physics midterm review

What is the Formula for speed?

• s=t/d

• s=2dt

• s=d/t

• s=td/2

what is impulse?

• force and velocity

• time and velocity

• ones heartbeat

• change in momentum

how are acceleration and velocity related?

• acceleration is the rate of change of velocity in time.

• time is the rate of change in velocity in acceleration.

• they are not related.

• they are the same thing.

is a car stopping for a red light accelerating?

• yes, because its changing its velocity.

• no because its slowing down.

• yes, because its a car and all cars accelerate

• no because stopping is not moving, which means no acceleratio n.

what is momentum?

• only direction

• somethings magnitude and gravity

• movement, magnitude and direction

• only magnitude

what is the acceleration of a car that travels in a straight line at a constant speed of 100km/hr?

• 0km/hr

• 50km/hr

• 100km/hr

• cannot know with just the information given.

if an object is not accelerating, does that mean there are no forces acting on it?

• yes, acceleration is the only thing acting on an object.

• no, gravity will be acting on it.

a 2kg blob of putty moving at 3m/s slams into a 2kg blob of putty at rest. the two stuck together. is this an elastic or inelastic collision?

• elastic

• inelastic

how does mass affect acceleration?

• when one grows, the other shrinks, inversely

• directly proportional

• it doesn't affect it.

• mass will always make the acceleration faster.

what is the equation for horizontal projectile motion?

• v=td

• v=d/t

• v=gt

• v=dt/2