Forces

How does gravity act on an object?

• Gravity pushes the object away from the Earth.
• Gravity has no effect on objects.
• Gravity pulls the object towards the Moon.
• Gravity pulls the object towards the center of the Earth.

How are weight, mass and the forces of gravity related?

• Weight is the force of gravity acting on an object's volume.
• Weight is the force of gravity acting on an object's mass.
• Mass is the force of gravity acting on an object's weight.
• Gravity is the mass of an object acting on its weight.

What are the units of forces measured in?

• Kilograms
• Newtons (N)
• Meters
• Liters

Do several forces act on an object at the same time?

• Yes
• No

Fill in the blanks by choosing the correct words from the below:

The force you use is called the _______ and the opposite force you feel is called the _________.

• action

• mass

• weight

• reaction

Fill in the blanks:

Forces have _____ and ______.

• mass

• weight

• size

• direction

How do we represent force size and direction to others?

• As arrows

• The length shows how strong it is

• It points in the direction of the movement

• As lines

How are air resistance and friction related?

• Air resistance and friction are completely unrelated forces.
• Friction happens when two surface rub together.

• Air is a special kind of friction, because when an object moves through the air, it rubs against air particles.

• Air resistance and friction are related as they both oppose the motion of an object, causing it to slow down.

In which direction does air resistance act?

• Upwards
• Same direction of motion
• Downwards
• Opposite direction of motion

How are different objects affected by air resistance?

• Objects with larger surface areas or irregular shapes experience more air resistance.
• Objects with rough surfaces experience less air resistance.
• Objects with symmetrical shapes experience less air resistance.
• Objects with smaller surface areas experience more air resistance.