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WorksheetsForces & Energy
Total questions: 18
Worksheet time: 17mins
Which statement is correct?
Mass is a force, measured in kilograms.
Mass is a force, measured in newtons.
Weight is a force, measured in kilograms.
Weight is a force, measured in newtons.
Three children, X, Y and Z, are using a see-saw to compare their weights.
Which line in the table shows the correct order of the children’s weights?
heaviest ←→ lightest
XY Z
XZ Y
YX Z
YZ X
A spring is suspended from a stand. Loads are added and the extensions are measured.
Which graph shows the result of plotting extension against load?
Which quantities are measured in the same unit?
energy, power and work
energy and power, but not work
energy and work, but not power
power and work, but not energy
Five identical bags of rice are balanced on a uniform beam by an object of mass 10kg. Two more identical bags of rice are added to the other five. The average position of the bags on the beam does not change. What mass now balances the bags?
3.5kg
7.0kg
12kg
14kg
Two farmers use an electrically powered elevator to lift bales of hay. All the bales of hay have the same mass
As sunset approaches, they increase the speed of the motor so that more bales are lifted up in a given time. How does this affect the work done in lifting each bale and the useful output power of the motor?
Each diagram shows a metal plate with four parallel forces acting on it. These are the only forces acting on the plates. In which diagram is the plate in equilibrium?
A student runs up a flight of stairs.
Which information is not needed to calculate the rate at which the student is doing work against gravity?
the height of the flight of stairs
the length of the flight of stairs
the time taken to run up the stairs
the weight of the student
The lamp in the diagram is not very stable and falls over easily.
narrower base, higher centre of gravity
narrower base, lower centre of gravity
wider base, higher centre of gravity
wider base, lower centre of gravity
A load is hung from a steel wire. The load is increased. The length of the wire increases until the limit of proportionality is reached. The load is now increased slightly. What happens?
The extension of the wire increases and the wire no longer obeys Hooke’s law.
The extension of the wire decreases and the wire no longer obeys Hooke’s law.
The extension of the wire increases and it obeys Hooke’s law.
The extension of the wire decreases and it obeys Hooke’s law.
An object decelerates from 25.0 m / s to 5.0 m / s in a time of 4.0 s. It has a mass of 50kg. What is the resultant force on the object?
0.63N
10N
250N
4000N
A beam is pivoted at one end, as shown. The beam weighs 6.0 N and its weight acts at a point X, 40 cm from the pivot.
A force of 4.0N is applied to the beam causing it to balance horizontally.
In which direction and where is the 4.0 N force applied?
downwards at 20cm to the left of X
downwards at 20cm to the right of X
upwards at 20cm to the left of X
upwards at 20cm to the right of X
The work done W by a force is related to the magnitude F of the force and the distance d moved in the direction of the force.
Which equation for W is correct?
W = d ÷ F
W = d + F
W = F ÷ d
W = F × d
A crane on a construction site lifts concrete beams. The useful work done by the crane is 4000 kJ in a time of 160 s.
What is the useful output power of the crane?
0.04 kW
25W
25 kW
640 kW
A man holds a short ladder in four different positions. The weight of the ladder causes a moment about the man’s shoulder. In which position is the moment greatest?
A
B
C
D
A hole is drilled in a square tile. The diagram shows the tile hanging freely on a nail. Where is the centre of mass of the tile?
A
B
C
D
Which expression gives the momentum of an object?
mass × acceleration
mass × gravitational field strength
mass × velocity
½ × mass × (velocity)2
A wooden plank rests in equilibrium on two rocks on opposite sides of a narrow stream. Three forces P, Q and R act on the plank. How are the sizes of the forces related?
P + Q = R
P + R = Q
P = Q = R
P = Q + R
