1) What force is caused by gravity? a) mass b) weight c) downforce 2) What is the gravitational field strength of Earth? a) 9.8 N/kg b) 1.6 N/kg c) 25 N/kg 3) How is weight calculated a) weight = mass x gravitational field stength b) weight = gravitational field strength / mass c) weight = mass / gravitational field strength 4) What is the weight of a 40kg child on Earth? a) 40kg b) 4.1N c) 392 N 5) How is the object shown in a free body diagram? a) As a drawing of the object b) As a written description of the object c) As a box or dot 6) In which way does an arrow point in a free body diagram? a) Towards the object b) Away from the object c) In the direction of movement 7) What is a newton meter? a) A unit for speed b) A calibrated spring balance c) A unit for weight 8) Two 30N forces act on an object in opposite directions. Which statement is correct? a) The resultant force is 30 + 30 = 60N b) The resultant force is 30 - 30 = 0N c) The resultant force is 2 x 30 = 60N 9) How is work done calculated? a) work done = force x distance b) work done = distance / force c) work done = force / distance 10) How much work is done when a ball is moved 1.5m by a force of 12N? a) 8J b) 13.5J c) 18J

Gravity

由
打印
嵌入

排行榜

视觉风格

选项

切换模板

恢复自动保存：？