Kinematics Review APC

Displacement is which of the following types of quantities?

• vector

• scalar

• magnitude

• dimensional

A truck moves 70 m east, then moves 120 m west, and finally moves east again a distance of 90 m. If east is chosen as the positive direction, what is the truck's resultant displacement?

• 40 m

• -40 m

• 280 m

• -280 m

• 230 m

Which of the following is not a vector quantity?

• temperature

• velocity

• acceleration

• displacement

• force

In one-dimensional motion, the average speed of an object that moves from one place to another and then back to its original place has which of the following properties?

• It is positive.

• It is negative.

• It is zero.

• It can be positive, negative, or zero.

• It isn't zero

An object moves 20 m east in 30 s and then returns to its starting point taking an additional 50 s. If west is chosen as the positive direction, what is the sign associated with the average velocity of the object?

• +

• -

• 0 (no sign)

• all of the above

• It isn't zero

An object moves 20 m east in 30 s and then returns to its starting point taking an additional 50 s. If west is chosen as the positive direction, what is the average speed of the object?

• 0.50 m/s

• -0.50 m/s

• 0.73 m/s

• -0.73 m/s

• 0 m/s

A cheetah can run at approximately 100 km/hr and a gazelle at 80.0 km/hr. If both animals are running at full speed, with the gazelle 70.0 m ahead, how long before the cheetah catches its prey?

• 12.6 s

• 25.2 s

• 6.30 s

• 10.7 s

• 6.30 s d. 10.7 s e. 20.3 s

An automobile driver puts on the brakes and decelerates from 30.0 m/s to zero in 10.0 s. What distance does the car travel?

• 150 m

• 196 m

• 336 m

• 392 m

• 421 m

Tags

NGSS.HS-PS2-1

A Cessna aircraft has a lift-off speed of 120 km/hr. What minimum constant acceleration does this require if the aircraft is to be airborne after a take-off run of 240 m?

• 2.31 m/s²

• 3.63 m/s²

• 4.63 m/s²

• 5.55 m/s²

• 6.12 m/s²

Tags

NGSS.HS-PS2-1

If the displacement of an object is given in SI units by Δx = -3 t + 4 t², at t = 2 s its velocity and acceleration are, respectively:

• positive, positive

• positive, negative

• negative, negative

• negative, positive

• negative, zero