Science 6 Q3 Periodic Review

Which of the following refers to the force that pulls objects toward each other?

• friction

• gravity

• mass

• weight

Which of the above is used to express?

• weight

• kilogram, kg

• gravitational field strength

• newton per kilogram, N/kg

• mass

• newton, N

• distance

• meter, m

The force of attraction that exists between the moon and Earth is called ___.

• gravity

• friction

• mass

• weight

Which of the following will be directly affected if you travel from Earth to the moon.

• air resistance

• friction

• mass

• weight

Which of the following is not true about friction?

• Friction always produces undesirable effects.

• Friction acts in the opposite direction of motion.

• Friction increases when one object is on top of the other.

• Greater work is done in pushing objects because of friction.

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

• slippery floor

• worn out tires

• pushing heavy furniture

• firm grip on tennis rackets

The gravitational field strength on Earth is about 10 N/kg. What is the weight of an object that has a mass of 20 kg?

• 2 N

• 20 N

• 200 N

• 2000 N

Which of the following can happen if the distance between two objects is increase?

• The weights of the two objects will increase.

• The weights of the two objects will decrease.

• The force of attraction between two objects is increased.

• The force of attraction between two objects will decrease.

A swimmer uses a cap when swimming in order to ____.

• avoid formation of split ends

• reduce friction between hair and water

• increase friction between head and water

• protect the hair from the effects of chlorine

A parachute helps a parachutist land safely on the ground or water by ______.

• reducing air resistance that speeds up its motion

• reducing air resistance that slows down its motion

• increasing air resistance that slows down its motion

• increasing air resistance that speeds up its motion