1:An object that’s moving with constant speed travels once around a circular path.True statements about this motion include which of the following?
2:Which of the following must always be true? 1.If an object’s acceleration is constant,then it must move in a straight line 2.If an object’s acceleration is zero,then its speed must remain constant 3.If an object’s speed remains constant,then its acceleration must be zero.
3:A frictionless inclined plane of length 20m has a maximum vertical height of 5m. If an object of mass 2 kg is planced on the plame . Which of the following best approximates the net force it feels?
4:A person who weighs 800N steps onto a scale that is on the floor of an elevator car. If the elevator accelerates upward at a rate of 5 m/s2, what will the scale read?
5:A person standing on a horizontal floor feels two forces: the downward pull of gravity and the upward supporting force from the floor. There two forces
6:How long would it take a car,starting from rest and accelerating uniformly in a straight line at 5m/s2,to cover a distance of 200m?
7:A rock is dropped off a cliff and strikes the ground with an impact velocity of 30m/s.How high was the cliff?
8:A soccer ball at rest on the ground,is kicked with an initial velocity of 10m/s at a launch angle of 300.Calculate its total flight time , assuming that air resistance is negligible.
9:If all of the forces acting on an object balance so that the net force is zero , then
10:The coefficient of static friction between a box and a ramp is 0.5. The ramp’s incline angle is 300.If the box is placed at rest on the ramp, box will