Lesson T2.3.2
T2.3.2 Forces and changes in motion Quiz: KS3 Physics, Unit 2
20 questions
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Lesson T2.3.2, Forces and changes in motion: 20 multiple choice questions for the KS3 Physics (National Curriculum), Unit 2: Motion and forces, written with Revision Ninja.
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The 20 questions
-
What must act on a stationary object for it to start moving?
- Unbalanced force
- Magnetic field
- Zero force
- Balanced force
-
Forces can change an object's motion by changing its speed or what else?
- Direction
- Mass
- Density
- Temperature
-
Which force slows down a bicycle when the brakes are applied?
- Magnetism
- Gravity
- Friction
- Upthrust
-
Why does a parachutist fall at a steady speed?
- Maximum acceleration
- Zero gravity
- Unbalanced forces
- Balanced forces
-
Which force slows down a football kicked along grass?
- Tension
- Friction
- Upthrust
- Gravity
-
What two properties must a force have because it is a vector quantity?
- Speed and mass
- Size and weight
- Mass and direction
- Size and direction
-
A trolley has a 10 N right force and 4 N left friction. What happens?
- Stays constant
- Slows down
- Speeds up left
- Speeds up right
-
What resistive force acts on an object moving through water?
- Thrust
- Tension
- Drag
- Gravity
-
What force makes it harder to ride a bicycle into a strong headwind?
- Air resistance
- Magnetic force
- Upthrust
- Gravitational force
-
Why does a falling object reach a steady terminal speed?
- Air resistance balances weight
- Mass decreases over time
- Air resistance exceeds weight
- Gravity becomes zero
-
What name is given to the contact force that opposes relative motion between surfaces?
- Gravity
- Friction
- Pressure
- Magnetism
-
What term describes a force combination where the resultant force is not zero?
- Balanced force
- Static force
- Unbalanced force
- Neutral force
-
What is required to change the direction of a moving ball?
- Constant speed
- A balanced force
- Zero friction
- An unbalanced force
-
Which shape is used on cars and boats to reduce fluid resistance?
- Cubic
- Spherical
- Pyramidal
- Streamlined
-
Two forces of 15 N and 9 N act in opposite directions. What is the resultant force?
- 24 N
- 135 N
- 90 N
- 6 N
-
Which action demonstrates a force changing an object's shape rather than its motion?
- Rolling a ball
- Squeezing a ball
- Dropping a ball
- Catching a ball
-
What force pushes a swimmer forward when they push water backwards?
- Reaction force
- Frictional drag
- Gravitational force
- Magnetic force
-
A moving trolley has a 20 N push and 12 N friction against it. What happens?
- Constant speed
- Speeds up
- Slows down
- Stops moving
-
What is always required to change an object's velocity?
- Constant mass
- Equal speed
- Zero friction
- A resultant force
-
Why does a faster car need a greater braking force?
- Less friction
- More momentum
- Stronger gravity
- Lower mass
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