Simple Machines

What is the basic principle behind the concept of 'work' in physics?

• Force times distance

• Force divided by distance

• Distance minus force

• Force plus distance

Which simple machine is described as a lever that goes in a circle?

• Wedge

• Wheel and Axle

• Inclined Plane

• Pulley

How does a movable pulley help in lifting heavy objects?

• It cuts the effort needed in half

• It increases the distance over which the force is applied

• It reduces the weight of the object

• It changes the direction of the force

What simple machine is formed by joining two inclined planes back to back?

• Screw

• Wedge

• Lever

• Pulley

Which simple machine is used in a car jack to lift a car?

• Wheel and Axle

• Lever

• Pulley

• Screw