Starter quiz
- When one object pushes or pulls on another object, what do we call the push or pull?
- force ✓
- energy
- power
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- A force is always a ______ or a pull.
- 'push' ✓
- If they were thrown at the same speed, would a tennis ball (60 g) or a cricket ball (160 g) be harder to stop?
- the tennis ball
- the cricket ball ✓
- they would be equally hard to stop
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- Which one of these is a force?
- a waterfall
- electric current
- a car's engine
- the push of your hand on a door ✓
- the movement of a rolling ball
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- Forces make things change. Which of the following statements are true?
- Forces can change an object's shape. ✓
- Forces can change the direction of an object's motion. ✓
- Forces can change the material an object is made of.
- Forces can change the speed of an object. ✓
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Which of the following forces act on the moving speedboat? The speedboat is driving forwards.- A gravitational force (a downwards pull from Earth). ✓
- An upthrust force (an upwards push from the water). ✓
- Air resistance (a backwards force from the air as the boat moves through it). ✓
- Drag (a backwards force from the water, sometimes called 'water resistance'). ✓
- A forwards force caused by the boat's motor. ✓
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Exit quiz
- The speed of an object can only be changed if a ______ acts.
- 'force' ✓
- Which answer gives the best summary of what friction does?
- Friction provides motion.
- Friction opposes motion. ✓
- Friction make things change.
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- Which is the best definition of what a force is?
- A force is a push or a pull from another object. ✓
- A force is what moving objects have.
- A force is the energy an object has.
- A force is the power of an object.
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- Which would need the greatest force to stop it?
- a 3 g table-tennis ball at a speed of 10 m/s
- a 60 g tennis ball at a speed of 2 m/s
- a 160 g apple at a speed of 2 m/s
- a 160 g cricket ball at a speed of 10 m/s
- a 450 g football at a speed of 10 m/s ✓
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Which is the best way of describing the force represented by the arrow?- the hand's force
- the balloon's force
- the force of the hand on the balloon ✓
- the force between the hand and the balloon
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The path of a golf ball is shown. It was struck with a golf club but then blown off course by the wind. Sophia suggests using a heavier golf ball would help. Identify the false statement.- A heavier ball, hit with the same speed, would be more difficult to stop.
- A heavier ball would need a greater force from the club to reach the same speed.
- A heavier ball would change direction more, under the same force from the wind. ✓
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Worksheet
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Presentation
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Video
Lesson Details
Key learning points
- The motion of faster objects is harder to stop.
- The motion of heavier objects is harder to stop.
- Objects with a greater mass need a greater force to start or stop it moving, and to change the direction of motion.
- A force is a push or a pull.
- A force is needed to change the motion or shape of an object.
Common misconception
A moving object has force that keeps it moving, and which runs out when it comes to rest.
Forces come from other objects. Forces change the motion of objects. Objects slow when forces act opposite to the direction of motion.
Keywords
Force - Forces are the pushes and pulls that objects exert on each other.
Exert - We say that objects exert forces on other objects.
Speed - The speed of an object is how fast it is going.
Mass - The mass of an object can be thought of as the amount of material making up the object.
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