Exam code: XPH11
A hammer hits a nail. The force of the hammer on the nail and the force of the nail on the hammer form a Newton's third law pair.
Which statement about these two forces is not correct?
The two forces are equal in magnitude.
The two forces are the same type of force.
The two forces act on the same object.
The two forces act for the same length of time.
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Which of the following best describes gravitational field strength?
gravitational potential energy per unit mass
gravitational force per unit length
mass per unit weight
gravitational force per unit mass
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A person is pushing a trolley at a constant velocity.
The floor exerts a force P on the person, the person exerts a force Q on the trolley.
The trolley exerts a force R on the person and the total drag force on the trolley is S.
Which pair of forces is a Newton's Third Law pair?
P and R
Q and R
Q and S
P and S
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Which row of the table contains two units that are not equivalent?
| Unit 1 | Unit 2 |
A | J s–1 | W |
B | kg m s–2 | N s |
C | N kg–1 | m s–2 |
D | N m | J |
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The diagram shows a rocket of mass m accelerating upwards with acceleration a.
The diagram represents the forces acting on the rocket.
Which of the following equations gives the value of D?
D = T + m (g – a)
D = T + m (a + g)
D = T – m (g – a)
D = T – m (g + a)
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A van travels along a straight, horizontal road at a constant velocity.
Which of the following statements is correct?
The frictional force of the road on the tyres can be ignored.
The frictional force of the road on the tyres is equal to the resultant force on the van.
The frictional force of the road on the tyres is in the direction of motion of the van.
The frictional force of the road on the tyres is in the opposite direction to the motion of the van.
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A massive star exerts a gravitational force on a small distant planet. The planet exerts a gravitational force on the star.
Which row of the table is correct?
Magnitude of forces | Direction of forces | |
A | opposite | |
B | the same | |
C | opposite | |
D | the same |
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The graph shows how terminal velocity varies with mass for small spheres of equal diameter falling through a viscous liquid.
Which of the following describes the gradient of the graph for a liquid of greater viscosity?
a greater gradient
a smaller gradient
a variable gradient
the same gradient
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