2024/2025 QUESTIONS AND ANSWERS GRADED
A+
If the speed at which an object moves through a fluid increases, will the size of the
frictional force that acts on it increase, decrease or stay the same?
increase
Is tension a contact or non-contact force?
contact
What name is given to the point at which the mass of an object may be considered
to be concentrated?
centre of mass/ centre of gravity
Object 1 has a low centre of mass and Object 2 has a high centre of mass. Which
object will be more stable?
,object 1
True or false? If the vertical line through an object's centre of mass falls within its
base of support then the object will topple over.
false
What is the SI unit for mass? Give the full name, not the symbol.
kilogram
Weight is the downward pull of __________ on mass. What one word completes
the sentence?
gravity
What is the main force that must be overcome in order to push an object along a
horizontal surface?
friction
A lift that weighs 300 N moves a man with a weight of 950 N upwards by 12 m.
How much work is done to move the lift this height?
,15,000
Look at the equation shown below. It can be used to find the force applied to an
elastic object. What does k represent? f=kxe
spring constant
True or false? Work must be done on an object in order to change its shape.
true
For a certain spring, k = 15N/m. A mass is hung from the spring, stretching it from
0.3m to 0.4m. What force did the weight produce?
1.5N
A spring is 14cm long. Three masses are hung from it and then it is measured
again. Now it is 19.5cm long. What force did the three masses provide? The spring
constant for the spring is 30N/m.
1.65N
, True or false? Objects that can regain their original shapes have energy in their
gravitational potential energy stores when their shape is changed by a force.
false
The spring constant, k, for a 22cm spring is 50N/m. A force is used to stretch the
spring and when it is measured again it is 32cm long. Work out the size of this
force.
5
A slinky is stretched by two forces. When the forces are removed, the slinky
returns to its original length. The slinky has been __________ deformed. What
word completes the sentence?
elastically
Johann squeezes a bagel too hard at the supermarket, and it does not return to its
original shape when he removes his hand. The bagel has been __________
deformed. What word completes the sentence to show that the bagel has been
permanently changed?
inelastically/nonelastically
True or false? In a linear relationship, a change in one variable will always result in
a change of the same size in the other variable.