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1. What two measurements are needed
to calculate the average speed of an object?
answer
Distance and Time
What equation would be
used to calculate average speed?
2.
answer
Speed = distance / time
3.
A trolley takes 1.5 s to
travel 60cm
Calculate its average speed.
.
answer
v = d/t
= 60 / 1.5
= 40 cm/s
Does a car speedometer give
average or instantaneous speed?
4.
answer
instantaneous
Give one advantage of using an
electronic timer rather than a hand
held stopwatch.
5.
answer
Removes effect of reaction
time
6.
What is meant by the term
acceleration?
answer
Change in speed per
second
7.
Acceleration is measured in metres
per second per second.
Write this in symbol form.
answer
m/s/s or m/s2or ms-2
8.
What equation is used to find
acceleration?
answer
a = (v-u)/t
9.
An object starts from rest and
reaches 8m/s after 4s .
Find the acceleration.
answer
a = (v-u) / t
= (8-0)/4
2 m/s2
10. The times for 4 cars to reach 100 km/h
are shown below.
Which car has the greatest acceleration?
answer
Car
Time(s)
A
10.1
B
8.3
C
16.4
D
12.9
Car B
(shortest time to go
from 0 – 100 km/h)
11. Describe the motion of the object
represented by the speed – time graph
below.
Speed
o
Constant Speed
time
answer
12.
The velocity – time graphs for two
objects are shown below
Which object has the larger acceleration.
A
speed
B
answer
time
O
Object A –
steepest slope
13. What is represented by the area
under a speed- time graph?
answer
Distance travelled
14. State three effects of a force.
answer
Change of speed,
shape and direction.
15. What is the unit of Force?
answer
Newtons (N)
16. Name an instrument which can
be used to measure forces.
answer
Newton balance or
spring balance.
17.
What is a Scalar Quantity?
Give examples.
answer
Scalar quantities can be described
completely by their size or magnitude.
e.g.
Distance, time, mass and speed
18. What is a vector?
Give examples.
answer
Vectors are quantities with a
magnitude and a direction.
e.g.
Weight, displacement,
acceleration and velocity.
What is the difference
between speed and velocity.
19.
answer
Velocity = displacement/time
(vector)
Speed = distance / time
(scalar)
20. Which force always opposes the
motion of an object?
answer
Friction
21.The forces on the object below
are balanced.
answer
50N
50N
F
22. The forces on an object are balanced.
Describe the possible motion of the
object.
answer
Stays at rest or moves with constant speed in a
straight line.
23. An unbalanced force causes an
object to accelerate.
What will affect the size of the
acceleration?
answer
The size of the unbalanced force and the mass of
the object
24.
A dog runs 300m south then turns and
runs a further 400m east in a total time of 50s.
What is the dog’s displacement from its starting
position and its average velocity?.
answer
400m
300m
We use SOH CAH TOA to work
out angle x° which we need to give
the direction.
tan X
x°
x°
= 400/300
= tan-1 (400/300)
= 53.1°
300m
400m
This is the resultant
displacement, the
magnitude can be calculated
by Pythagoras.
S = √(3002 + 4002)
S = 500m
25.
A 4kg object has an acceleration of 5m/s2.
Find the unbalanced force acting on the object.
answer
F=mxa
=4x5
= 20N
26. Find the acceleration of the object
shown below.
answer
2m/s2
10kg
20N