Laws of Motion Laws of Motion 1 / 10 If an object is in equilibrium, what can we conclude? Net force is zero It is moving It has acceleration It is at rest 2 / 10 What causes an object to resist changes in motion? Friction Mass Inertia Gravity 3 / 10 What happens to acceleration if mass increases, assuming constant force? Increases Decreases Remains the same Becomes zero 4 / 10 What type of motion is caused by unbalanced forces? Static motion Uniform motion Accelerated motion Rotational motion 5 / 10 What is the net force acting on an object in uniform motion? Greater than zero Equal to zero Less than zero None of the above 6 / 10 A 50 kg person stands on a weighing scale in an elevator accelerating upwards at 2 m/s². What does the scale read? 410 N 450 N 520 N 590 N Apparent weight = m(g+a) W=590N Apparent weight = m(g+a) W=590N 7 / 10 A 15 kg object slides on a horizontal surface with a frictional force of 45 N acting on it. What is the coefficient of friction (μ)? 0.2 0.3 0.4 0.5 Friction force Ff=μmg μ=Ff/mg=45/15×9.8=0.4 Friction force Ff=μmg μ=Ff/mg=45/15×9.8=0.4 8 / 10 A ball of mass 2 kg moving at 10 m/s collides with a wall and comes to rest in 0.2 s. What is the force exerted by the wall? 100 N 80 N 60 N 40 N 9 / 10 A 10 kg block is at rest on a horizontal surface. A horizontal force of 20 N is applied, and the block accelerates at 1 m/s². What is the frictional force? 10 N 15 N 20 N 25 N 10 / 10 A truck of mass 5000 kg is moving with a velocity of 20 m/s. What is the braking force needed to bring it to rest in 5 seconds? 10,000 N 20,000 N 50,000 N 40,000 N Your score is By WordPress Quiz plugin
