P2 2.1 Forces Between objects

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P2 2.1 Forces Between objects
When two objects interact (push or pull), they
exert equal and opposite forces on each other.
10N
10N
What happens?
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P2 2.1 Forces Between objects
The skaters move towards each other
When two objects interact (push or pull), they
exert equal and opposite forces on each other.
10N
10N
What happens?
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P2 2.1 Forces Between objects
At any stage this is true
Ft
F c
But to pull the car out of the mud Ft gt F c
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What happens if there isnt enough friction ?
Friction acts where the tyre is in contact with
the road. (even when accelerating or braking)
Wheel slides
What happens if a car accelerates while its
wheels are on carpet mats?
Carpet mats move backwards, car moves forwards
(a little)
5
Trolley pulled along a flat runway
(Not showing vertical forces)
5 N
5 N
1 Kg
Ft
Ft
Fr
Fr
What would happen if the trolley got stuck on the
runway?
You pull the runway along too!
6
A floating ball
Equal and opposite forces act on different
objects act in opposite directions are the
same type of force act along the same line
D
C
B - weight (force of gravity on the ball) A -
gravitational pull of ball on the earth
B
C - contact force of water on ball (Upthrust) A
- contact force of ball on the water
A
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A floating ball
Paper clips held by a magnet
D
N S
C
H
G
B
Equal and opposite forces act on different
objects act in opposite directions are the
same type of force act along the same line
A
F
E
8
A book at rest
A stretched spring
S
P
Q
R
U
V
X
Y
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