Practice for PS10 Test - Force and motion

What is the difference between speed and velocity?

• Speed is measurable and velocity is not measurable.

• Speed can change with time and velocity doesn't change with time.

• Velocity is speed with direction.

• Velocity is a change in speed.

When does acceleration occur?

• When velocity increases.

• When velocity decreases.

• When velocity changes direction.

• all of the above

Which car is the fastest?

• Car A

• Car B

• Car C

• Car D

Tags

NGSS.MS-PS3-1

What is the speed of Car B

• 80 km/hr

• 20 km/hr

• 4 km/hr

• 320 km/hr

Tags

NGSS.MS-PS3-1

Which is the result of using a more powerful motor to run an elevator?

• The same amount of work is done in less time.

• Less work is done in the same amount of time.

• The same amount of time is needed to move the same distance.

• A longer time is needed to move a shorter distance.

Which of these has the strongest gravitational field?

• Earth

• Moon

• Sun

• Jupiter

Use the formula W= Fd and P = W/t

Kayla climbs a set of stairs. She moved 500N of force a distance of 2 meters. If it takes her 10 seconds, what is her power?

• 500 watts

• 1000 watts

• 100 watts

• 200 watts

Tags

NGSS.MS-PS3-4

A student measured the power of a motor operating at different temperatures. The student recorded a total of 11 measurements, one at each 2 degree interval between 10^oC and 30^oC. Which change in the procedure would most improve the validity of conclusions based on this investigation?

• Increase the number of levels of Independent variables.

• Decrease the number of levels of Independent variables.

• Repeat the experiment several times.

• Produce a graph to represent the data.

Tags

NGSS.MS-PS3-1

Bert and Ernie unloaded books from boxes on the floor and put them on shelves 1 m above the floor. Bert unloaded 50 kg of books in 10 min, and Ernie unloaded 50 kg of books in 20 min. Which of the following statements is true? Use the formulas:

P=W/t

W = Fd

• Bert did more work than Ernie.

• Ernie did more work than Bert.

• Bert did the work with more power than Ernie.

• Ernie did the work with more power than Bert.

Tags

NGSS.MS-PS3-5

The screwdriver is being used as a lever to open the paint can. If the screwdriver is LONGER it will ---

• not change the force needed to open the can.

• decrease the force needed to open the can.

• increase the force needed to open the can.

• there is no way to predict what will happen.

Tags

NGSS.MS-ETS1-1