11 Physics Forces and Motion

What causes an object to move?

• When balanced forces act on an object

• When unbalanced forces act on an object

• When the total force acting on the object equals zero

• Both a and c

The SI unit of force is the...

• Joule

• Meter

• Kilogram

• Newton

When an unbalanced force acts on an object...

• The objects motion does not change

• The weight of the object decreases

• The object accelerates

• The inertia of the object increases

The forces acting on a falling leaf are...

• air resistance and fluid friction

• gravity and air resistance

• gravity and static friction

• weight and rolling friction

If a force of 12 N is applied to an object with a mass of 2kg, the object will accelerate at...

Your weight equals your..

• mass

• mass divided by the net force acting on you

• mass times acceleration due to gravity

• mass times your speed

Newton's third law of motion describes

• action and reaction forces

• centripetal forces

• balanced forces

• net force

Newton first law of motion is?

• Law of attraction

• Law of acceleration

• Law of inertia

• Law and order

For every action force or momentum there is an equal and opposite reaction force or momentum.

• Newtons first law states

• Newtons second law states

• Newtons third law states

• All newtons laws if motion state

Define the term Centre of gravity

• Force applied through the centre of gravity of an object

• The point in space around which an object rotates

• A force applied to one side of the centre of gravity

• A point on a body at which the earths gravitational pull is concentrated