A and B collide and stick together at rest. B exerts a force +F on A. According to N3:

there is a force –F acting on object A., there is a force –F acting on object B.

An object undergoes circular motion. The direction of acceleration is:

Identical to the direction of the unbalanced force

A ball falls in air and speed is tracked over time as shown. What is true at T?

ΔEp is greater than the gain in kinetic energy.

Which of the following is the condition for a body to be in translational equilibrium?

The resultant force on the body in any direction is 0

The graph shows the variation of a ball's momentum as it hits a wall. Which is true?

The gradient = the force exerted by the wall on the ball

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Mechanics and Circular Motion

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An first year IB physics quiz to help review concepts of Newton's laws, forces, momentum, circular motion, and gravitation.

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Questions 12

Answers

1
A constant force F is applied to m for a time Δt. The impulse given to the mass is
FΔt
F/m
F/Δt
(FΔt)/m
2
A car of m=100kg drives at speed v around a circular track of r=10m. What is the work done?
10 J/s
No way of knowing.
980 J/s
zero
3
The weight of an object of mass 1 kg on Mars is 4N. R_Mars=1/2 R_Earth. What is M_Mars/M_Earth?
10
0.2
5
0.1
4
A and B collide and stick together at rest. B exerts a force +F on A. According to N3:
there is a force –F acting on object A.
there is a force +F acting on object B.
there is a force –F acting on object B.
there is a force +F acting on object A.
5
An object undergoes circular motion. The direction of acceleration is:
Tangential to the circle at that point.
Identical to the direction of the unbalanced force
Identical to the direction of speed
Identical to the direction of velocity
6
A general expression for N2 is F=Δp/Δt. What condition is applied so that we may say F=ma?
The mass m is constant
The direction of the force F is constant
The acceleration a is constant
The force F is constant
7
A ball falls in air and speed is tracked over time as shown. What is true at T?
ΔEp is equal to the gain in kinetic energy.
ΔEp is greater than the gain in kinetic energy.
ΔEp is equal to the work done against air resistance.
ΔEp is less than the work done against air resistance.
8
Which of the following is the condition for a body to be in translational equilibrium?
The resultant force on the body in any direction is 0
The velocity of the body in any direction is zero
No external force is acting on the body
no work is done on the body
9
2 objects with speed v collide and stick together. The final velocity of the new object is
less than v
more than v
v
2v
10
P(2.0kg) and Q(4.0kg) move at a constant speed. The resultant force, F must be
30 N
5.0 N
0 N
15 N
11
The graph shows the variation of a ball's momentum as it hits a wall. Which is true?
The shaded area = the force exerted by the wall on the ball.
The gradient = the force exerted by the ball on the wall
The gradient = the force exerted by the wall on the ball
The shaded area = the force exerted by the ball on the wall.
12
A skydiver of mass 60.0kg falls at a constant speed. The force due to air resistance is
700 N
588 kg m s-2
588 N
60 kg m s-2

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