Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Year 9 > Physics unit 1 > Flashcards

Physics unit 1 Flashcards

1
Q

What is a force?

A

The push or pull on an object with mass which causes it to change its velocity

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

What is the SI unit for force?

A

Newtons

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

What is the difference between contact and non contact forces?

A

Contact forces need objects to be physically touching in order to act, non contact forces act over a distance

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

What is speed?

A

The distance covered per unit time. It is measured using the formula S=D/T. The SI unit is m/s

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

What is the difference between balanced and unbalanced forces?

A

Balanced forces are equal in size and opposite in direction, whereas unbalanced forces aren’t. Balanced forces do not cause a change in motion whereas unbalanced forces can change the shape, speed or direction of an object. When forces are balanced, the resultant force is 0N.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

How is mass measured?

A

In Kilograms (kg)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

How is weight measured?

A

In Newtons (N)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

What is the equation for weight?

A

W=m*gravity (g)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

What is the gravity on Earth?

A

9.8 m/s^2

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

What is the difference between mass and weight?

A

mass is the amount of matter in an object and weight is the effect of gravity on that mass

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

What is a scalar?

A

A scalar is a quantity that only has size
Examples:
-Distance
-Speed
-Mass
-Energy

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

What is a vector?

A

A quantity that has size and direction
Examples:
-displacement
-velocity
-acceleration
-force
-weight

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

What is displacement?

A

How far the object is from the original distance

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

What is distance?

A

How far an object travels. The SI unit is metres (m)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

What is velocity?

A

How fast an object travels in a given direction

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

What is the equation for velocity?

A

Velocity=displacement/time

17
Q

What is a resultant force?

A

The net force/overall effect of all the forces acting on an object

18
Q

What is a resultant vector?

A

The combination of 2 or more single vectors.

19
Q

What is Newton’s third law?

A

Every action has an equal and opposite reaction. When 2 objects interact, they exert equal and opposite forces on each other. The forces are acting on different objects. It explains how objects are able to move

20
Q

How do you calculate resultant force?

A

If forces are acting in the same direction, they are added. If they are acting in opposite directions, they are subtracted and if they are perpendicular the resultant can be found using a scale drawing.

21
Q

what is acceleration?

A

the rate of change in velocity. This could be an object speeding up, slowing down or changing direction. Acceleration is a vector quantity. it is measured in m/s^2.

22
Q

what is the formula for acceleration

A

acceleration (m/s^2)=change in velocity (m/s)/time (s)

-to calculate the change in velocity you subtract the initial velocity from the final velocity

23
Q

What is a negative acceleration (an object slowing down) called?

A

deceleration

24
Q

how does acceleration affect air resistance?

A

as objects speed up, air resistance increases

25
Q

What is newton’s first law

A

an object’s motion will not change unless acted upon by an unbalanced force (a non-zero resultant force)

26
Q

What is inertia

A

the tendency of objects to continue in their state of motion

27
Q

What does it mean if the resultant force is 0N

A

The forces are balanced and the object is in equilibrium. The object will continue stationary if it is still and an object in motion will continue moving at the same velocity

28
Q

What happens if the resultant force is not 0N

A

The forces are unbalanced. A stationary object will accelerate in the direction of the resultant force. An object in motion will also accelerate in the direction of the resultant force

29
Q

What is a gradient

A

the steepness of the slope at any point. On a straight line, the gradient is constant. On a curved line, the gradient changes at every point.
The gradient can be positive (sloping upwards), negative (sloping downwards) and zero (horizontal)

30
Q

How do you calculate the gradient?

A

change in (triangle) y/ change in x

to calculate the gradient we need to know the coordinates of the start and the end

31
Q
A

Year 9 (6 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2025 Bold Learning Solutions. Terms and Conditions