G5_SCI6_W5

Which of the following statements is INCORRECT about simple machines?

• Simple machines can change the direction of applied forces?

• Simple machines can ease work when used properly.

• Simple machines are complex.

• Simple machines can multiply the applied forces.

Sharp objects like knives and axes are examples of what type of simple machine?

• lever

• pulley

• inclined plane

• wedge

Which of the following would you use a pulley for?

• cut food

• hold pieces of wood together

• pull curtains

• All of the above.

Which of the following describes a wedge?

• It can pull objects up and down.

• A straight bar or rod that rotates about an axis.

• A ramp with one end higher than the other end.

• It can cut, tear, or break something into two or more parts.

A wheelbarrow is an example of what class of lever?

• first class

• second class

• third class

Which of the following situations shows a positive effect of friction?

• slippery floor

• worn out tires

• pushing heavy furniture

• firm grip on tennis rackets

Which of the following shows a way of reducing friction?

• making surfaces rougher

• increasing the mass of an object

• using rubber materials

• applying lubricants between gears

When two objects slide against each other, _____, a force that opposes motion, is produced.

• gravity

• applied force

• friction

• All of the above.

When two objects are farther from each other, the gravitational force between them _____.

• is greater

• is not affected

• is lesser

• is faster

Which of the following has the highest gravitational force?

• a ball weighing 0.2 kg

• a 3 kg metal bar

• a 1.5 liters of soda that weights 1 kg

• a 500 g globe