
The entire force
The perpendicular component of the force
The parallel component of the force
None of the components
A lorry carrying a high load is more likely to tip over when turning because:
it has a lower center of gravity.
it has a higher center of gravity.
it is moving at a slower speed.
it is more stable.
A metal sheet is cut into a L-shape. Will its centre of mass be at its geometric centre?
Yes, it will be at the geometric centre.
No, it will not be at the geometric centre.
A 2 m steel wire stretches 0.01 m when a force is applied. What is the strain in the wire?
0.005
0.01
0.02
0.1
A metal rod has a cross-sectional area of 0.005 m² and experiences a force of 1000 N. Calculate the stress in the rod.
200,000 N/m²
150,000 N/m²
250,000 N/m²
300,000 N/m²
Strain has no units because:
it is a ratio of two similar quantities, thus the units cancel out.
it is a measure of force, which is unitless.
it is a measure of displacement, which is unitless.
it is a measure of time, which is unitless.
A spring has a stiffness of 200 N/m. If a force of 50 N is applied, how much does the spring extend?
0.25 m
0.5 m
0.1 m
0.2 m
What happens to a material when it is stretched beyond its limit of proportionality?
It returns to its original shape
It breaks immediately
It becomes permanently deformed
It changes color
A rubber band does not obey Hooke’s Law because:
it has a non-linear elastic behavior.
it is made of rubber.
it is too flexible.
it is too small.
A force of 100 N moves a box 5 m across the floor. How much work is done?
100 J
500 J
50 J
200 J
If a motor does 2000 J of work in 10 seconds, what is its power output?
100 W
200 W
300 W
400 W
Can an object be moving if no work is being done on it?
Yes, an object can be moving if no work is being done on it.
No, an object cannot be moving if no work is being done on it.
A 10 kg object is dropped from a height of 5 m. What is its gravitational potential energy before it falls?
50 J
100 J
200 J
500 J
A car’s speed doubles. By what factor does its kinetic energy increase?
2 times
3 times
4 times
8 times
If an object’s mass is tripled, how does this affect its kinetic energy at a constant velocity?
The kinetic energy is unchanged.
The kinetic energy is doubled.
The kinetic energy is tripled.
The kinetic energy is quadrupled.
A rollercoaster starts at a height of 50 m and moves down a track. Assuming no friction, what will its speed be at 20 m height?
10 m/s
20 m/s
30 m/s
40 m/s
In a real system, why is mechanical energy not fully conserved?
Because of friction and air resistance
Due to perfect energy transfer
Because energy is created
Due to lack of motion
A pendulum swings back and forth. How is energy transferred during its motion?
Energy is transferred from potential to kinetic energy and vice versa.
Energy is transferred from kinetic to thermal energy.
Energy is transferred from potential to thermal energy.
Energy is transferred from kinetic to sound energy.
The difference between static and kinetic friction is:
Static friction occurs when objects are at rest, while kinetic friction occurs when objects are in motion.
Static friction is always greater than kinetic friction.
Kinetic friction depends on the speed of the moving object, while static friction does not.
Static friction is a type of kinetic friction.
A box is pushed with 20 N, but does not move. What can be said about the frictional force acting on it?
The frictional force is less than 20 N.
The frictional force is equal to 20 N.
The frictional force is more than 20 N.
The frictional force is zero.
If friction is reduced to zero, will a moving object stop on its own?
Yes, it will stop on its own.
No, it will not stop on its own.
A lever has a mechanical advantage of 4. What does this mean?
It means the lever can lift 4 times the input force.
It means the lever can lift 4 times the output force.
It means the lever can lift 4 times its own weight.
It means the lever can lift 4 times the weight of the lever arm.
A machine has an efficiency of 80%. What happens to the missing 20% of energy?
It is converted into useful work.
It is lost as heat and sound.
It is stored in the machine.
It is recycled back into the system.
A pulley system requires 500 J of input energy to lift a load, but only 400 J of useful work is done. Calculate its efficiency.
80%
75%
85%
70%
A wheel rotates at 10 rad/s. If its radius is 0.5 m, what is the linear velocity of a point on its edge?
5 m/s
10 m/s
15 m/s
20 m/s
How is torque different from force?
Torque is a measure of rotational force, while force is a measure of linear force.
Torque and force are the same, both measure linear force.
Torque is a measure of linear force, while force is a measure of rotational force.
Torque and force are unrelated concepts.
Increasing the length of a spanner makes it easier to loosen a bolt because:
it increases the force applied.
it increases the torque applied.
it decreases the friction.
it decreases the weight of the spanner.
Pressure increases with depth in a liquid because:
the weight of the liquid above increases.
the temperature of the liquid increases.
the density of the liquid decreases.
the volume of the liquid decreases.
A submarine is at a depth where the pressure is 300 kPa. What happens to this pressure if the submarine goes deeper?
The pressure increases.
The pressure decreases.
The pressure remains the same.
The pressure fluctuates.
What is the relationship between fluid velocity and pressure in Bernoulli's principle?
Fluid velocity and pressure are directly proportional.
Fluid velocity and pressure are inversely proportional.
Fluid velocity and pressure are not related.
Fluid velocity and pressure are equal.
Why does an astronaut in orbit of earth experience weightlessness?
There is no gravity acting on the astronaut in space.
The astronaut is in free fall.
The astronaut’s mass becomes zero in orbit.
The astronaut is too far from Earth for gravity to affect them.
