Physics - Final Test

What is displacement?

• the change in position of an object

• how much an object moves

• the way that an object moves

• how fast an object moves

What is acceleration?

• change of velocity per unit of time

• change in speed

• how much an object speeds up

• change in displacement over time

What kind of quantity is velocity?

• a vector quantity

• a scalar quantity

• neither of these

If an object has negative acceleration, it means...

• The velocity is increasing

• The velocity is decreasing

• The velocity is constant

• The object is stationary

A boat sailing against the current experiences a negative acceleration of 10 m/s2. If the boat’s initial velocity is 40 m/s upstream, how long until it comes to a stop?

• 4 s

• 9.8 s

• 4.4 s

• 12 s

Weight is calculated by

• mass X gravity

• mass X velocity

• acceleration X velocity

The weight of a cart with a mass of 150 kg is ___ N.

(Use 9.8 m/s² for g)

Outside wooden steps may get slippery when they are wet. How could you make them less slippery? Choose 3.

• give the steps a rougher surface

• cover the steps with sandy paint

• increase friction

• pour oil on them

• wear rubber soled shoes

The force of friction always __________________ motion.

• opposes

• adds to

• does not affect

Newton’s third law of motion states that every action has a(n) _____________ and ____________ reaction.

• gentle and appropriate

• unequal and opposite

• equal and opposite