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Which of the following is NOT a type of simple machine?

Inclined plane.

Lever.

Pulley.

Gear.

In which situation would an inclined plane be most beneficial?

Changing the direction of a force.

Lifting a heavy load directly.

Reducing the amount of force required to lift a heavy load.

Increasing the speed of a moving object.

Which of the following is a typical use of a pulley in a building site?

To amplify the force required to move a load.

To change the direction of force without changing its magnitude.

To lift heavy materials to a higher point.

To reduce friction in moving parts.

Why is no machine 100% efficient?

Because it is impossible to transfer all energy in a machine.

Because some energy is always lost as heat due to friction.

Because the machine always performs more work than the input.

Because machines always produce work at the same rate.

Which of the following is true for a class 3 lever?

The load is between the effort and the fulcrum.

The fulcrum is between the effort and the load.

The effort arm is shorter than the load arm.

The effort is between the load and the fulcrum.