Grade 5: Force, Motion & Energy

Question 1

Is a push or a pull?

Answer 1

Force

Question 2

It can cause a change in motion. It can also change an object’s direction and it may also act on objects to change their shape or size.

Answer 2

Force

Question 3

Force may be described in terms of _______ and _______.

Answer 3

magnitude
direction

Question 4

The strength of the force is referred to as ________.

Answer 4

magnitude

Question 5

Magnitude of a force is measured in units called ______.

Answer 5

newton (N)

Question 6

The ____ tells in which way a force is acting on an object.

Answer 6

direction

Question 7

What is Newton’s first law of motion or the law of inertia?

Answer 7

An object at rest tends to remain at rest. An object in motion tends to move at a constant speed in a straight line unless acted upon by an unbalanced external force.

Question 8

Is the force that opposes motion?

Answer 8

Friction, sometimes called frictional force.

Question 9

What is unbalanced force?

Answer 9

To have unbalanced force means that the force applied in one direction is greater than the force applied in the opposite direction.

Question 10

What happened when unbalanced forces are acting on an object?

Answer 10

There is change in speed and or direction.

Question 11

What is Newton’s second law of motion or the law of acceleration?

Answer 11

An object’s acceleration is directly proportional to the net force acting on it and is inversely proportional to the object’s mass.

Question 12

What do you mean by direct proportion?

Answer 12

It means that when one factor increases, the other factor also increases.

Question 13

What do you mean by inverse proportion?

Answer 13

It means that when one factor increases, the other factor decreases.

Question 14

What do you mean by balance force?

Answer 14

When two forces are the same strength but act in opposite direction. They do not result in motion.

Question 15

What is Newton’s third law of motion or the law of interaction?

Answer 15

For every action, there is always an equal and opposite reaction.

Question 16

How does location relate to motion?

Answer 16

If there is a change in location in relation to a fixed object, there is motion.

Question 17

The fixed object is called?

Answer 17

reference point.

Question 18

How do you define motion?

Answer 18

As a change in position in relation to a reference point. It can be described using the terms speed, velocity, or acceleration.

Question 19

What is the formula in getting the speed?

Answer 19

Speed = Distance/Time

or

v = d/t

Question 20

What is speed?

Answer 20

Is the distance traveled by an object per unit time.

Question 21

Provide other examples of units of distance over time?

Answer 21

meters per second = m/s

centimeters per second =cm/s

meters per hour = m/h

kilometers per hour = km/h

Question 22

Why do you think that the direction in which a typhoon moves is very significant?

Answer 22

It will warn residents if the typhoon is likely to hit in their area or not.

Question 23

Speed with direction indicates?

Answer 23

velocity.

Question 24

What is the significance of the arrow above the speed sign formula?

Answer 24

Without the arrow, v simply means speed and indicates no direction. With an arrow, the symbol represents velocity and has direction.

Question 25

How do you specify direction in expressing velocity?

Answer 25

We may include the major directions (east, west, north, and south) or the directions in between (northeast, northwest, southeast, and southwest). We may also mention the destination to indicate direction.

Question 26

What is acceleration?

Answer 26

The change in velocity at a given time.

Question 27

Under what conditions may acceleration be observed?

Answer 27

1. Change in speed
   -accelerating (speeding up)
   -decelerating (slowing down)
2. Change in direction
   acceleration (a) may be expressed as a change in velocity per unit time.

(refer to your book page 141 for the formula)

Question 28

What are factors that affect acceleration?

Answer 28

amount of force applied

amount of mass

Question 29

How do you increase the acceleration of an object?

Answer 29

By increasing the force exerted on it. Increasing the force applied to an object increases its acceleration.

Question 30

What would happened when the force exerted is constant in terms of acceleration?

Answer 30

an object with more mass accelerate less.

Question 31

Can you try to summarize the factors that affect acceleration.

Answer 31

In summary, if mass is constant, increasing the force, exerted on an object will increase its acceleration. If the force exerted is constant, an object with more mass accelerate less.

Question 32

What is a hydrofoil?

Answer 32

Is a mode of water transportation. It moves faster than ships and boats. They have underwater wings that are similar to airplane wings.

Question 33

A hydrofoil wing develops an upward force called ____ as it moves through the water.

Answer 33

lift