how much distance is covered over a period of time

the change in the location of a object

What is happening at E?

Steady speed; returning to start position

Fast steady speed; moving away from the starting position

A girl is pushing a cart by herself with a force of 7 N. What will happen if a boy begins to help her and their combined force is 17 N?

The cart will move at a constant speed in a straight line.

The cart will fly to never never land!

The boat moves to the left at a speed of 4 m/s . The current moves to the right at 2 m/s . What will happen if the current increases to 3 m/s ?

The boat will continue sailing to the left at a constant speed of 4 m/s.

Balanced forces can cause

an object to stay still or move at a constant speed and direction

an object to speed up or slow down

An unbalanced force can make all of these things happen except...

a moving object changes direction

Which of the following statements is true?

Unbalanced forces cause a change in motion.

Balanced forces cause a change in motion.

Forces do not effect the change in motion.

If all four forces are balanced, the plane will

fly at a constant speed and not change direction

Which of the following has a net force of 0 Newtons?

An asteroid moving at a constant speed and direction through space

A car slowing down at a stop sign

A box of dishes falling from a counter

Which could be an example of an unbalanced force?

A baseball that has just been thrown to home plate.

A plate sitting on a dining table

A ball at the top of a hill that is not moving

A soccer ball kicked in space, traveling at a constant speed in a straight line

Why does a book on a table not move?

The forces of the table pushing up and gravity pulling down are balanced

No forces are acting on the book

Gravity is the only force acting on the book

Mi

Quiz

•

Science

•

8th Grade

•

Practice Problem

•

Hard

•

NGSS

MS-PS3-1, MS-PS2-2, 3-PS2-1

+4

Standards-aligned

Charles Martinez

FREE Resource

95 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

5 mins • 1 pt

A runner races in the 100 meter dash. It takes her 10 seconds to finish. What is her average speed?

10 m/s

1000 m/s

100 seconds

10 seconds

Dave runs a 400 m race with a speed of 4 m/s. What time will it take him to finish the race?

400 minutes

100 minutes

100 seconds

.25 seconds

3.

MULTIPLE CHOICE QUESTION

3 mins • 1 pt

Which of the following is a unit of time?

sec

mi

m/s

km

4.

MULTIPLE CHOICE QUESTION

3 mins • 1 pt

Which of the following is a unit of speed ?

sec

mi

m/s

min

Which of the following is a unit of distance ?

miles/hr

mi

s

min

6.

MULTIPLE CHOICE QUESTION

3 mins • 1 pt

Which of the following is a unit of distance ?

miles/hr

hr

km

min

7.

MULTIPLE CHOICE QUESTION

3 mins • 1 pt

Which of the following is a unit of time?

km/hr

hr

km

mi

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Mi

95 questions

A runner races in the 100 meter dash. It takes her 10 seconds to finish. What is her average speed?

Dave runs a 400 m race with a speed of 4 m/s. What time will it take him to finish the race?

Which of the following is a unit of time?

Which of the following is a unit of speed ?

Which of the following is a unit of distance ?

Which of the following is a unit of distance ?

Which of the following is a unit of time?

Which of the following is a unit of speed?

A train travels 25 km in .5 hrs. How fast is the train going?

How long would it take a bus traveling at 50 km/h to travel 125 km?

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