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Check what I know: Dynamics · G3 Physics and O-Level Physics

Check what you know about Dynamics, practise what needs work, then check your progress and return for a later review.

SEC G3 Physics 2027

Learning goals

Work through the questions and use the feedback to plan revision.

Check what I know

Check what I know: Dynamics · G3 Physics and O-Level Physics

A text-first Dynamics assessment with explicit bodies, force directions, masses, weights, drawing scales and motion descriptions.

About 8 minutes

Check what I know

Answer 10 short questions. This starting check helps choose what to work on; it does not prove mastery.

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This check needs JavaScript to record answers. The reviewed questions are listed below for study.

A skater standing on friction-free ice pushes horizontally on a rink wall with a force of 80 N, moves away from the wall, and then glides in a straight line at constant speed. Which account is correct?

The wall pushes her with 80 N in the opposite direction; that unbalanced force changes her velocity, and while gliding the forces on her are balanced, so her velocity stays constant.
Her 80 N push on the wall and the wall's 80 N push on her cancel, so she moves away only because her own push ends.
The wall pushes her with 80 N, but while gliding she needs a forward force to keep moving at constant speed.
The wall pushes her with less than 80 N, which is why she moves and the wall does not.

A 6.0 kg crate has a 50 N force right and a 14 N force left. What is its acceleration?

10.7 m/s² right
6.0 m/s² left
36 m/s² right
6.0 m/s² right

A crate slides right across a rough horizontal floor while a rope pulls it diagonally upward and right. Which description contains every external force on the crate?

Weight down, normal force up, rope tension diagonally up-right, and friction left
Weight down, normal force up, rope tension right, and motion right
Weight down, rope tension diagonally up-right, friction left, and resultant force right
Normal force up, rope tension diagonally up-right, friction right, and the crate's force on the floor down

A small ball is dropped from rest from a tall tower and falls through air. Which statement describes the effect of air resistance on its motion?

Air resistance acts upwards and grows as the ball speeds up, so its acceleration decreases until air resistance equals its weight and it falls at terminal velocity.
Its speed increases until air resistance equals its weight, and then it slows down to rest in mid-air.
Air resistance acts in the direction of motion, so it helps the ball speed up more quickly than in a vacuum.
Air resistance has the same size at every speed, so the ball falls with a constant acceleration smaller than 10 m/s².

Which pair consists of two contact forces that require the interacting objects to touch?

Friction and tension
Gravitational force and magnetic force
Friction and gravitational force
Tension and magnetic force

A sealed 2.4 kg sample is moved from one laboratory bench to another without adding or removing material. What is its mass after the move?

2.4 kg
0 kg
1.2 kg
4.8 kg

No test object is present at a point above a planet. Which statement about the gravitational field there is correct?

The field exists because a mass placed there would experience gravitational attraction.
The field appears only when a test object is placed there.
The field is material stored inside a test object.
The field cannot extend through empty space.

A 5.0 kg package is where gravitational field strength is 4.0 N/kg. Which record correctly interprets the field strength and gives the package's mass and weight?

Each kilogram experiences 4.0 N; mass 5.0 kg; weight 20 N.
Each kilogram experiences 0.25 N; mass 5.0 kg; weight 1.25 N.
Each kilogram experiences 4.0 N; mass 5.0 N; weight 20 kg.
Every object experiences 4.0 N; mass 5.0 kg; weight 4.0 N.

What shape do three force vectors form when a point mass is in equilibrium?

three arrows from one origin with no scale
an open triangle
a straight distance–time graph
a closed head-to-tail triangle

What is inertia?

the body's weight
the resistance of a body to a change in its motion
a force that maintains motion
the resultant force on a body

Practise

Practise: Dynamics · G3 Physics and O-Level Physics

A text-first Dynamics assessment with explicit bodies, force directions, masses, weights, drawing scales and motion descriptions.

About 10 minutes

Practise

Questions are selected when you start. Use the feedback to decide what to practise next; this does not prove mastery.

Recent attempts

History is stored only in this browser.

No completed attempts are saved yet.

This check needs JavaScript to record answers. The reviewed questions are listed below for study.

A tugboat moves at constant velocity while its engine provides 1200 N forward and water resistance is 1200 N backward. Which conclusion is correct?

The tugboat must be stationary because the forces balance.
The forward force is the resultant because the boat moves forward.
The resultant and acceleration are zero.
No forces act because its velocity is constant.

A swimmer pushes water backward. Which statement identifies the paired interaction force?

The water pushes the swimmer forward with an equal force.
The swimmer's weight acts downward with an equal force.
The water pushes itself forward.
Water resistance on the swimmer acts backward and cancels the push.

