Natural Science · 4.º de Primaria · Con las respuestas
Unit 5: We explore forces and machines
El modelo A con la respuesta de cada pregunta debajo, para corregirlo en casa o ver dónde estaba cada cosa.
NombreFechaNota4.º de Primaria · Natural Science · Unit 5: We explore forces and machines · Modelo A
1
Forces
3 puntosA force is…
Respuesta: a push or a pull
What does the force do to the object?
You kick a ball that isn't moving. The force can…( move it · stop it · change its shape · change its direction )
Respuesta: move it
A goalkeeper catches the ball. The force can…( move it · stop it · change its shape · change its direction )
Respuesta: stop it
You squeeze some plasticine. The force can…( move it · stop it · change its shape · change its direction )
Respuesta: change its shape
A tennis player hits the ball back. The force can…( move it · stop it · change its shape · change its direction )
Respuesta: change its direction
2
Energy
2 puntosA torch changes electrical energy into…
Respuesta: light energy
The energy that moving things have is…
Respuesta: kinetic energy
The Sun is our main source of energy.( True · False )
Respuesta: True
3
Simple machines
3 puntosA see-saw in the park is…( a lever · a pulley · an inclined plane · a wheel and axle )
Respuesta: a lever
A ramp to push a wheelchair up is…( a lever · a pulley · an inclined plane · a wheel and axle )
Respuesta: an inclined plane
A wheel and a rope to lift a bucket from a well is…( a lever · a pulley · an inclined plane · a wheel and axle )
Respuesta: a pulley
The wheels of a cart turning on a bar are…( a lever · a pulley · an inclined plane · a wheel and axle )
Respuesta: a wheel and axle
A bicycle is a…
Respuesta: complex machine
4
Inventions
2 puntosWhich invention changed communication the most?
Respuesta: the telephone
Inventions can have good and bad effects, like cars: fast travel, but pollution.( True · False )
Respuesta: True
+
Challenge
No cuenta para la notaThis one doesn't count for your mark. It's for champions!
Why is it easier to push a box up a ramp than to lift it?
Respuesta: the ramp spreads the effort over a longer distance