Physics 11

Momentum is a vector quantity defined as an object's

• mass and acceleration

• mass and speed

• mass and velocity

• force and time

Few collisions are

• planned

• inelastic

• elastic or inelastic

• elastic or perfectly inelastic

In inelastic collisions,

• kinetic energy is conserved.

• kinetic energy is not conserved, some is converted to internal and sound energy

• Kinetic energy cannot be calculated in a collision

• No work is done

When a collision happens between two masses and the masses move as one object with a common velocity

after the collision, this is

• an elastic collision

• a perfectly inelastic collision

• inelastic collision

• accidental collision

The formula for change in momentum is:

• FΔt = Δp

• WΔt = Δp

• ΔpΔt = F

• pΔt = ΔF

According to impulse-momentum theory

• Density of an object determines its power

• Work is changed by how much time is spent on it.

• An object's inertia determines its momentum

• Force can be changed by impact time

Highway engineers use impulse-momentum theorem helps predict

• How high up to put traffic lights

• stopping times and distances

• speed and road surfaces

• accelerations and oil change times

FΔt describes the

• Work done

• density

• impulse of the force for time interval t

• Specific gravity

FΔt = p

• The impulse-momentum theorem

• The impulse-density theorem

• If we eat peas, we get fΔt

• FΔt PΔt

A 1000 kg meteorite moving eastward with a velocity of 100 m/s collides with a utility pole and is brought to rest in 0.2 seconds. Find the force exerted on the meteorite during the collision.

• 5.0 x 10⁴ N to the east

• 5.0 x 10⁴ N to the west

• 5.0 x 10⁵ N to the east

• 5.0 x 10⁵ N to the west