Year 7 Physics

I can: understand forces, draw free body diagrams, know the difference between weight and mass.

• Yes! I'm all over it!

• I understand most of it.

• I have knowledge of some.

• What are forces?

A stationary object will

• move when it wants to.

• be affected by friction.

• be a house.

• remain stationary until a force acts upon it.

The forces acting on an apple in free fall are

• Gravity and the normal force.

• Friction and the normal force.

• Gravity and air resistance.

• The force of the mind.

The free body diagram for an apple in freefall is:

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Inertia is

• a force that opposes the resistance forces of an object.

• why we do not need seatbelts.

• every object's resistance to changing its speed and direction of travel.

• a village in Spain.

Weight is

• an objects mass multiplied by it's acceleration:

  w = m x a

• the amount of matter in an object in grams or kilograms.

• a property everything has.

• not important to forces.

Friction is

• always acting in the direction of motion.

• the opposite of gravity.

• not good for relationships.

• a resistive contact force which creates heat and slows an object.

A ship’s weight is balanced by the water it displaces pushing back upwards on its hull, this is called the

• gravity.

• buoyant force.

• air resistance.

• magic.

Which free body diagram shows a skydiver after the parachute has opened?

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