PT2 REVISION PART 2

A book falls off the desk. What moves the book towards the floor?

• Frictional Force

• Magnetic Force

• Gravitational Force

A boy rides a skate board down a hill. Eventually the skate board stops. Which is most responsible for causing the skateboard to stop?

• gravity acting on the skateboard

• friction acting on the skateboard

• the mass of the skateboard

• the mass of the boy

Arul pushed a heavy table but failed to move it. Which of the following is true about the statement?

• Energy is spent and work is done

• Energy is not spent but work is done

• Energy is spent but work is not done

Which of the following statements about friction are false?

• Friction makes a moving object slow down

• Friction produces heat

• Friction moves an object

• Friction doesn't let us walk

What type of simple machine is found inside the cap of a pickle jar?

• lever

• inclined plane

• screw

• wheel and axle

Which of these is not an example of an inclined plane?

• ladder

• stairs

• wall

• driveway

Which is an example of someone using a simple machine to do work?

• a boy runs across a football field

• a banker counts money

• a mother pushes a stroller up a ramp into a building

• a girl eats a sandwich

Jan is using a screwdriver to insert a screw.  The screwdriver is being used as...

• a pulley

• a lever

• a screw

• a wheel and axle

Thomas is using a screwdriver to pry open a paint can.  The screwdriver is being used as...

• pulley

• inclined plane

• screw

• lever

Which is a characteristic of simple machines?

(There could be more than one correct answer)

• they have few or no moving parts

• they make our work easier, simpler and faster

• they run on electricity