Speed and forces

Worksheet: Speed and forces

Name:Class:

Answer the questions.

1. Which formula gives speed?
   a) distance + timeb) distance × timec) distance ÷ timed) time ÷ distance
2. A cyclist rides 60 km in 3 hours at a steady pace. What is her speed?
   a) 180 km/hb) 20 km/hc) 57 km/hd) 63 km/h
3. A car travels 150 metres in 10 seconds. What is its speed in m/s?
4. A train moves at a steady 20 m/s. How long does it take to travel 300 m?
   a) 15 sb) 280 sc) 320 sd) 6000 s
5. When two forces on an object are equal and opposite, we say they are...
   a) balancedb) frictionc) strongerd) unbalanced
6. An unbalanced force can make a moving object speed up, slow down or change direction.
   a) Trueb) False
7. A book rests on a table and does not move. What can you say about the forces on it?
   a) Only one force acts on itb) There are no forcesc) They are balancedd) They are unbalanced
8. Which force slows a sliding box as its bottom rubs along the floor?
   a) frictionb) gravityc) magnetismd) upthrust
9. Which change would reduce friction between two surfaces?
   a) Adding oilb) Adding sandpaperc) Making them rougherd) Pressing them together harder
10. Air resistance acts on a falling parachutist and slows the fall.
    a) Trueb) False
11. What is the name of the force that pulls objects towards the Earth?
12. About how many newtons is the weight of a 1 kg mass on Earth?
13. An astronaut's mass changes when she travels from Earth to the Moon.
    a) Trueb) False
14. What is the unit of force?
    a) jouleb) kilogramc) metred) newton
15. Which instrument is used to measure a force?
    a) measuring cylinderb) newton meterc) stopwatchd) thermometer
16. On the Moon, an object's weight is smaller than on Earth because the Moon's...
    a) air is thickerb) friction is greaterc) gravity is weakerd) mass is larger