Power and Machines - JSS2 Basic technology Past Questions and Answers - page 1
What is power?
The ability to do work
The rate at which work is done
The total energy in a system
The force applied over a distance
What is the SI unit of power?
Joule
Newton
Watt
Horsepower
One Watt is equivalent to:
One Joule per second
One Newton per metre
One Joule per metre
One Newton per second
Which of the following is NOT a type of simple machine?
Lever
Pulley
Motor
Inclined plane
A lever amplifies force by:
Increasing the distance over which the force is applied
Decreasing the amount of force required
Changing the direction of the applied force
All of the above
An inclined plane helps to:
Increase the speed of an object
Reduce the amount of force needito lift an object
Changing the direction of the force
Convert energy from one form to another
wheel and axle is used to:
Multiply force
Divide force
Change the direction of force
Increase speed without effort
Which simple machine consists of a wheel with a groove for a rope or cable?
Inclined plane
Screw
Pulley
Wedges
A screw is essentially a(n):
Inclined plane wrapped around a cylinder
Lever with a fulcrum
Wheel and axle with a groove
Wedge combined with a pulley
Which of the following is a complex machine?
Lever
Bicycle
Pulley
Inclined plane