Forces and motion
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Slide 1 - Tekstslide
Drag the symbol (blue) to the name (red)
mass
change in momentum
final velocity
initial velocity
force
momentum
acceleration
m
Δp
F
u
v
a
p
Slide 2 - Sleepvraag
Drag the units (blue) to the symbol(red)
m
Δp
v
u
F
p
a
m/s
m/s2
m/s
kgm/s
kgm/s
kg
N
Slide 3 - Sleepvraag
Slide 4 - Tekstslide
Newton's 2nd Law tells us that...
A
the greater the force, the smaller the acceleration
B
the greater the force, the greater the acceleration
C
the greater the mass, the smaller the acceleration
D
the greater the mass the greater the acceleration
Slide 5 - Quizvraag
A motorcycle has a mass of 200 kg, what force is needed to give it an acceleration of 7 m/s2?
A
28.6 N
B
1400 N
C
1400 kgm/s
D
140 N
Slide 6 - Quizvraag
A car has a mass of 1500 kg, what force is needed to give it an acceleration of 4 m/s2?
A
6000 N
B
60000 N
C
6000 kg
D
600 m/s2
Slide 7 - Quizvraag
What is the force needed to accelerate a 250 kg motorbike at 5 m/s2?
A
125 N
B
50 N
C
1250 N
D
500 N
Slide 8 - Quizvraag
The engine of a 300 kg motorbike produces a force of 1000 N. What is its acceleration?
A
300000 m/s2
B
0.3 m/s2
C
3.3 m/s
D
3.3 m/s2
Slide 9 - Quizvraag
The mass of a pilot and her seat in a fighter jet is 125 kg. When she ejects, she is subjected to an acceleration of 120 m/s2. What is the force acting on the pilot and the ejector seat?
A
1500 kg
B
1500 N
C
15000 m/s
D
15000 N
Slide 10 - Quizvraag
A car's engine produces a force of 1000 N and the car accelerates at 2.5 m/s2. What is the mass of the car?
A
400 N
B
4000 N
C
4000 kg
D
400 kg
Slide 11 - Quizvraag
A man accelerates at 15 m/s2 when doing the high jump using a force of 1200 N. What is his mass?
A
18,000 kg
B
0.0125 kg
C
80 kg
D
800 kg
Slide 12 - Quizvraag
Slide 13 - Tekstslide
When a skydiver jumps out of a plane...
A
There is lots of air resistance
B
There is no air resistance
Slide 14 - Quizvraag
When a skydiver jumps out of a plane, there is no air resistance, so the resultant force is...
A
Downwards
B
Upwards
Slide 15 - Quizvraag
When a skydiver jumps out of a plane, there is no air resistance, so the resultant force is downwards and the skydiver...
A
Accelerates downwards
B
Accelerates upwards
C
Decelerates
D
Falls at a constant speed
Slide 16 - Quizvraag
The faster the skydiver falls...
A
Air resistance doesn't change
B
The smaller the air resistance
C
There is still no air resistance
D
The bigger the air resistance
Slide 17 - Quizvraag
Eventually, air resistance becomes equal to weight so the skydiver falls at...
A
interval velocity
B
consistent velocity
C
terminal velocity
D
constant velocity
Slide 18 - Quizvraag
The skydiver then opens their parachute. The larger the surface area of a skydiver's parachute...
A
The smaller the air resistance
B
The bigger the air resistance
Slide 19 - Quizvraag
When a skydiver opens their parachute, air resistance is bigger than weight so...
A
the resultant force is downwards
B
the resultant force is upwards
C
there is no resultant force
D
air resistance and weight aren't important
Slide 20 - Quizvraag
When a skydiver opens their parachute, air resistance is bigger than weight so the resultant force is upwards and the skydiver...
A
accelerates
B
decelerates
C
there is no change in velocity
Slide 21 - Quizvraag
Which number represents where weight is equal to air resistance?
A
1
B
2
C
4
D
8
Slide 22 - Quizvraag
Which number represents where weight is bigger than air resistance?
A
1
B
2
C
5
D
6
Slide 23 - Quizvraag
Which number represents where weight is smallerthan air resistance?
A
2
B
4
C
6
D
7
Slide 24 - Quizvraag
Slide 25 - Tekstslide
Momentum is a
A
scalar
B
vector
Slide 26 - Quizvraag
A rugby player has a mass of 85 kg and sprints at 5 m/s. What is his momentum?
A
425 m/s2
B
17 kgm/s
C
17 m/s2
D
425 kgm/s
Slide 27 - Quizvraag
A truck has a mass of 5000 kg and a velocity of 5m/s. Calculate its momentum.
A
1000 kgm/s
B
2500 kgm/s
C
10000 kgm/s
D
25000 kgm/s
Slide 28 - Quizvraag
The lorry is about to hit the stationary car. Assume they stick together. How fast will they move afterwards?
A
0 kg m/s
B
3500 kg
C
55000 kg m/s
D
15.7 m/s
Slide 29 - Quizvraag
Slide 30 - Tekstslide
A car has a mass of 2000 kg. Its velocity changes from 5 m/s to 10 m/s in 5 seconds. What force causes this change in velocity?
A
200 N
B
200 kg
C
2000 kg
D
2000 N
Slide 31 - Quizvraag
A toy car has a mass of 2 kg. Its velocity changes from 2 m/s to 5 m/s, with a force of 4 N. How long does this change in velocity take?
A
10 s
B
1.5 s
C
2.5 s
D
5 s
Slide 32 - Quizvraag
A force of 500 N acts on a 1000 kg car for 10 s. Its initial velocity was 2 m/s. Calculate its final velocity.
A
4 m/s
B
5 m/s
C
6 m/s
D
7 m/s
Slide 33 - Quizvraag
To reduce the impact force...
A
decrease the time taken
B
increase the time taken
C
decrease the surface area
D
increase the surface area
Slide 34 - Quizvraag
The picture shows rubber tiles used for playground flooring. Explain how these can reduce injury to children.
