Application of Forces
The magnitude of the force exerted on or by a cable, rope, or string.
Tension
Which falls to the ground faster: a ball thrown horizontally or a ball dropped from the same height at the same time.
They reach the ground at the same time
Where must a geostationary satellite be located in relation to Earth?
Above the equator
What can you say about the potential difference across resistors connected in parallel?
Potential difference is the same
Explain, using physics, why curves on roads are often banked.
Reduces need for friction because Fnx contributes to Fc
Why is an object with uniform circular motion accelerating?
According to Newton’s law of universal gravitation, the force of attraction between any two masses is directly related to the ...
product of their masses
The electric field in a certain region of space is 40 N/C. What is the force on a 10 C charge placed in that region?
400 N
The path followed by a projectile.
Parabola
A 12.0 kg crate rests on a frictionless ramp that makes an angle of 25° with the horizontal. What is the normal force acting on the crate?
107 N
A ball with a 2.0 kg mass is on the end of a rope 3.0 m long. It is being swung in a horizontal circle at a frequency of 2 revolutions per second. What is the period of the ball’s motion
0.50 s
What is the speed of a 500 kg satellite orbiting the moon at distance of 2. 5 x 106 m from the moon’s centre?
1400 m/s
What is the resistance of a toaster that uses 2 A of current when connected to a 120-volt power source?
60 ohms
Ratio of frictional force and normal force between two surfaces
Coefficient of friction
Two masses, 4.0 kg and 7.0 kg, are connected by a light string that passes over a frictionless pulley. Determine the acceleration of the system.
2.7 m/s/s
How much centripetal force is needed to keep a 1645 kg car on the road when it makes a tight turn around a corner with a turning radius of 15 m going at a speed of 45 km/h?
17 100 N
Tom has a mass of 70.0 kg and Sally has a mass of 50.0 kg. Tom and Sally are standing 20.0 m apart on the dance floor. Sally looks up and sees him. She feels an attraction. What is the gravitational force between them?
5.84 x 10-10 N
The electrostatic force between two objects is 80.0 N. What would the force become if the mass of one object was halved and the distance between the two objects was doubled?
10.0 N
A child sits on a seesaw 1.5 m from the pivot. A second child sits on the opposite side. Child A has a mass of 30 kg and sits 1.5 m from the pivot. Child B sits 1.0 m from the pivot. Determine the mass of Child B needed to keep the seesaw balanced.
45 kg
A 15 g bullet is shot into a 5085 g wooden block standing on a frictionless surface. The block, with bullet in it, acquires a velocity of 1.0 m/s. Calculate the velocity of the bullet before striking the block.
340 m/s
A soccer ball is kicked from ground level with an initial speed of 18.0 m/s at an angle of 35° above the horizontal. Calculate the range of the ball.
31 m
Find the equivalent resistance of a circuit if R1 connected in parallel with R2 and these are then connected in series with R3. (20 V battery, R1 = 3.0 Ω, R2 = 7.0 Ω, R3 = 10.0 Ω).
12.1 ohms