Q4 PT Science 9

What is the symbol for momentum?

• m

• v

• p

• I

Momentum is directly proportional to an object's:

• volume and acceleration

• mass and velocity

• force and time

• inertia and gravity

The unit for momentum is:

• kg·m

• kg⋅m/s

• c) kg·m/s

• d) N·s

Impulse is equal to:

• force x distance

• mass x acceleration

• change in momentum

• kinetic energy

If the impact time is longer, the impact force is:

• bigger

• smaller

• unchanged

• doubled

What is an important strategy to obtain greater momentum in sports?

• quick stop

• follow-through

• high jump

• fast turn

The total momentum of a system before and after a collision:

• increases

• decreases

• stays the same

• becomes zero

In the absence of external forces, the momentum of a system is:

• increased

• decreased

• conserved

• zero

Energy is commonly defined as the capacity to do:

• move

• work

• react

• heat

What is the unit of energy?

• Watt

• Newton

• Joule

• Pascal