TLevel U7 Mechanical Principles

A simply supported beam supports a single load at a single point along its length. What is the formula to calculate the support reaction at R1?

• R1 = (F x L1) / (L1 + L2)

• R1 = (F x L1) / (L2)

• R1 = (F x L2) / (L1)

• R1 = (F x L2) / (L1 + L2)

The energy possessed by a flywheel because of its rotary motion is an example of:

• Braking force

• Rotational kinetic energy

• Gravity

• Tractive effort

A vehicle has a mass of 800kg and is travelling at 1m/s. It collides with a second vehicle, which is stationary. The two become fixed together as a single mass travelling in the same direction as the original vehicle was at 0.4 m/s. Assuming that no energy was lost in the collision, calculate the mass of the second vehicle.

• 320kg

• 480kg

• 1120kg

• 1200kg

In which of the following force systems do all forces pass through a single point?

• Concurrent

• Kinetic

• Non-concurrent

• Coplanar

Calculate the potential energy of a pallet with a mass of 70kg that is sitting on top of a platform 20m high (hint: Gravity = 9.8m/s²).

• 142.8J

• 882J

• 1400J

• 13 720J

What is acceleration?

• Change in the velocity of an object over time, measured in m/s²

• Change in the velocity of an object over time, measured in m/s

• The motion of an object that is moving very fast

• Change in the position of an object over time, measured in m/s

Newton’s first law states … ?

• Energy cannot be created or destroyed, just changed between different forms

• An object will remain at rest or in uniform motion in a straight line unless compelled to change its state by the action of an external force

• An object is in equilibrium if the forces acting on it are zero

• The acceleration of an object produced by a force is proportional to the mass of the object in the direction opposite to the force

You measure a distance of 7m between two markers, and releasing a constant velocity object at one marker, you find it takes 4.2 seconds to travel between the markers. What is the speed of the object?

• 29m/s

• 1.67m/s

• 0.6m/s

• 7m/s

Which of the following statements is true for a simply supported beam with uniformly distributed loading?

• The maximum value of the shear force is at the midpoint of the beam

• The bending moment diagram will be a sloping straight line passing through the midpoint

• The maximum value of the bending moment will be experienced at the two ends of the beam

• The reaction forces at each end of the beam will be the same

A forklift truck with a mass of 800kg is travelling with a velocity of 40m/s. Calculate its kinetic energy.

• 32kJ

• 313.6kJ

• 640kJ

• 1.28MJ