What is the magnitude of acceleration of falling objects on Earth?
9.8
An unfortunate bug splatters against the windshield of a moving car. Compared to the force of the car on the bug, the force of the bug on the car is _____________.
same
A racecar is doing laps around a circular track of radius 50 m. When the car has traveled halfway around the track, what is the car's displacement?
100 m
A football is kicked at an angle 35 degrees with respect to the horizontal. Which one of the following statements best describes the acceleration of the football during this event if air resistance is neglected? A)The acceleration is 0 m/s2 at all times. B)The acceleration is 9.8 m/s2 at all times. C)The acceleration is zero when the football has reached the highest point in its trajectory. D)The acceleration is positive as the football rises, and its is negative as the football falls. E)The acceleration starts at 9.8 m/s2 and drops to some constant lower value as the ball approaches the ground.
B)The acceleration is 9.8 m/s2 at all times.
A marble accelerates from rest at a constant rate and travels for a total displacement of 44 m in 20.0 s. What is the average velocity of the marble?
2.2 m/s
The law that states that every object maintains constant velocity unless acted on by an unbalanced force is
Newton's First Law
Two bullets are simultaneously fired from a gun and dropped from the same height. The bullet that is shot leaves the gun at 3200 m/s. Which bullet, the dropped or one fired from the gun, hit the ground first?
They hit the ground at the same time
A car travels a circular track with radius 100 m. If it goes around exactly one time, what is the displacement of the car?
0
A ball is dropped from a 70 m tall tower. How long will it take the ball to hit the ground?
3.78 s
Two individuals are on skateboards facing each other. John has a mass of 100 kg and pushes on Frank. If Frank has a 50 kg and accelerates away at 4 m/s after he is pushed, what is Johns acceleration?
2 m/s
A 40 N applied force is to an object experience 15 N of frictional force. If the object has a mass of 20 kg, what is the acceleration of the object?
1.25 m/s2
An object thrown horizontally from the top of a 25.00-m cliff lands a distance of 40.00 m away. What is the initial horizontal velocity?
17.7 m/s
A soccer ball is kicked horizontally. If its average speed is 2.63 m/s what is its displacement after 4.00 seconds?
10.52 m
A 3 kg box is pushed on a horizontal surface. It moves on the surface with an acceleration of 0.27 m/s2. Calculate the applied force that must be acting on the box.
0.81 N
An object with an initial velocity of 2.0 m/s undergoes a constant acceleration of 3.0 m/s2. What is the object's displacement after 4.0 s?
32 m
An arrow is shot horizontally from a height of 4.9 m above the ground. The initial speed of the arrow is 45 m/s. Neglecting friction, how long will it take the arrow to hit the ground?
1.0 s
A racecar has a speed of 80 m/s when the driver releases a drag parachute. If the parachute causes a deceleration of 4 m/s2, how far will the car travel before it stops?
800 m
Water drips from rest from a leaf that is 20 meters above the ground. Neglecting air resistance, what is the speed of each water drop when it hits the ground?
19.8 m/s
The coefficient of kinetic friction between a 25 kg crate and the floor is 0.45. How much force is required to keep the crate moving at a steady speed across the floor?
110.25 N
What is the equation for Newton's Law of Universal Gravitation?
FG = G * m1 * m2 /r2