Year 10 Science – Forces 1
Practise analysing net force and energy, weight on different bodies, orbits, magnets and electromagnets, and the force–distance trade-off of simple machines. 20 questions. 25 minutes.
A magnet lifts a steel nail across a 2 cm air gap. What would happen if the air were pumped out of the gap?
Which design is intended to reduce friction rather than increase it?
Circle 2 words in the sentence below.
A cricket ball is flying through the air after leaving the bat. Click the two forces acting on it.
the bat's pushgravityfriction with the pitchair resistance
Choose the word that completes each blank.
A wrench with a long handle makes a bolt easier to turn because the effort arm is 1, so 2 effort force is needed.
Blank 1: shorter · longer · thicker
Blank 2: more · the same · less
A student pulls a block at a steady speed across three surfaces, three trials each, and records the spring balance readings. Which conclusion is supported?
| Surface | Trial 1 | Trial 2 | Trial 3 |
|---|---|---|---|
| Tiles | 4.1 | 4.0 | 4.2 |
| Lino | 5.0 | 5.1 | 4.9 |
| Carpet | 7.9 | 8.1 | 8.0 |
A car travels at a steady speed along a straight road. The driving force is 2400 N, and air resistance is 1500 N. What is the rolling friction on the tyres?
Choose the word or phrase that completes each blank.
A probe coasting through deep space at constant speed with its engine off has a net force that is 1. Firing its engine against its direction of motion makes it 2.
Blank 1: zero · equal to its weight · small and forward
Blank 2: speed up · slow down · stop at once
A plotting compass is placed near the south pole of a bar magnet. Which part of the compass needle points towards the magnet?
Choose the word that completes each blank.
A steel bar is attracted to a magnet's pole, but attraction alone 1 prove the bar is a magnet. Only 2 proves it.
Blank 1: cannot · can · always will
Blank 2: attraction · weight · repulsion
Two identical trolleys start from rest. Trolley A has a net force of 6 N to the right and trolley B has a net force of 3 N to the right. After 2 s, which statement is correct?
Circle 2 words in the sentence below.
A wheelbarrow is used to carry soil. Click the two simple machines it combines.
pulleywheel and axlewedgelever
Choose the word that completes each blank.
Repeating a friction measurement three times and averaging reduces 1 error. The block must be pulled at a 2 speed so the spring balance reading equals friction.
Blank 1: systematic · random · rounding
Blank 2: steady · increasing · maximum
Three electromagnets are tested. Which pair of electromagnets isolates the effect of the core material?
| Electromagnet | Turns | Core | Cells | Clips lifted |
|---|---|---|---|---|
| A | 50 | Iron nail | 1 | 8 |
| B | 50 | Iron nail | 3 | 20 |
| C | 50 | Wooden dowel | 3 | 0 |
A worker pushes a crate 6 m across a concrete floor at a steady speed. Friction on the crate is 40 N. How much energy does the worker transfer to the crate, ending up as heat and sound?
Choose the word that completes each blank.
A woomera acts as a 1. Because the spear's end moves along a longer path than the hand, the spear leaves with greater 2.
Blank 1: pulley · inclined plane · lever
Blank 2: mass · speed · weight
A satellite moves in a circle around Earth at constant speed. Its direction changes continually. What does this tell you about the net force on it?
A probe weighs 150 N on Mars, where g = 3.75 N/kg. What is the probe's mass?
Choose the number that completes each blank.
On a certain planet a 4 kg block weighs 28 N, so g is 1 N/kg there. A 10 kg block on that planet would weigh 2 N.
Blank 1: 112 · 0.14 · 7
Blank 2: 70 · 28 · 700
A pulley system with a mechanical advantage of 4 lifts a load 2 m. Ignoring friction, how far must the rope be pulled?
Circle 1 word in the sentence below.
A weather satellite moves in a steady orbit with its engines off. Click the one force that keeps it in orbit.
thrustgravityfrictionmagnetism