Which changes can a resultant force produce?

Only a change in position.
a change in speed, direction, or both
Only a change in speed.
Only a change in direction.

A 5.0 kg body accelerates at 2.4 m/s² left. Find the resultant force.

7.4 N left
12 N left
2.1 N left
12 N right

A stationary box is pushed gently but does not slide. What can friction do?

It is the box's weight.
It can balance the push while opposing the tendency to slide.
It must be zero because the box is stationary.
It acts in the direction of the push.

A block rests on a slope. In which direction does the normal force act?

perpendicular to the slope and away from it
vertically upward in every case
parallel to the slope
opposite to the block's weight

A toy car is pulled by a taut string while a nearby magnet repels a magnet fixed to the car. How should the two forces be classified?

Tension is contact; magnetic force is non-contact.
Tension is non-contact; magnetic force is contact.
Both forces are contact.
Both forces are non-contact.

A sealed 9.0 kg toolkit is moved from one shelf to another without adding or removing material. What is its mass after the move?

0 kg
Less than 9.0 kg because its position changed
9.0 kg because the amount of matter is unchanged
More than 9.0 kg because it travelled

No probe is currently placed at a point above Earth. Which statement about Earth's gravitational field at that point is correct?

The field still exists because Earth would exert force on a mass placed there.
The field exists only after a probe is placed there.
The field disappears whenever the point is empty.
The field is a force stored inside the probe.

A 3.0 kg instrument is where gravitational field strength is 4.0 N/kg. Which row correctly interprets the field strength and records its mass and weight?

4.0 N per kilogram; mass 3.0 kg; weight 12 N
0.25 N per kilogram; mass 3.0 kg; weight 0.75 N
4.0 N per kilogram; mass 3.0 N; weight 12 kg
4.0 N on every object; mass 3.0 kg; weight 4.0 N

A small test mass is placed to the right of an isolated planet. In which direction does the planet's gravitational field act at the test mass?

Towards the planet
Away from the planet
Vertically upward on the page
There is no direction because a field is not a force

A beam balance is level when sealed sample X is compared with standard masses totalling 650 g. What mass should be recorded for X?

650 g
325 g
1300 g
650 N

A falling sheet slows as it moves through air. Name and classify the upward force.

gravitational force, a contact force
normal force, a non-contact force
magnetic force, a non-contact force
air resistance, a contact force

Which two features must be stated when reporting an unknown force from a force triangle?

area and pressure
magnitude and direction
mass and volume
speed and time

Which of two bodies has greater inertia: 2 kg or 8 kg?

both have equal inertia
the faster body regardless of mass
the 8 kg body
the 2 kg body

Why does acceleration decrease as a falling body speeds up through air?

Air resistance increases, reducing the downward resultant force.
Weight decreases to zero.
Mass increases.
Air resistance acts downward.

Practise

Practise after feedback: Dynamics · G3 Physics and O-Level Physics

A text-first Dynamics assessment with explicit bodies, force directions, masses, weights, drawing scales and motion descriptions.

About 10 minutes

Practise

Questions are selected when you start. Use the feedback to decide what to practise next; this does not prove mastery.

Recent attempts

History is stored only in this browser.

No completed attempts are saved yet.

Check my progress

Check my progress: Dynamics · G3 Physics and O-Level Physics

A text-first Dynamics assessment with explicit bodies, force directions, masses, weights, drawing scales and motion descriptions.

About 10 minutes

Check my progress

Answer 15 questions. If accepted, this result can contribute to your course progress.

Recent attempts

History is stored only in this browser.

No completed attempts are saved yet.

Check again

Check again: Dynamics · G3 Physics and O-Level Physics

A text-first Dynamics assessment with explicit bodies, force directions, masses, weights, drawing scales and motion descriptions.

About 10 minutes

Check again

Answer 15 questions. If accepted, this result can contribute to your course progress.

Recent attempts

History is stored only in this browser.

No completed attempts are saved yet.

Review

Review: Dynamics · G3 Physics and O-Level Physics

A text-first Dynamics assessment with explicit bodies, force directions, masses, weights, drawing scales and motion descriptions.

About 10 minutes

Review

Answer 15 questions. A scheduled review can contribute to your course progress only when it is due and the result is accepted.

Recent attempts

History is stored only in this browser.

No completed attempts are saved yet.

Course and syllabus information

Course: SEC G3 Physics
Edition: SEC G3 Physics 2027

Check what I know: Dynamics · G3 Physics and O-Level Physics

Check what I know: Dynamics · G3 Physics and O-Level Physics

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