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makenzi forces topic yr 7 exam > Forces Topic > Flashcards

Flashcards in Forces Topic Deck (22)
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0
Q

What is Gravity?

A

It is a force of attraction.

1
Q

Is Gravity a force of attraction

True or False?

A

True

2
Q

What are three ways in which a force changes an object .

A

Push, Pull , Twist.

3
Q

The unit used to measure force is called The ……

A

The Newton.

Remember symbol N.

4
Q

What do Arrows represent?

A

Arrows represent the force and the reaction force in a situation.

e.g -the bigger arrow ,the bigger force.

5
Q

What is the definition of Inertia?

A

It means to resist change in motion.

Eg :if you left your school bag in your room ,it would stay there until something happened to it ,this ability is called Inertia.

6
Q

A force can Be measured using a ……..balance?

A

A spring balance.

7
Q

All around us things move or are in ……?

A

Motion.

8
Q

Whenever there is a change in motion, a …… Has acted?

A

A force.

9
Q

What is the difference between acceleration and deceleration?

A

Acceleration means speeding up or getting faster.

Deceleration means losing speed or slowing down.

10
Q
Multiple choice
Mass is a measure of
A - Gravity
B- Weight
C -How much friction is needed
D- How much matter a object contains
A

Mass is a measure of how much matter a object contains

11
Q

How is weight measured?

A

On a scale.

12
Q

What is the difference between a temporary magnet and a permanent magnet?

A

One keeps a level of magnetism for a long time( permanent) and the other only keeps its magnetism when in a magnetic field( temporary)

Eg: A fridge door magnet is a permanent magnet
A paper clip is a temporary magnet remember these are a soft magnet.

13
Q

What is lightning?

A

Lightning is a giant spark of electricity produced by a thunderstorm.

14
Q

How does lightning work?

Hint: rain drops

A

Water droplets collide causing ion build up, positive charge at top of cloud negative charge at the bottom. Causing a discharge from positive to negative…..lightning bolt

15
Q

What is the definition of Friction?

A

When two surfaces make contact and can slow objects down.

16
Q

If you want to overcome inertia , you have to apply what?

A

Force.

17
Q
Multiple choice: Which one of the features in a car is not a safety feature?
A. Electronic Stability Control
B. Seatbelt
C.Steering Wheel
D. Airbags
A

C. steering Wheel

Other safety’s could be :
Anti lock breaking system
Auto emergency braking
Traction control

18
Q

What is lightning?

A. A Christmas light
B. A planet
C. A giant ring around the sun
D A giant spark of electricity

A

A giant spark of electricity.

19
Q
What is Inertia?
A - to resist change in motion.
B - to apply force
C - A car safety feature
D- A satellite
A

To resist change in motion.

20
Q
Multiple choice
Weight is a measure of
A- how strong gravity pulls on a object
B- How strong gravity pulls on mass
C- how strong gravity pulls on a force.
D- How strong gravity is.
A

A - How strong gravity pulls on an object.

21
Q

Definition of a force

A

Strength of physical action or movement